#
b0b6c16b |
| 13-May-2024 |
Michael Kruse <llvm-project@meinersbur.de> |
[Clang][OpenMP][Tile] Allow non-constant tile sizes. (#91345)
Allow non-constants in the `sizes` clause such as
```
#pragma omp tile sizes(a)
for (int i = 0; i < n; ++i)
```
This is permitted s
[Clang][OpenMP][Tile] Allow non-constant tile sizes. (#91345)
Allow non-constants in the `sizes` clause such as
```
#pragma omp tile sizes(a)
for (int i = 0; i < n; ++i)
```
This is permitted since tile was introduced in [OpenMP
5.1](https://www.openmp.org/spec-html/5.1/openmpsu53.html#x78-860002.11.9).
It is possible to sneak-in negative numbers at runtime as in
```
int a = -1;
#pragma omp tile sizes(a)
```
Even though it is not well-formed, it should still result in every loop
iteration to be executed exactly once, an invariant of the tile
construct that we should ensure. `ParseOpenMPExprListClause` is
extracted-out to be reused by the `permutation` clause of the
`interchange` construct. Some care was put into ensuring correct behavior
in template contexts.
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