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[Headers][X86] Allow PSHUFB byte shuffle intrinsics to be used in constexpr #156612

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[Headers][X86] Allow PSHUFB byte shuffle intrinsics to be used in constexpr#156612
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shashank1545
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backend:X86clang:bytecodeIssues for the clang bytecode constexpr interpreterclang:frontendLanguage frontend issues, e.g. anything involving "Sema"clang:headersHeaders provided by Clang, e.g. for intrinsicsconstexprAnything related to constant evaluationgood first issuehttps://github.com/llvm/llvm-project/contribute
@RKSimon

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@RKSimon
RKSimon
opened on Sep 3, 2025

The i8 byte shuffle mask intrinsics can be used in constant expressions:

_mm_shuffle_pi8

_mm_shuffle_epi8 _mm_mask_shuffle_epi8 _mm_maskz_shuffle_epi8
_mm256_shuffle_epi8 _mm256_mask_shuffle_epi8 _mm256_maskz_shuffle_epi8
_mm512_shuffle_epi8 _mm512_mask_shuffle_epi8 _mm512_maskz_shuffle_epi8

These will require handling inside VectorExprEvaluator::VisitCallExpr / InterpretBuiltin

Similar testing to #153102 - single test for each intrinsic, but ensure a range of masks are used (inc some zeroing / unused bits).

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backend:X86clang:bytecodeIssues for the clang bytecode constexpr interpreterclang:frontendLanguage frontend issues, e.g. anything involving "Sema"clang:headersHeaders provided by Clang, e.g. for intrinsicsconstexprAnything related to constant evaluationgood first issuehttps://github.com/llvm/llvm-project/contribute

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