为什么必须在循环变量中并行签名？ [英] Why must loop variables be signed in a parallel for?

问题描述

我只是从在线教程和资源学习OpenMP。我想使用 parallel for 循环来平方一个矩阵（乘以它自己）。在 IBM编译器文档，我发现迭代变量必须是签名的整数的要求。这在GCC实现中也是如此吗？是否在OpenMP标准中指定？

I'm just learning OpenMP from online tutorials and resources. I want to square a matrix (multiply it with itself) using a parallel for loop. In IBM compiler documentation, I found the requirement that "the iteration variable must be a signed integer." Is this also true in the GCC implementation? Is it specified in the OpenMP standard? If so, is there a reason for this requirement?

（无关紧要，因为预期的尺寸远远小于 INT_MAX code>，但它确实需要我一些cast。）

(It doesn't matter much as the expected dimensions are far smaller than INT_MAX, but it does cost me some casts.)

推荐答案

根据OpenMP 3.0规范：http://www.openmp.org/mp-documents/spec30.pdf ，变量可以是签名或无符号整数类型，请参见2.5.1循环构造。问题是OpenMP实现是否符合最新规范。

According to OpenMP 3.0 specification: http://www.openmp.org/mp-documents/spec30.pdf, for variable may be of a signed or unsigned integer type, see 2.5.1 Loop Construct. The question is whether given OpenMP implementation matches this latest specification.

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