[all-commits] [llvm/llvm-project] 73cf62: [Headers][X86] Use `__builtin_elementwise_ctlz` in...

[moorabbit via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 73cf62b25497b594312146a11cd9790e6c6e1384
      https://github.com/llvm/llvm-project/commit/73cf62b25497b594312146a11cd9790e6c6e1384
  Author: moorabbit <moorabbit at proton.me>
  Date:   2025-08-28 (Thu, 28 Aug 2025)

  Changed paths:
    M clang/include/clang/Basic/BuiltinsX86.td
    M clang/lib/CodeGen/TargetBuiltins/X86.cpp
    M clang/lib/Headers/avx512cdintrin.h
    M clang/lib/Headers/avx512vlcdintrin.h
    M clang/test/CodeGen/X86/avx512cd-builtins.c
    M clang/test/CodeGen/X86/avx512vlcd-builtins.c

  Log Message:
  -----------
  [Headers][X86] Use `__builtin_elementwise_ctlz` instead of avx512cd intrinsics. (#155089)

The following avx512 intrinsics were removed:
- `__builtin_ia32_vplzcntd_128`
- `__builtin_ia32_vplzcntd_256`
- `__builtin_ia32_vplzcntd_512`
- `__builtin_ia32_vplzcntq_128`
- `__builtin_ia32_vplzcntq_256`
- `__builtin_ia32_vplzcntq_512`

Users of the removed intrinsics (e.g. `_mm512_lzcnt_epi64`,
`_mm_lzcnt_epi32`) are now relying on `__builtin_elementwise_ctlz` and
are marked as `constexpr`.

Fixes: #154279



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