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【x86向量化】三种不同方式的AGC算法代码运行速度对比
warmonkey2019/01/01软件综合 IP:广东

前言

在使用通用处理器如x86-64开发软件无线电算法的过程中，充分利用cpu的simd指令集（mmx/sse/avx/neon等）对于性能是至关重要的。现代的x86-64处理器能够支持很大的浮点向量运算，例如intel haswell（2011年发布）平台支持的avx指令集，ymm 0 ~ ymm15寄存器宽度为256bit，每条指令能实现8个单精度浮点数乘法或加法，4GHz主频运行linpack实测速度可达100Gflops。

AGC（自动增益控制）是软件无线电处理中最基本的算法之一。其目的是保持输出信号幅度基本稳定，以方便后续算法处理。AGC算法的工作流程可以总结为三步：

1. 放大信号。乘法运算，调整信号的幅度；

2. 检测信号幅度。对输出信号使用功率检波或者有效值检波，测量信号的实际幅度；

3. 调整增益。比较设定值与实际幅度的偏差，据此调整增益设置。

为了能够尽可能充分利用处理器的运算能力，编译器会对代码进行自动向量化，将多个浮点操作打包在一起，生成simd指令。因此，编写合适的代码结构对于性能是至关重要的。本文将对3种不同结构的AGC算法代码进行性能对比测试，以找出最优的方案。

算法实现方案

其中x y为float complex，pwr reference gain为float，全部对齐到16字节地址

<code class="hljs glsl"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">for</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(i=<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">0</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>;i<n;i++) { step1: y="gain" * x; <span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//MUL=2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
    step2: pwr = y.re * y.re + y.im * y.im;   <span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//MUL=2 ADD=1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
}
step3: <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">if</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(pwr > reference) gain *= <span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">0.99</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>; <br>       <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">else</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> gain *= <span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1.01</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>;  <span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//CMP=1 MUL=1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></n;i++)></span></code>

Total FLOPS = n * 5 + 2;

根据gcc编译器自动向量化的说明 （XXXXXXXXXXXXXXXXXXX/projects/tree-ssa/XXXXXXXXXXXXXXXXml） 编写了相应的测试代码。

其中算法1使用libvolk（）库的avx2实现，算法2和算法3使用c语言编写

<code class="hljs bash">//算法1<br><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">for</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> (i=0; i<*_num_iterations; i++) {   volk_32<span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in">fc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>_s32<span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in">fc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>_multiply_32<span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in">fc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y, x, gain, n);
    volk_32<span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in">fc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>_magnitude_squared_32f(pwry, y, n);
    *pwr = 0;<br>    volk_32f_accumulator_s32f(pwr, pwry, n);
    *pwr /= n;
    <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">if</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(*pwr > d_reference) gain *= a1;
    <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">else</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> gain *= a2;<br>}</*_num_iterations;></span></code>
<code class="hljs verilog"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//算法2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-comment"><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">*pwr = 0;</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">for</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">int</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> i = <span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">0</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>; i < n; i++)
{
    y[i] = x[i] * gain;<span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//step1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
    pwry[i] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i]) + imag(y[i])*imag(y[i]);<span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//step2.1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
}
<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">for</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">int</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> i = <span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">0</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>; i < n; i++)
{
    *pwr += pwry[i];<span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//step2.2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
}
*pwr /= n;
<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">if</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(*pwr > d_reference) gain *= a1;
<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">else</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> gain *= a2;<br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//备注：经过测试, step1和step2.1放在同个循环，step2.2放在另外的循环中，速度最快。</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//step1 2.1 2.2分开三个循环，或者step1 2.1 2.2放在一起，或者step1分开step2.1 2.2放在一起，速度都会减慢</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//不使用pwry中间变量，直接累加到pwr，速度也会减慢</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br></span></code>
<code class="hljs verilog"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//算法3，手动展开循环，其中n是8的倍数</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">*pwr = 0;</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">for</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">int</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> i = <span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">0</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>; i < n; i+=<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">8</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>)
{
    y[i] = x[i] * gain;
    pwry[i] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i]) + imag(y[i])*imag(y[i]);
    y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = x[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] * gain;
    pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]) + imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]);
    y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = x[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] * gain;
    pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]) + imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]);
    y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = x[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] * gain;
    pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]) + imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]);
    y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = x[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] * gain;
    pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]) + imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]);
    y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">5</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = x[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">5</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] * gain;
    pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">5</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">5</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">5</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]) + imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">5</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">5</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]);
    y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">6</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = x[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">6</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] * gain;
    pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">6</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">6</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">6</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]) + imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">6</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">6</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]);
    y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = x[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] * gain;
    pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] = <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">real</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]) + imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>])*imag(y[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]);
}
<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">for</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">int</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> i = <span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">0</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>; i < n; i+=<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">8</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>)
{
    *pwr += pwry[i]    + pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] + pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] + pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] 
          + pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>]  + pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">5</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] + pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">6</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>] + pwry[i+<span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>];
}
*pwr /= n;
<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">if</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>(*pwr > d_reference) gain *= a1;
<span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">else</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> gain *= a2;</code>

