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[X86] avx512vlfp16intrin.h.h - allow _mm_cvtsh_h/_mm256_cvtsh_h to be used in constexpr #162275

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Merged
merged 1 commit into from
Oct 7, 2025
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[X86] avx512vlfp16intrin.h.h - allow _mm_cvtsh_h/_mm256_cvtsh_h to be used in constexpr #162275

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6 changes: 4 additions & 2 deletions clang/lib/Headers/avx512vlfp16intrin.h
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Original file line number Diff line number Diff line change
Expand Up @@ -34,11 +34,13 @@
#define __DEFAULT_FN_ATTRS128_CONSTEXPR __DEFAULT_FN_ATTRS128
#endif

static __inline__ _Float16 __DEFAULT_FN_ATTRS128 _mm_cvtsh_h(__m128h __a) {
static __inline__ _Float16 __DEFAULT_FN_ATTRS128_CONSTEXPR
_mm_cvtsh_h(__m128h __a) {
return __a[0];
}

static __inline__ _Float16 __DEFAULT_FN_ATTRS256 _mm256_cvtsh_h(__m256h __a) {
static __inline__ _Float16 __DEFAULT_FN_ATTRS256_CONSTEXPR
_mm256_cvtsh_h(__m256h __a) {
return __a[0];
}

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2 changes: 2 additions & 0 deletions clang/test/CodeGen/X86/avx512vlfp16-builtins.c
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Expand Up @@ -17,12 +17,14 @@ _Float16 test_mm_cvtsh_h(__m128h __A) {
// CHECK: extractelement <8 x half> %{{.*}}, i32 0
return _mm_cvtsh_h(__A);
}
TEST_CONSTEXPR(_mm_cvtsh_h((__m128h){-8.0, 7.0, -6.0, 5.0, -4.0, 3.0, -2.0, 1.0}) == -8.0);

_Float16 test_mm256_cvtsh_h(__m256h __A) {
// CHECK-LABEL: test_mm256_cvtsh_h
// CHECK: extractelement <16 x half> %{{.*}}, i32 0
return _mm256_cvtsh_h(__A);
}
TEST_CONSTEXPR(_mm256_cvtsh_h((__m256h){-32.0, 31.0, -30.0, 29.0, -28.0, 27.0, -26.0, 25.0, -24.0, 23.0, -22.0, 21.0, -20.0, 19.0, -18.0, 17.0}) == -32.0);

__m128h test_mm_set_sh(_Float16 __h) {
// CHECK-LABEL: test_mm_set_sh
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