[clang] Make vector cast intrinsics constexpr #156381

vedantjk · 2025-09-02T01:04:55Z

Enable constexpr usage of vector bitcast intrinsics by changing from __DEFAULT_FN_ATTRS* to
__DEFAULT_FN_ATTRS*_CONSTEXPR attributes.

Updated intrinsics:

AVX-512 bitcast intrinsics: _mm512_castpd_ps, _mm512_castps_pd, _mm512_cast*_si512,
_mm512_castsi512_*
AVX-512 truncation casts: _mm512_cast*512_*128/256
AVX-512 FP16 bitcast intrinsics: all _mm*_castph_* and _mm*_cast*_ph functions
AVX-512 FP16 truncation casts: _mm*_castph*_ph*

Note: Extension casts (e.g., _mm512_castpd128_pd512) remain non-constexpr as they use
__builtin_nondeterministic_value, which cannot be used in constexpr contexts.

Fixes #156348

github-actions · 2025-09-02T01:05:19Z

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llvmbot · 2025-09-02T01:05:38Z

@llvm/pr-subscribers-backend-x86

@llvm/pr-subscribers-clang

Author: None (vedantjk)

Changes

Enable constexpr usage of vector bitcast intrinsics by changing from __DEFAULT_FN_ATTRS* to
__DEFAULT_FN_ATTRS*_CONSTEXPR attributes.

Updated intrinsics:

AVX-512 bitcast intrinsics: _mm512_castpd_ps, _mm512_castps_pd, _mm512_cast*_si512,
_mm512_castsi512_*
AVX-512 truncation casts: _mm512_cast*512_*128/256
AVX-512 FP16 bitcast intrinsics: all _mm*_castph_* and _mm*_cast*_ph functions
AVX-512 FP16 truncation casts: _mm*_castph*_ph*

Note: Extension casts (e.g., _mm512_castpd128_pd512) remain non-constexpr as they use
__builtin_nondeterministic_value, which cannot be used in constexpr contexts.

Full diff: https://github.com/llvm/llvm-project/pull/156381.diff

2 Files Affected:

(modified) clang/lib/Headers/avx512fintrin.h (+10-10)
(modified) clang/lib/Headers/avx512fp16intrin.h (+21-21)

diff --git a/clang/lib/Headers/avx512fintrin.h b/clang/lib/Headers/avx512fintrin.h
index 0006e334022b6..317891dfb8c08 100644
--- a/clang/lib/Headers/avx512fintrin.h
+++ b/clang/lib/Headers/avx512fintrin.h
@@ -408,19 +408,19 @@ _mm512_castps256_ps512(__m256 __a)
                                  1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
 }
 
-static __inline __m128d __DEFAULT_FN_ATTRS512
+static __inline __m128d __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castpd512_pd128(__m512d __a)
 {
   return __builtin_shufflevector(__a, __a, 0, 1);
 }
 
-static __inline __m256d __DEFAULT_FN_ATTRS512
+static __inline __m256d __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castpd512_pd256 (__m512d __A)
 {
   return __builtin_shufflevector(__A, __A, 0, 1, 2, 3);
 }
 
-static __inline __m128 __DEFAULT_FN_ATTRS512
+static __inline __m128 __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castps512_ps128(__m512 __a)
 {
   return __builtin_shufflevector(__a, __a, 0, 1, 2, 3);
@@ -431,13 +431,13 @@ _mm512_castps512_ps256(__m512 __A) {
   return __builtin_shufflevector(__A, __A, 0, 1, 2, 3, 4, 5, 6, 7);
 }
 
-static __inline __m512 __DEFAULT_FN_ATTRS512
+static __inline __m512 __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castpd_ps (__m512d __A)
 {
   return (__m512) (__A);
 }
 
-static __inline __m512i __DEFAULT_FN_ATTRS512
+static __inline __m512i __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castpd_si512 (__m512d __A)
 {
   return (__m512i) (__A);
@@ -452,13 +452,13 @@ _mm512_castpd128_pd512 (__m128d __A)
       __B, 0, 1, 2, 3, 4, 5, 6, 7);
 }
 
