[all-commits] [llvm/llvm-project] 22d354: [X86][Clang] Support constexpr evaluation of cvtpd...

[Hamza Hassanain via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 22d354a2f25e3817ab2e9816eff43fc7ad4de472
      https://github.com/llvm/llvm-project/commit/22d354a2f25e3817ab2e9816eff43fc7ad4de472
  Author: Hamza Hassanain <53662962+HamzaHassanain at users.noreply.github.com>
  Date:   2025-12-03 (Wed, 03 Dec 2025)

  Changed paths:
    M clang/include/clang/Basic/BuiltinsX86.td
    M clang/lib/AST/ByteCode/InterpBuiltin.cpp
    M clang/lib/AST/ExprConstant.cpp
    M clang/lib/Headers/avx512fintrin.h
    M clang/lib/Headers/avx512vlintrin.h
    M clang/lib/Headers/avxintrin.h
    M clang/lib/Headers/emmintrin.h
    M clang/test/CodeGen/X86/avx-builtins.c
    M clang/test/CodeGen/X86/avx512f-builtins.c
    M clang/test/CodeGen/X86/avx512vl-builtins.c
    M clang/test/CodeGen/X86/sse2-builtins.c
    A clang/test/SemaCXX/constexpr-x86-avx-builtins.cpp
    A clang/test/SemaCXX/constexpr-x86-avx512f-builtins.cpp
    A clang/test/SemaCXX/constexpr-x86-avx512vl-builtins.cpp
    A clang/test/SemaCXX/constexpr-x86-sse2-builtins.cpp

  Log Message:
  -----------
  [X86][Clang] Support constexpr evaluation of cvtpd2ps intrinsics (#169980)

This patch implements constant evaluation support for the following X86
intrinsics:
- _mm_cvtpd_ps, _mm256_cvtpd_ps (Packed Double to Float)
- _mm_cvtsd_ss (Scalar Double to Float merge)
- Masked variants of the above

It implements the strict "Exact and Finite" rule: conversions that are
inexact, infinite, or NaN are rejected in constexpr contexts.

Fixes #169370



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