llvm/llvm-project

[Headers][X86] Allow AVX512 masked bitlogic intrinsics to be used in constexpr

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#160,556 opened on Sep 24, 2025

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backend:X86clang:headersconstexprgood first issue

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Description

These appear to be missed in earlier patches like #152313 as we didn't have mask/maskz constexpr support back then

avx512fintrin.h

_mm512_maskz_and_epi32 / _mm512_maskz_and_epi64
_mm512_mask_andnot_epi32 / _mm512_mask_andnot_epi64
_mm512_maskz_andnot_epi32 / _mm512_maskz_andnot_epi64
_mm512_mask_or_epi32 / _mm512_mask_or_epi64
_mm512_maskz_or_epi32 / _mm512_maskz_or_epi64
_mm512_mask_xor_epi32 / _mm512_mask_xor_epi64
_mm512_maskz_xor_epi32 / _mm512_maskz_xor_epi64

avx512vlintrin.h

_mm_mask_and_epi32 / _mm256_mask_and_epi32
_mm_maskz_and_epi32 / _mm256_maskz_and_epi32
_mm_mask_andnot_epi32 / _mm256_mask_andnot_epi32
_mm_maskz_andnot_epi32 / _mm256_maskz_andnot_epi32
_mm_mask_or_epi32 / _mm256_mask_or_epi32
_mm_maskz_or_epi32 / _mm256_maskz_or_epi32
_mm_mask_xor_epi32 / _mm256_mask_xor_epi32
_mm_maskz_xor_epi32 / _mm256_maskz_xor_epi32

_mm_mask_and_epi64 / _mm256_mask_and_epi64
_mm_maskz_and_epi64 / _mm256_maskz_and_epi64
_mm_mask_andnot_epi64 / _mm256_mask_andnot_epi64
_mm_maskz_andnot_epi64 / _mm256_maskz_andnot_epi64
_mm_mask_or_epi64 / _mm256_mask_or_epi64
_mm_maskz_or_epi64 / _mm256_maskz_or_epi64
_mm_mask_xor_epi64 / _mm256_mask_xor_epi64
_mm_maskz_xor_epi64 / _mm256_maskz_xor_epi64

avx512dqintrin.h

_mm512_maskz_and_ps / _mm512_maskz_and_pd
_mm512_mask_andnot_ps / _mm512_mask_andnot_pd
_mm512_maskz_andnot_ps / _mm512_maskz_andnot_pd
_mm512_mask_or_ps / _mm512_mask_or_pd
_mm512_maskz_or_ps / _mm512_maskz_or_pd
_mm512_mask_xor_ps / _mm512_mask_xor_pd
_mm512_maskz_xor_ps / _mm512_maskz_xor_pd

avx512vldqintrin.h

_mm_mask_and_ps / _mm256_mask_and_ps
_mm_maskz_and_ps / _mm256_maskz_and_ps
_mm_mask_andnot_ps / _mm256_mask_andnot_ps
_mm_maskz_andnot_ps / _mm256_maskz_andnot_ps
_mm_mask_or_ps / _mm256_mask_or_ps
_mm_maskz_or_ps / _mm256_maskz_or_ps
_mm_mask_xor_ps / _mm256_mask_xor_ps
_mm_maskz_xor_ps / _mm256_maskz_xor_ps

_mm_mask_and_pd / _mm256_mask_and_pd
_mm_maskz_and_pd / _mm256_maskz_and_pd
_mm_mask_andnot_pd / _mm256_mask_andnot_pd
_mm_maskz_andnot_pd / _mm256_maskz_andnot_pd
_mm_mask_or_pd / _mm256_mask_or_pd
_mm_maskz_or_pd / _mm256_maskz_or_pd
_mm_mask_xor_pd / _mm256_mask_xor_pd
_mm_maskz_xor_pd / _mm256_maskz_xor_pd

(I may have missed a few...)

Contributor guide

Research direction
Study the pattern used in previous patches like #152313 for adding constexpr to similar intrinsics. Then apply the same pattern to the listed functions in avx512fintrin.h, avx512vlintrin.h, avx512dqintrin.h, and avx512vldqintrin.h.
Tech stack
None
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++AVX intrinsicsGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60