以上测试代码分别循环iter次，其中iter=256*1048576/n，即测试的数据总长度不变。

使用getrusage函数得到循环的执行时间，进而计算出每秒处理的数据个数。

编译时，算法2和3均成功向量化

<code class="hljs less">gcc 7<span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.4</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.0</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//算法2</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">agc_gr_bench.cc:105:20: note: loop vectorized</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:105</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:20</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">versioned</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">for</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">vectorization</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">because</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">of</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">possible</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">aliasing</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:105</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:20</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">turned</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">into</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">non-loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>; it never loops.
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:105</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:20</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">with</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">iterations</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">completely</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">unrolled</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:110</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:20</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">unrolled</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">7</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">times</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:105</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:20</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">unrolled</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">times</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:108</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:12</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">unrolled</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">times</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//算法3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">agc_gr_bench.cc:139:20: note: loop vectorized</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:139</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:20</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">versioned</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">for</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">vectorization</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">because</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">of</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">possible</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">aliasing</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:159</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:20</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">unrolled</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">3</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">times</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
<span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">agc_gr_bench</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class"><span class="hljs-selector-class">.cc</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:142</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo"><span class="hljs-selector-pseudo">:12</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">note</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">loop</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">unrolled</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">1</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> <span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag"><span class="hljs-selector-tag">times</span></span></span></span></span></span></span></span></span></span></span><br></span></span></span></span></code>

备注: 作为对比，导入了gnuradio feed_forward_agc中的快速开平方拟合算法, 仅执行检波算法

<code class="hljs cpp"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//算法: agc_gr </span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">//测试方法：循环执行该函数iter*n次 </span></span></span></span></span></span></span></span></span></span><br><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-comment">inline static float envelope(gr_complex x)</span></span></span></span></span></span></span></span></span></span>
{
    <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">float</span></span></span></span></span></span></span></span></span></span> r_abs = <span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in">std</span></span></span></span></span></span></span></span></span></span>::<span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in">fabs</span></span></span></span></span></span></span></span></span></span>(x.real());
    <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">float</span></span></span></span></span></span></span></span></span></span> i_abs = <span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in">std</span></span></span></span></span></span></span></span></span></span>::<span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in"><span class="hljs-built_in">fabs</span></span></span></span></span></span></span></span></span></span>(x.imag());

    <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">if</span></span></span></span></span></span></span></span></span></span>(r_abs > i_abs)
        <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">return</span></span></span></span></span></span></span></span></span></span> r_abs + <span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">0.4</span></span></span></span></span></span></span></span></span></span> * i_abs;
    <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">else</span></span></span></span></span></span></span></span></span></span>
        <span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword"><span class="hljs-keyword">return</span></span></span></span></span></span></span></span></span></span> i_abs + <span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number"><span class="hljs-number">0.4</span></span></span></span></span></span></span></span></span></span> * r_abs;
}</code>

测试环境

i7-4770k 2.6GHz

DDR3 2400 8GB

ubuntu 16.04 LTS

gcc 7.4.0 （备注: gcc 5.4.0速度减少10-15%，clang 3.8速度减少50%）

libvolk 1.4 (备注：未使用volk_modtool生成配置文件，使用默认的算法选择逻辑。)

存在问题：使用过volk_modtool之后最高可损失40%性能，架构选择a_sse3 u_sse3 a_avx u_avx均有此问题，原因不明。

测试结果

bench.png

 volk库速度最快，在向量长度n=1024时，处理速率1.75Gsps；

其次是手动展开循环的c代码（算法3），n=32时，处理速率1.24Gsps；

最慢的是简单循环（算法2），n=16时，处理速率0.85Gsps；

总结

若算法允许每次迭代处理多个数据（n值较大），应该优先使用libvolk库。

若算法要求迭代周期尽可能短（小的n值），应该用c语言自行编写展开的循环。

保持n值不要太大（使得数据能放入L1或L2缓存），否则性能会快速下降

源代码

attachment icon agc_bench.tar.gz 31.88KB GZ 66次下载

[修改于 5年11个月前 - 2019/01/03 17:57:01]

来自：计算机科学 / 软件综合
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薛定谔的猫
5年11个月前 IP:陕西
853360
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SDR的算法有并行化加速的空间吗

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风雨不眠隔夜的你
5年11个月前 IP:四川
853365
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现在正在学编代码的同学前来膜拜。

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