Fix SVE long narrowing for shifts#123666
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jakobbotsch merged 6 commits intodotnet:mainfrom Feb 5, 2026
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Pull request overview
This PR fixes an issue with SVE (Scalable Vector Extension) long narrowing operations for shift instructions by renaming and correcting the behavior of a SIMD narrowing function.
Changes:
- Renamed
NarrowSimdLongtoNarrowAndDuplicateSimdLongto accurately reflect its behavior of narrowing and duplicating elements - Fixed the element count calculation to use
sizeof(TBase)instead ofsizeof(uint64_t), which corrects the narrowing operation for shifts - Updated all call sites to use the renamed function
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| src/coreclr/jit/simd.h | Renamed function and fixed count calculation; added comprehensive XML documentation |
| src/coreclr/jit/valuenum.cpp | Updated function call to use renamed function |
| src/coreclr/jit/gentree.cpp | Updated function call to use renamed function |
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Tagging subscribers to this area: @JulieLeeMSFT, @dotnet/jit-contrib |
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@dotnet/arm64-contrib |
EgorBo
approved these changes
Jan 27, 2026
This was referenced Jan 28, 2026
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SPMI issues look unrelated to this PR. |
This was referenced Feb 2, 2026
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Ok, this looks ready to merge? Just a failing IOS build due to CI issues |
jakobbotsch
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Feb 5, 2026
lewing
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Feb 9, 2026
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Fixes #123496