我无法弄清楚为什么Visual C无法自动矢量化这个循环…任何想法？
我明白了：
testvec.cpp:12: info C5002: loop not vectorized due to reason '1200'
原因代码1200是：
Loop contains loop-carried data dependences that prevent vectorization. Different iterations of the loop interfere with each other such that vectorizing the loop would produce wrong answers,and the auto-vectorizer cannot prove to itself that there are no such data dependences.
但为什么？
#include <stdlib.h>
int main(int argc,char *argv[])
{
int const n = argc;
double
*const p1 = (double *)malloc(n * n * sizeof(*p1)),*const p2 = (double *)malloc(n * n * sizeof(*p2));
for (int j = 0; j < n; ++j)
{
double const sj = p1[n * j];
for (int i = 0; i < n; ++i)
{
double const sum = p1[i] + sj,old = p1[i + n * j];
p2[i + n * j] = sum < old ? sum : old;
}
}
}
解决方法
原文地址：https://www.jb51.cc/c/117980.html
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。