-static __inline __m512d __DEFAULT_FN_ATTRS512
+static __inline __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castps_pd (__m512 __A)
 {
   return (__m512d) (__A);
 }
 
-static __inline __m512i __DEFAULT_FN_ATTRS512
+static __inline __m512i __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castps_si512 (__m512 __A)
 {
   return (__m512i) (__A);
@@ -488,19 +488,19 @@ _mm512_castsi256_si512 (__m256i __A)
    return  __builtin_shufflevector( __A, __builtin_nondeterministic_value(__A), 0, 1, 2, 3, 4, 5, 6, 7);
 }
 
-static __inline __m512 __DEFAULT_FN_ATTRS512
+static __inline __m512 __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castsi512_ps (__m512i __A)
 {
   return (__m512) (__A);
 }
 
-static __inline __m512d __DEFAULT_FN_ATTRS512
+static __inline __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castsi512_pd (__m512i __A)
 {
   return (__m512d) (__A);
 }
 
-static __inline __m128i __DEFAULT_FN_ATTRS512
+static __inline __m128i __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castsi512_si128 (__m512i __A)
 {
   return (__m128i)__builtin_shufflevector(__A, __A , 0, 1);
diff --git a/clang/lib/Headers/avx512fp16intrin.h b/clang/lib/Headers/avx512fp16intrin.h
index 6989b86a7b68c..b8145613d06fe 100644
--- a/clang/lib/Headers/avx512fp16intrin.h
+++ b/clang/lib/Headers/avx512fp16intrin.h
@@ -113,93 +113,93 @@ _mm512_set1_pch(_Float16 _Complex __h) {
   return (__m512h)_mm512_set1_ps(__builtin_bit_cast(float, __h));
 }
 
-static __inline__ __m128 __DEFAULT_FN_ATTRS128 _mm_castph_ps(__m128h __a) {
+static __inline__ __m128 __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castph_ps(__m128h __a) {
   return (__m128)__a;
 }
 
-static __inline__ __m256 __DEFAULT_FN_ATTRS256 _mm256_castph_ps(__m256h __a) {
+static __inline__ __m256 __DEFAULT_FN_ATTRS256_CONSTEXPR _mm256_castph_ps(__m256h __a) {
   return (__m256)__a;
 }
 
-static __inline__ __m512 __DEFAULT_FN_ATTRS512 _mm512_castph_ps(__m512h __a) {
+static __inline__ __m512 __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_castph_ps(__m512h __a) {
   return (__m512)__a;
 }
 
-static __inline__ __m128d __DEFAULT_FN_ATTRS128 _mm_castph_pd(__m128h __a) {
+static __inline__ __m128d __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castph_pd(__m128h __a) {
   return (__m128d)__a;
 }
 
-static __inline__ __m256d __DEFAULT_FN_ATTRS256 _mm256_castph_pd(__m256h __a) {
+static __inline__ __m256d __DEFAULT_FN_ATTRS256_CONSTEXPR _mm256_castph_pd(__m256h __a) {
   return (__m256d)__a;
 }
 
-static __inline__ __m512d __DEFAULT_FN_ATTRS512 _mm512_castph_pd(__m512h __a) {
+static __inline__ __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_castph_pd(__m512h __a) {
   return (__m512d)__a;
 }
 
-static __inline__ __m128i __DEFAULT_FN_ATTRS128 _mm_castph_si128(__m128h __a) {
+static __inline__ __m128i __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castph_si128(__m128h __a) {
   return (__m128i)__a;
 }
 
-static __inline__ __m256i __DEFAULT_FN_ATTRS256
+static __inline__ __m256i __DEFAULT_FN_ATTRS256_CONSTEXPR
 _mm256_castph_si256(__m256h __a) {
   return (__m256i)__a;
 }
 
