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libstdc++: Add masked ++/-- implementation for sizeof < 16

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This resolves further failures (-Wreturn-type warnings) and test
failures for where-* tests targeting AVX-512.

Signed-off-by: Matthias Kretz <m.kretz@gsi.de>

libstdc++-v3/ChangeLog:

	* include/experimental/bits/simd_x86.h (_S_masked_unary):
	Cast inputs < 16 bytes to 16 byte vectors before calling the
	right subtraction builtin. Before returning, truncate to the
	return vector type.
This commit is contained in:
Matthias Kretz 2024-03-27 13:41:25 +01:00
parent 0ac2c0f068
commit a6c630c314
1 changed files with 14 additions and 10 deletions
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24
libstdc++-v3/include/experimental/bits/simd_x86.h
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@ -3508,6 +3508,9 @@ template <typename _Abi, typename>
#ifdef __clang__
return __movm<_Np, _Tp>(__k._M_data) ? __v._M_data - __pm_one : __v._M_data;
#else // __clang__
using _TV = __vector_type_t<_Tp, _Np>;
constexpr size_t __bytes = sizeof(__v) < 16 ? 16 : sizeof(__v);
constexpr size_t __width = __bytes / sizeof(_Tp);
if constexpr (is_integral_v<_Tp>)
{
constexpr bool __lp64 = sizeof(long) == sizeof(long long);
@ -3517,11 +3520,11 @@ template <typename _Abi, typename>
std::conditional_t<__lp64, long long, int>,
std::conditional_t<
std::is_same_v<_Ip, signed char>, char, _Ip>>;
const auto __value = __vector_bitcast<_Up>(__v._M_data);
const auto __value = __intrin_bitcast<__vector_type_t<_Up, __width>>(__v._M_data);
#define _GLIBCXX_SIMD_MASK_SUB(_Sizeof, _Width, _Instr) \
if constexpr (sizeof(_Tp) == _Sizeof && sizeof(__v) == _Width) \
return __vector_bitcast<_Tp>(__builtin_ia32_##_Instr##_mask(__value, \
__vector_broadcast<_Np>(_Up(__pm_one)), __value, __k._M_data))
if constexpr (sizeof(_Tp) == _Sizeof && sizeof(__value) == _Width) \
return __intrin_bitcast<_TV>(__builtin_ia32_##_Instr##_mask(__value, \
__vector_broadcast<__width>(_Up(__pm_one)), __value, __k._M_data))
_GLIBCXX_SIMD_MASK_SUB(1, 64, psubb512);
_GLIBCXX_SIMD_MASK_SUB(1, 32, psubb256);
_GLIBCXX_SIMD_MASK_SUB(1, 16, psubb128);
@ -3538,16 +3541,17 @@ template <typename _Abi, typename>
}
else
{
const auto __value = __intrin_bitcast<__vector_type_t<_Tp, __width>>(__v._M_data);
#define _GLIBCXX_SIMD_MASK_SUB_512(_Sizeof, _Width, _Instr) \
if constexpr (sizeof(_Tp) == _Sizeof && sizeof(__v) == _Width) \
if constexpr (sizeof(_Tp) == _Sizeof && sizeof(__value) == _Width) \
return __builtin_ia32_##_Instr##_mask( \
__v._M_data, __vector_broadcast<_Np>(_Tp(__pm_one)), __v._M_data, \
__value, __vector_broadcast<__width>(_Tp(__pm_one)), __value, \
__k._M_data, _MM_FROUND_CUR_DIRECTION)
#define _GLIBCXX_SIMD_MASK_SUB(_Sizeof, _Width, _Instr) \
if constexpr (sizeof(_Tp) == _Sizeof && sizeof(__v) == _Width) \
return __builtin_ia32_##_Instr##_mask( \
__v._M_data, __vector_broadcast<_Np>(_Tp(__pm_one)), __v._M_data, \
__k._M_data)
if constexpr (sizeof(_Tp) == _Sizeof && sizeof(__value) == _Width) \
return __intrin_bitcast<_TV>(__builtin_ia32_##_Instr##_mask( \
__value, __vector_broadcast<__width>(_Tp(__pm_one)), __value, \
__k._M_data))
_GLIBCXX_SIMD_MASK_SUB_512(4, 64, subps512);
_GLIBCXX_SIMD_MASK_SUB(4, 32, subps256);
_GLIBCXX_SIMD_MASK_SUB(4, 16, subps128);