| Issue |
209022
|
| Summary |
[InstCombine] Select-to-masked.load fold drops metadata
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
RonDahan101
|
The select(mask, masked.load(ptr, mask, passthrough), val) → masked.load(ptr, mask, val) fold introduced in [#160522](https://github.com/llvm/llvm-project/pull/160522) (commit eb8589987267)
creates a new masked.load via Builder.CreateMaskedLoad() without copying metadata from the original instruction.
This causes !tbaa , !alias.scope , !noalias , and any other metadata on the original masked.load to be silently dropped, leading to incorrect alias analysis results downstream.
The fix is to call copyMetadata from the original instruction onto the newly created one.
reproduce: https://compiler-explorer.com/z/dT7EoG17n
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