英特尔的pragma simd与OpenMP的pragma omp simd [英] Intel's pragma simd vs OpenMP's pragma omp simd

问题描述

英特尔编译器允许我们通过以下方式对循环进行矢量化处理

The Intel compiler allows us to vectorize loops via

#pragma simd
for ( ... )

但是，您也可以选择使用OpenMP 4的指令执行此操作:

However, you also have the option to do this with OpenMP 4's directive:

#pragma omp simd
for ( ... )

两者之间有区别吗?

推荐答案

出于所有意图和目的，它们应该相同.区别在于OpenMP 4.0 #pragma omp simd指令是可移植的，并且可以与其他支持OpenMP 4.0以及Intel的编译器一起使用.

For all intents and purposes they should be identical. The difference is that the OpenMP 4.0 #pragma omp simd directive is portable and should work with other compilers that support OpenMP 4.0 as well as Intel's.

此外，OpenMP版本中有几个子句，可让您以更可靠的方式对指令进行矢量化(想到了safelen()，linear()，aligned()，reduction()和collapse()).

Furthemore, there are several clauses in the OpenMP version which allow you to vectorize instructions in a more robust manner (safelen(), linear(), aligned(), reduction(), and collapse() come to mind).

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