又仔细测试了一下 代码如下

>>> from time import sleep, ticks_us as ticks
run_times=1
def test1():
    t1=ticks()
    for i in range(run_times):
        x1=0
        x2=1
        x3=1
        x4=0
        if x1!=x2 and x1!=x3:
            x1=x3
            x4=x4+1
    t2=ticks()
    print(t2-t1)
def test2():
    t1=ticks()
    for i in range(run_times):
        x1=0
        x2=1
        x3=1
        x4=0
        q=(x1^x2)&(x1^x3)
        x1=x1^q
        x4=x4+q
    t2=ticks()
    print(t2-t1)
sleep(1)
test1()
sleep(1)
test2()

32
15
>>> from time import sleep, ticks_cpu as ticks
run_times=1
def test1():
    t1=ticks()
    for i in range(run_times):
        x1=0
        x2=1
        x3=1
        x4=0
        if x1!=x2 and x1!=x3:
            x1=x3
            x4=x4+1
    t2=ticks()
    print(t2-t1)
def test2():
    t1=ticks()
    for i in range(run_times):
        x1=0
        x2=1
        x3=1
        x4=0
        q=(x1^x2)&(x1^x3)
        x1=x1^q
        x4=x4+q
    t2=ticks()
    print(t2-t1)
sleep(1)
test1()
sleep(1)
test2()

5010
2246
>>> from time import sleep, ticks_cpu as ticks
run_times=10
def test1():
    t1=ticks()
    for i in range(run_times):
        x1=0
        x2=1
        x3=1
        x4=0
        if x1!=x2 and x1!=x3:
            x1=x3
            x4=x4+1
    t2=ticks()
    print(t2-t1)
def test2():
    t1=ticks()
    for i in range(run_times):
        x1=0
        x2=1
        x3=1
        x4=0
        q=(x1^x2)&(x1^x3)
        x1=x1^q
        x4=x4+q
    t2=ticks()
    print(t2-t1)
sleep(1)
test1()
sleep(1)
test2()

16096
12813
>>> from time import sleep, ticks_cpu as ticks
run_times=100
def test1():
    t1=ticks()
    for i in range(run_times):
        x1=0
        x2=1
        x3=1
        x4=0
        if x1!=x2 and x1!=x3:
            x1=x3
            x4=x4+1
    t2=ticks()
    print(t2-t1)
def test2():
    t1=ticks()
    for i in range(run_times):
        x1=0
        x2=1
        x3=1
        x4=0
        q=(x1^x2)&(x1^x3)
        x1=x1^q
        x4=x4+q
    t2=ticks()
    print(t2-t1)
sleep(1)
test1()
sleep(1)
test2()

126486
119600
>>>

循环次数增加  感觉逐渐拉平

在电脑上 使用time_ns代替ticks_xxx 循环100000次  是37:64 (ms) 是if判断更快

另外一个测试 这里难以完全描述 是在整个系统里的实际应用临时增加一个计时  对运行时间进行累加和平均 使用if判断又反而比运算法来得快 大概耗时比是94:116

最终决定 还是用回if法