| Issue |
100864
|
| Summary |
[LoopIdiomRecognize] Only optimization for initialize zero
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
vfdff
|
* test: https://gcc.godbolt.org/z/zo3b9rMdj
```
void foo_memset0 (float dest[N], int n)
{
// #pragma clang loop vectorize(assume_safety)
for (int k=0; k<10; k++)
for (int j = 0; j < n; j++) {
dest[j] = 0;
}
}
void foo_memset1 (float * __restrict dest, float * __restrict src, int n)
{
// #pragma clang loop vectorize(assume_safety)
for (int k=0; k<10; k++)
for (int j = 0; j < n; j++) {
dest[j] = 1;
}
}
```
* We can see that there is obvious different output assembles between the initialize zero and initialize One.
> For initialize zero, it is recognized as a memset , and then eliminate the out loop
![]()
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
