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[X86] avx512fp16intrin.h - allow fp16 truncation casts to be used in constexpr #162250

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Merged
merged 1 commit into from
Oct 7, 2025
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[X86] avx512fp16intrin.h - allow fp16 truncation casts to be used in constexpr #162250

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6 changes: 3 additions & 3 deletions clang/lib/Headers/avx512fp16intrin.h
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Original file line number Diff line number Diff line change
Expand Up @@ -193,17 +193,17 @@ _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);
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3 changes: 3 additions & 0 deletions clang/test/CodeGen/X86/avx512fp16-builtins.c
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Expand Up @@ -340,18 +340,21 @@ __m128h test_mm256_castph256_ph128(__m256h __a) {
// CHECK: shufflevector <16 x half> %{{.*}}, <16 x half> %{{.*}}, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
return _mm256_castph256_ph128(__a);
}
TEST_CONSTEXPR(match_m128h(_mm256_castph256_ph128((__m256h){-1.0, 2.0, -3.0, 4.0, -5.0, 6.0, -7.0, 8.0, -9.0, 10.0, -11.0, 12.0, -13.0, 14.0, -15.0, -16.0}), -1.0, 2.0, -3.0, 4.0, -5.0, 6.0, -7.0, 8.0));

__m128h test_mm512_castph512_ph128(__m512h __a) {
// CHECK-LABEL: test_mm512_castph512_ph128
// CHECK: shufflevector <32 x half> %{{.*}}, <32 x half> %{{.*}}, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
return _mm512_castph512_ph128(__a);
}
TEST_CONSTEXPR(match_m128h(_mm512_castph512_ph128((__m512h){0.0, -1.0, 2.0, -3.0, 4.0, -5.0, 6.0, -7.0, 8.0, -9.0, 10.0, -11.0, 12.0, -13.0, 14.0, -15.0, -16.0, -17.0, 18.0, -19.0, 20.0, -21.0, 22.0, -23.0, 24.0, -25.0, 26.0, -27.0, 28.0, -29.0, 30.0, -31.0}), 0.0, -1.0, 2.0, -3.0, 4.0, -5.0, 6.0, -7.0));

__m256h test_mm512_castph512_ph256(__m512h __a) {
// CHECK-LABEL: test_mm512_castph512_ph256
// CHECK: shufflevector <32 x half> %{{.*}}, <32 x half> %{{.*}}, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
return _mm512_castph512_ph256(__a);
}
TEST_CONSTEXPR(match_m256h(_mm512_castph512_ph256((__m512h){-1.0, 2.0, -3.0, 4.0, -5.0, 6.0, -7.0, 8.0, -9.0, 10.0, -11.0, 12.0, -13.0, 14.0, -15.0, -16.0, -17.0, 18.0, -19.0, 20.0, -21.0, 22.0, -23.0, 24.0, -25.0, 26.0, -27.0, 28.0, -29.0, 30.0, -31.0, 32.0}), -1.0, 2.0, -3.0, 4.0, -5.0, 6.0, -7.0, 8.0, -9.0, 10.0, -11.0, 12.0, -13.0, 14.0, -15.0, -16.0));

__m256h test_mm256_castph128_ph256(__m128h __a) {
// CHECK-LABEL: test_mm256_castph128_ph256
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