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[Headers][X86] Allow AVX1 fixed extraction intrinsics to be used in constexpr #161218

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Merged
merged 3 commits into from
Sep 29, 2025
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[Headers][X86] Allow AVX1 fixed extraction intrinsics to be used in constexpr #161218

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416a4a9
[Headers][X86] Allow AVX1 fixed extraction intrinsics to be used in c…
ckoparkar Sep 29, 2025
38c83e7
Fix formatting
ckoparkar Sep 29, 2025
bcdec54
Fix formatting, again
ckoparkar Sep 29, 2025
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23 changes: 10 additions & 13 deletions clang/lib/Headers/avxintrin.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2311,10 +2311,9 @@ _mm256_cvttps_epi32(__m256 __a)
/// \param __a
/// A 256-bit vector of [4 x double].
/// \returns A 64 bit double containing the first element of the input vector.
static __inline double __DEFAULT_FN_ATTRS
_mm256_cvtsd_f64(__m256d __a)
{
return __a[0];
static __inline double __DEFAULT_FN_ATTRS_CONSTEXPR
_mm256_cvtsd_f64(__m256d __a) {
return __a[0];
}

/// Returns the first element of the input vector of [8 x i32].
Expand All @@ -2327,11 +2326,10 @@ _mm256_cvtsd_f64(__m256d __a)
/// \param __a
/// A 256-bit vector of [8 x i32].
/// \returns A 32 bit integer containing the first element of the input vector.
static __inline int __DEFAULT_FN_ATTRS
_mm256_cvtsi256_si32(__m256i __a)
{
__v8si __b = (__v8si)__a;
return __b[0];
static __inline int __DEFAULT_FN_ATTRS_CONSTEXPR
_mm256_cvtsi256_si32(__m256i __a) {
__v8si __b = (__v8si)__a;
return __b[0];
}

/// Returns the first element of the input vector of [8 x float].
Expand All @@ -2344,10 +2342,9 @@ _mm256_cvtsi256_si32(__m256i __a)
/// \param __a
/// A 256-bit vector of [8 x float].
/// \returns A 32 bit float containing the first element of the input vector.
static __inline float __DEFAULT_FN_ATTRS
_mm256_cvtss_f32(__m256 __a)
{
return __a[0];
static __inline float __DEFAULT_FN_ATTRS_CONSTEXPR
_mm256_cvtss_f32(__m256 __a) {
return __a[0];
}

/* Vector replicate */
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3 changes: 3 additions & 0 deletions clang/test/CodeGen/X86/avx-builtins.c
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Expand Up @@ -985,18 +985,21 @@ double test_mm256_cvtsd_f64(__m256d __a) {
// CHECK: extractelement <4 x double> %{{.*}}, i32 0
return _mm256_cvtsd_f64(__a);
}
TEST_CONSTEXPR(_mm256_cvtsd_f64((__m256d){8.0, 7.0, 6.0, 5.0}) == 8.0);

int test_mm256_cvtsi256_si32(__m256i __a) {
// CHECK-LABEL: test_mm256_cvtsi256_si32
// CHECK: extractelement <8 x i32> %{{.*}}, i32 0
return _mm256_cvtsi256_si32(__a);
}
TEST_CONSTEXPR(_mm256_cvtsi256_si32((__m256i)(__v8si){8, 7, 6, 5, 4, 3, 2, 1}) == 8);

float test_mm256_cvtss_f32(__m256 __a) {
// CHECK-LABEL: test_mm256_cvtss_f32
// CHECK: extractelement <8 x float> %{{.*}}, i32 0
return _mm256_cvtss_f32(__a);
}
TEST_CONSTEXPR(_mm256_cvtss_f32((__m256){8.0f, 7.0f, 6.0f, 5.0f, 4.0f, 3.0f, 2.0f, 1.0f}) == 8.0f);

__m128i test_mm256_cvttpd_epi32(__m256d A) {
// CHECK-LABEL: test_mm256_cvttpd_epi32
Expand Down