-static __inline__ __m512i __DEFAULT_FN_ATTRS512
+static __inline__ __m512i __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castph_si512(__m512h __a) {
   return (__m512i)__a;
 }
 
-static __inline__ __m128h __DEFAULT_FN_ATTRS128 _mm_castps_ph(__m128 __a) {
+static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castps_ph(__m128 __a) {
   return (__m128h)__a;
 }
 
-static __inline__ __m256h __DEFAULT_FN_ATTRS256 _mm256_castps_ph(__m256 __a) {
+static __inline__ __m256h __DEFAULT_FN_ATTRS256_CONSTEXPR _mm256_castps_ph(__m256 __a) {
   return (__m256h)__a;
 }
 
-static __inline__ __m512h __DEFAULT_FN_ATTRS512 _mm512_castps_ph(__m512 __a) {
+static __inline__ __m512h __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_castps_ph(__m512 __a) {
   return (__m512h)__a;
 }
 
-static __inline__ __m128h __DEFAULT_FN_ATTRS128 _mm_castpd_ph(__m128d __a) {
+static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castpd_ph(__m128d __a) {
   return (__m128h)__a;
 }
 
-static __inline__ __m256h __DEFAULT_FN_ATTRS256 _mm256_castpd_ph(__m256d __a) {
+static __inline__ __m256h __DEFAULT_FN_ATTRS256_CONSTEXPR _mm256_castpd_ph(__m256d __a) {
   return (__m256h)__a;
 }
 
-static __inline__ __m512h __DEFAULT_FN_ATTRS512 _mm512_castpd_ph(__m512d __a) {
+static __inline__ __m512h __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_castpd_ph(__m512d __a) {
   return (__m512h)__a;
 }
 
-static __inline__ __m128h __DEFAULT_FN_ATTRS128 _mm_castsi128_ph(__m128i __a) {
+static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castsi128_ph(__m128i __a) {
   return (__m128h)__a;
 }
 
-static __inline__ __m256h __DEFAULT_FN_ATTRS256
+static __inline__ __m256h __DEFAULT_FN_ATTRS256_CONSTEXPR
 _mm256_castsi256_ph(__m256i __a) {
   return (__m256h)__a;
 }
 
-static __inline__ __m512h __DEFAULT_FN_ATTRS512
+static __inline__ __m512h __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castsi512_ph(__m512i __a) {
   return (__m512h)__a;
 }
 
-static __inline__ __m128h __DEFAULT_FN_ATTRS256
+static __inline__ __m128h __DEFAULT_FN_ATTRS256_CONSTEXPR
 _mm256_castph256_ph128(__m256h __a) {
   return __builtin_shufflevector(__a, __a, 0, 1, 2, 3, 4, 5, 6, 7);
 }
 
-static __inline__ __m128h __DEFAULT_FN_ATTRS512
+static __inline__ __m128h __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castph512_ph128(__m512h __a) {
   return __builtin_shufflevector(__a, __a, 0, 1, 2, 3, 4, 5, 6, 7);
 }
 
-static __inline__ __m256h __DEFAULT_FN_ATTRS512
+static __inline__ __m256h __DEFAULT_FN_ATTRS512_CONSTEXPR
 _mm512_castph512_ph256(__m512h __a) {
   return __builtin_shufflevector(__a, __a, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
                                  12, 13, 14, 15);

ckoparkar

I think you missed _mm256_castph256_* intrinsics.
Could you please add TEST_CONSTEXPR tests to appropriate files? E.g. to avx512f-builtins.c, avx512fp16-builtins.c etc.

ckoparkar · 2025-09-02T03:00:13Z

clang/lib/Headers/avx512fp16intrin.h

 }

-static __inline__ __m128 __DEFAULT_FN_ATTRS128 _mm_castph_ps(__m128h __a) {
+static __inline__ __m128 __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castph_ps(__m128h __a) {


Could you please run clang-format on this patch? Some lines here are longer than 80 chars so the code formatter check will likely fail.

Will do and raise a new revision.

