什么是量化呢？ [英] What does vectorization mean?

问题描述

这是个好主意，矢量化code？什么是在什么时候做方面的良好做法？下面会发​​生什么？

Is it a good idea to vectorize the code? What are good practices in terms of when to do it? What happens underneath?

推荐答案

矢量意味着编译器检测到您的独立指令​​为一体的 SIMD指令。通常的例子是，如果你做类似

Vectorization means that the compiler detects that your independent instructions can be executed as one SIMD instruction. Usual example is that if you do something like

for(i=0; i<N; i++){
  a[i] = a[i] + b[i];
}

这将作为矢量（使用矢量标记）

It will be vectorized as (using vector notation)

for (i=0; i<(N-N%VF); i+=VF){
  a[i:i+VF] = a[i:i+VF] + b[i:i+VF];
}

基本上编译挑选一人操作，可以对数组的元素VF在同一时间进行，这是否N / VF倍，而不是做单一的操作N次。

Basically the compiler picks one operation that can be done on VF elements of the array at the same time and does this N/VF times instead of doing the single operation N times.

这提高了性能，但穿上体系结构的详细要求。

It increases performance, but puts more requirement on the architecture.

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