llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
Author: Jon Chesterfield (JonChesterfield)
<details>
<summary>Changes</summary>
Problem identified by Joseph. The openmp device runtime uses
__scoped_atomic_load_n and similar which presently hit
```
error: large atomic operation may incur significant performance
penalty; the access size (4 bytes) exceeds the max lock-free size (0
bytes) [-Werror,-Watomic-alignment]
```
This is because the spirv class doesn't set the corresponding field. The base
does, but only if there's a host toolchain, which there isn't.
---
Full diff: https://github.com/llvm/llvm-project/pull/128569.diff
1 Files Affected:
- (modified) clang/lib/Basic/Targets/SPIR.h (+2)
``````````diff
diff --git a/clang/lib/Basic/Targets/SPIR.h b/clang/lib/Basic/Targets/SPIR.h
index 61f9ef7e3e361..610efa1fe00d9 100644
--- a/clang/lib/Basic/Targets/SPIR.h
+++ b/clang/lib/Basic/Targets/SPIR.h
@@ -399,6 +399,8 @@ class LLVM_LIBRARY_VISIBILITY SPIRV64AMDGCNTargetInfo final
HasLegalHalfType = true;
HasFloat16 = true;
HalfArgsAndReturns = true;
+
+ MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
}
bool hasBFloat16Type() const override { return true; }
``````````
</details>
https://github.com/llvm/llvm-project/pull/128569
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