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[Clang] VectorExprEvaluator::VisitCallExpr - add MMX/SSE/AVX/AVX512 PMULHRSW intrinsics to be used in constexpr #155805

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[Clang] VectorExprEvaluator::VisitCallExpr - add MMX/SSE/AVX/AVX512 PMULHRSW intrinsics to be used in constexpr#155805
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backend:X86clang: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 Aug 28, 2025

Similar to #152524 - add handling for __builtin_ia32_pmulhrs to VectorExprEvaluator::VisitCallExpr and InterBuiltin.cpp

_mm_mulhrs_pi16
mm_mulhrs_epi16 mm256_mulhrs_epi16 mm512_mulhrs_epi16
mm_mask_mulhrs_epi16 mm256_mask_mulhrs_epi16 mm512_mask_mulhrs_epi16
mm_maskz_mulhrs_epi16 mm256_maskz_mulhrs_epi16 mm512_maskz_mulhrs_epi16

Further info on how to constant fold PMULHRSW can be found in simplifyX86pmulh in X86InstCombineIntrinsic.cpp

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backend:X86clang: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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