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* [gcc r12-1785] libstdc++: Fix condition when AVX512F ldexp implementation is used
@ 2021-06-24 13:34 Jonathan Wakely
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From: Jonathan Wakely @ 2021-06-24 13:34 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:5014f12509980d51cfbb34bb61b1605356592afd
commit r12-1785-g5014f12509980d51cfbb34bb61b1605356592afd
Author: Matthias Kretz <m.kretz@gsi.de>
Date: Thu Jun 24 14:20:15 2021 +0100
libstdc++: Fix condition when AVX512F ldexp implementation is used
This improves codegen of ldexp if AVX512VL is available.
Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
libstdc++-v3/ChangeLog:
* include/experimental/bits/simd_x86.h (_S_ldexp): The AVX512F
implementation doesn't require a _VecBltnBtmsk ABI tag, it
requires either a 64-Byte input (in which case AVX512F must be
available) or AVX512VL.
Diff:
---
libstdc++-v3/include/experimental/bits/simd_x86.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/experimental/bits/simd_x86.h b/libstdc++-v3/include/experimental/bits/simd_x86.h
index 305d7a9fa54..5706bf63845 100644
--- a/libstdc++-v3/include/experimental/bits/simd_x86.h
+++ b/libstdc++-v3/include/experimental/bits/simd_x86.h
@@ -2611,13 +2611,14 @@ template <typename _Abi>
_S_ldexp(_SimdWrapper<_Tp, _Np> __x,
__fixed_size_storage_t<int, _Np> __exp)
{
- if constexpr (__is_avx512_abi<_Abi>())
+ if constexpr (sizeof(__x) == 64 || __have_avx512vl)
{
const auto __xi = __to_intrin(__x);
constexpr _SimdConverter<int, simd_abi::fixed_size<_Np>, _Tp, _Abi>
__cvt;
const auto __expi = __to_intrin(__cvt(__exp));
- constexpr auto __k1 = _Abi::template _S_implicit_mask_intrin<_Tp>();
+ using _Up = __bool_storage_member_type_t<_Np>;
+ constexpr _Up __k1 = _Np < sizeof(_Up) * __CHAR_BIT__ ? _Up((1ULL << _Np) - 1) : ~_Up();
if constexpr (sizeof(__xi) == 16)
{
if constexpr (sizeof(_Tp) == 8)
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