RKSimon

Thanks - the next step is to add suitable test coverage to the relevant builtins file like we have in the other x86 constexpr patches e.g. #152435

github-actions · 2025-09-02T09:06:56Z

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff origin/main HEAD --extensions h -- clang/lib/Headers/avx512fintrin.h clang/lib/Headers/avx512fp16intrin.h

⚠️
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing origin/main to the base branch/commit you want to compare against.
⚠️

View the diff from clang-format here.

diff --git a/clang/lib/Headers/avx512fintrin.h b/clang/lib/Headers/avx512fintrin.h
index 317891dfb..3b65ef4a3 100644
--- a/clang/lib/Headers/avx512fintrin.h
+++ b/clang/lib/Headers/avx512fintrin.h
@@ -409,20 +409,17 @@ _mm512_castps256_ps512(__m256 __a)
 }
 
 static __inline __m128d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castpd512_pd128(__m512d __a)
-{
+_mm512_castpd512_pd128(__m512d __a) {
   return __builtin_shufflevector(__a, __a, 0, 1);
 }
 
 static __inline __m256d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castpd512_pd256 (__m512d __A)
-{
+_mm512_castpd512_pd256(__m512d __A) {
   return __builtin_shufflevector(__A, __A, 0, 1, 2, 3);
 }
 
 static __inline __m128 __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castps512_ps128(__m512 __a)
-{
+_mm512_castps512_ps128(__m512 __a) {
   return __builtin_shufflevector(__a, __a, 0, 1, 2, 3);
 }
 
@@ -432,14 +429,12 @@ _mm512_castps512_ps256(__m512 __A) {
 }
 
 static __inline __m512 __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castpd_ps (__m512d __A)
-{
+_mm512_castpd_ps(__m512d __A) {
   return (__m512) (__A);
 }
 
 static __inline __m512i __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castpd_si512 (__m512d __A)
-{
+_mm512_castpd_si512(__m512d __A) {
   return (__m512i) (__A);
 }
 
@@ -453,14 +448,12 @@ _mm512_castpd128_pd512 (__m128d __A)
 }
 
 static __inline __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castps_pd (__m512 __A)
-{
+_mm512_castps_pd(__m512 __A) {
   return (__m512d) (__A);
 }
 
 static __inline __m512i __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castps_si512 (__m512 __A)
-{
+_mm512_castps_si512(__m512 __A) {
   return (__m512i) (__A);
 }
 
@@ -489,20 +482,17 @@ _mm512_castsi256_si512 (__m256i __A)
 }
 
 static __inline __m512 __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castsi512_ps (__m512i __A)
-{
+_mm512_castsi512_ps(__m512i __A) {
   return (__m512) (__A);
 }
 
 static __inline __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castsi512_pd (__m512i __A)
-{
+_mm512_castsi512_pd(__m512i __A) {
   return (__m512d) (__A);
 }
 
 static __inline __m128i __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_castsi512_si128 (__m512i __A)
-{
+_mm512_castsi512_si128(__m512i __A) {
   return (__m128i)__builtin_shufflevector(__A, __A , 0, 1);
 }
 
diff --git a/clang/lib/Headers/avx512fp16intrin.h b/clang/lib/Headers/avx512fp16intrin.h
index b8145613d..cb053768b 100644
--- a/clang/lib/Headers/avx512fp16intrin.h
+++ b/clang/lib/Headers/avx512fp16intrin.h
@@ -113,31 +113,38 @@ _mm512_set1_pch(_Float16 _Complex __h) {
   return (__m512h)_mm512_set1_ps(__builtin_bit_cast(float, __h));
 }
 
-static __inline__ __m128 __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castph_ps(__m128h __a) {
+static __inline__ __m128 __DEFAULT_FN_ATTRS128_CONSTEXPR
+_mm_castph_ps(__m128h __a) {
   return (__m128)__a;
 }
 
