llvm/llvm-project
[X86][Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow SSE/AVX FP2INT conversion intrinsics to be used in constexpr
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#169,374 opened on 2025/11/24
backend:X86clang:bytecodeclang:frontendclang:headersconstexprgood first issue
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説明
Similar to #160312 except initially we should only allow EXACT/INBOUNDS and FINITE conversions - any special case (DENORMAL/INF/NAN/etc.) or loss of precision shouldn't be allowed in constexpr for now.
_mm_cvtss_si32
_mm_cvt_ss2si
_mm_cvtss_si64
_mm_cvtps_pi32
_mm_cvt_ps2pi
_mm_cvttss_si32
_mm_cvtt_ss2si
_mm_cvttss_si64
_mm_cvttps_pi32
_mm_cvtt_ps2pi
_mm_cvtps_pi16
_mm_cvtps_pi8
_mm_cvtpd_epi32
_mm_cvtsd_si32
_mm_cvttpd_epi32
_mm_cvttsd_si32
_mm_cvtpd_pi32
_mm_cvttpd_pi32
_mm_cvtsd_si64
_mm_cvttsd_si64
_mm_cvtps_epi32
_mm_cvttps_epi32
_mm256_cvtpd_epi32
_mm256_cvttpd_epi32
_mm256_cvtps_epi32
_mm256_cvttps_epi32
There are also the AVX512 variants, but the SSE/AVX are a good starting point.