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[Headers][X86][F16C] All f16c methods are now constexpr #160317

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Merged
merged 2 commits into from
Sep 23, 2025
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[Headers][X86][F16C] All f16c methods are now constexpr #160317

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a47dff6
[Headers][X86][F16C] All f16c methods are now constexpr
RKSimon Sep 23, 2025
aac3a9a
Merge branch 'main' into f16c-all-constexpr-functions
RKSimon Sep 23, 2025
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29 changes: 15 additions & 14 deletions clang/lib/Headers/f16cintrin.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,17 +15,20 @@
#define __F16CINTRIN_H

/* Define the default attributes for the functions in this file. */
#define __DEFAULT_FN_ATTRS128 \
__attribute__((__always_inline__, __nodebug__, __target__("f16c"), __min_vector_width__(128)))
#define __DEFAULT_FN_ATTRS256 \
__attribute__((__always_inline__, __nodebug__, __target__("f16c"), __min_vector_width__(256)))

#if defined(__cplusplus) && (__cplusplus >= 201103L)
#define __DEFAULT_FN_ATTRS128_CONSTEXPR __DEFAULT_FN_ATTRS128 constexpr
#define __DEFAULT_FN_ATTRS256_CONSTEXPR __DEFAULT_FN_ATTRS256 constexpr
#define __DEFAULT_FN_ATTRS128 \
__attribute__((__always_inline__, __nodebug__, __target__("f16c"), \
__min_vector_width__(128))) constexpr
#define __DEFAULT_FN_ATTRS256 \
__attribute__((__always_inline__, __nodebug__, __target__("f16c"), \
__min_vector_width__(256))) constexpr
#else
#define __DEFAULT_FN_ATTRS128_CONSTEXPR __DEFAULT_FN_ATTRS128
#define __DEFAULT_FN_ATTRS256_CONSTEXPR __DEFAULT_FN_ATTRS256
#define __DEFAULT_FN_ATTRS128 \
__attribute__((__always_inline__, __nodebug__, __target__("f16c"), \
__min_vector_width__(128)))
#define __DEFAULT_FN_ATTRS256 \
__attribute__((__always_inline__, __nodebug__, __target__("f16c"), \
__min_vector_width__(256)))
#endif

/* NOTE: Intel documents the 128-bit versions of these as being in emmintrin.h,
Expand All @@ -43,7 +46,7 @@
/// \param __a
/// A 16-bit half-precision float value.
/// \returns The converted 32-bit float value.
static __inline float __DEFAULT_FN_ATTRS128_CONSTEXPR
static __inline float __DEFAULT_FN_ATTRS128
_cvtsh_ss(unsigned short __a)
{
return (float)__builtin_bit_cast(__fp16, __a);
Expand Down Expand Up @@ -112,7 +115,7 @@ _cvtsh_ss(unsigned short __a)
/// A 128-bit vector containing 16-bit half-precision float values. The lower
/// 64 bits are used in the conversion.
/// \returns A 128-bit vector of [4 x float] containing converted float values.
static __inline __m128 __DEFAULT_FN_ATTRS128_CONSTEXPR
static __inline __m128 __DEFAULT_FN_ATTRS128
_mm_cvtph_ps(__m128i __a)
{
typedef __fp16 __v4fp16 __attribute__((__vector_size__(8)));
Expand Down Expand Up @@ -159,7 +162,7 @@ _mm_cvtph_ps(__m128i __a)
/// converted to 32-bit single-precision float values.
/// \returns A vector of [8 x float] containing the converted 32-bit
/// single-precision float values.
static __inline __m256 __DEFAULT_FN_ATTRS256_CONSTEXPR
static __inline __m256 __DEFAULT_FN_ATTRS256
_mm256_cvtph_ps(__m128i __a)
{
typedef __fp16 __v8fp16 __attribute__((__vector_size__(16), __aligned__(16)));
Expand All @@ -169,7 +172,5 @@ _mm256_cvtph_ps(__m128i __a)

#undef __DEFAULT_FN_ATTRS128
#undef __DEFAULT_FN_ATTRS256
#undef __DEFAULT_FN_ATTRS128_CONSTEXPR
#undef __DEFAULT_FN_ATTRS256_CONSTEXPR

#endif /* __F16CINTRIN_H */
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