| Issue |
115595
|
| Summary |
Unable to vectorize loop with connectivity table on result index
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
bemichel
|
Hi,
I try to find if there is already an issue on the subject, but I did not find any.
I work on loop like this (https://godbolt.org/z/fchd4e54e), where the final index on the result array `y` is given by the integer table `face_cell` :
```c++
void compute_local_extrema(
const int nface,
const int ncell,
const int* __restrict face_cell,
const double* __restrict x,
double* __restrict y) {
int il, ir;
#pragma clang loop distribute(enable) vectorize(enable) interleave(enable)
for (int iface=0; iface<nface; ++iface) {
il = face_cell[iface];
ir = face_cell[iface+nface];
y[il] = std::max(y[il], x[ir]);
}
}
```
It seems that the auto-vectorize does not work on the kind of loop, despite the fact that it seems working on GCC (https://godbolt.org/z/944q8M6T1 from 12.2 to 13.3).
Is there a way to finally vectorize this kind of loop ?
If it is possible, can you give me some advices on how to do this?
Thanks a lot for your help.
Bertrand M.
![]()
_______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