-static __inline__ __m256 __DEFAULT_FN_ATTRS256_CONSTEXPR _mm256_castph_ps(__m256h __a) {
+static __inline__ __m256 __DEFAULT_FN_ATTRS256_CONSTEXPR
+_mm256_castph_ps(__m256h __a) {
   return (__m256)__a;
 }
 
-static __inline__ __m512 __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_castph_ps(__m512h __a) {
+static __inline__ __m512 __DEFAULT_FN_ATTRS512_CONSTEXPR
+_mm512_castph_ps(__m512h __a) {
   return (__m512)__a;
 }
 
-static __inline__ __m128d __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castph_pd(__m128h __a) {
+static __inline__ __m128d __DEFAULT_FN_ATTRS128_CONSTEXPR
+_mm_castph_pd(__m128h __a) {
   return (__m128d)__a;
 }
 
-static __inline__ __m256d __DEFAULT_FN_ATTRS256_CONSTEXPR _mm256_castph_pd(__m256h __a) {
+static __inline__ __m256d __DEFAULT_FN_ATTRS256_CONSTEXPR
+_mm256_castph_pd(__m256h __a) {
   return (__m256d)__a;
 }
 
-static __inline__ __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_castph_pd(__m512h __a) {
+static __inline__ __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
+_mm512_castph_pd(__m512h __a) {
   return (__m512d)__a;
 }
 
-static __inline__ __m128i __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castph_si128(__m128h __a) {
+static __inline__ __m128i __DEFAULT_FN_ATTRS128_CONSTEXPR
+_mm_castph_si128(__m128h __a) {
   return (__m128i)__a;
 }
 
@@ -151,31 +158,38 @@ _mm512_castph_si512(__m512h __a) {
   return (__m512i)__a;
 }
 
-static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castps_ph(__m128 __a) {
+static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR
+_mm_castps_ph(__m128 __a) {
   return (__m128h)__a;
 }
 
-static __inline__ __m256h __DEFAULT_FN_ATTRS256_CONSTEXPR _mm256_castps_ph(__m256 __a) {
+static __inline__ __m256h __DEFAULT_FN_ATTRS256_CONSTEXPR
+_mm256_castps_ph(__m256 __a) {
   return (__m256h)__a;
 }
 
-static __inline__ __m512h __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_castps_ph(__m512 __a) {
+static __inline__ __m512h __DEFAULT_FN_ATTRS512_CONSTEXPR
+_mm512_castps_ph(__m512 __a) {
   return (__m512h)__a;
 }
 
-static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castpd_ph(__m128d __a) {
+static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR
+_mm_castpd_ph(__m128d __a) {
   return (__m128h)__a;
 }
 
-static __inline__ __m256h __DEFAULT_FN_ATTRS256_CONSTEXPR _mm256_castpd_ph(__m256d __a) {
+static __inline__ __m256h __DEFAULT_FN_ATTRS256_CONSTEXPR
+_mm256_castpd_ph(__m256d __a) {
   return (__m256h)__a;
 }
 
-static __inline__ __m512h __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_castpd_ph(__m512d __a) {
+static __inline__ __m512h __DEFAULT_FN_ATTRS512_CONSTEXPR
+_mm512_castpd_ph(__m512d __a) {
   return (__m512h)__a;
 }
 
-static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR _mm_castsi128_ph(__m128i __a) {
+static __inline__ __m128h __DEFAULT_FN_ATTRS128_CONSTEXPR
+_mm_castsi128_ph(__m128i __a) {
   return (__m128h)__a;
 }

RKSimon

test coverage?

vedantjk and others added 3 commits September 1, 2025 18:02

[clang] Make vector cast intrinsics constexpr

9833270

Merge branch 'llvm:main' into main

15966a7

Merge branch 'main' into main

78a4749

llvmbot added clang Clang issues not falling into any other category backend:X86 clang:headers Headers provided by Clang, e.g. for intrinsics labels Sep 2, 2025

vedantjk mentioned this pull request Sep 2, 2025

[Headers][X86] Allow vector bitcast intrinsics to be used in constexpr #156348

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