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From: Matthias Kretz <mkretz@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r11-10590] libstdc++: Skip integer division optimization for Clang Date: Tue, 21 Mar 2023 19:38:47 +0000 (GMT) [thread overview] Message-ID: <20230321193847.4D6123858D3C@sourceware.org> (raw) https://gcc.gnu.org/g:2f94d8c7a5370f4474b1ece17ec9aa46c48d0e8d commit r11-10590-g2f94d8c7a5370f4474b1ece17ec9aa46c48d0e8d Author: Matthias Kretz <m.kretz@gsi.de> Date: Tue Mar 21 14:20:52 2023 +0100 libstdc++: Skip integer division optimization for Clang Clang ICEs on _SimdImplX86::_S_divides. The function is only working around a missed optimization and not necessary for correctness. Therefore, don't use it for Clang. Signed-off-by: Matthias Kretz <m.kretz@gsi.de> libstdc++-v3/ChangeLog: * include/experimental/bits/simd_detail.h: Don't define _GLIBCXX_SIMD_WORKAROUND_PR90993 for Clang. * include/experimental/bits/simd_x86.h (_S_divides): Remove check for __clang__. (cherry picked from commit 403e48ef441b0502af46ad3598f699f4a1611791) Diff: --- libstdc++-v3/include/experimental/bits/simd_detail.h | 2 ++ libstdc++-v3/include/experimental/bits/simd_x86.h | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/libstdc++-v3/include/experimental/bits/simd_detail.h b/libstdc++-v3/include/experimental/bits/simd_detail.h index ecd059610cd..ca0bbdf8891 100644 --- a/libstdc++-v3/include/experimental/bits/simd_detail.h +++ b/libstdc++-v3/include/experimental/bits/simd_detail.h @@ -276,7 +276,9 @@ #endif // integer division not optimized +#ifndef __clang__ #define _GLIBCXX_SIMD_WORKAROUND_PR90993 1 +#endif // very bad codegen for extraction and concatenation of 128/256 "subregisters" // with sizeof(element type) < 8: https://godbolt.org/g/mqUsgM diff --git a/libstdc++-v3/include/experimental/bits/simd_x86.h b/libstdc++-v3/include/experimental/bits/simd_x86.h index 8df230fb773..4fff8df5db0 100644 --- a/libstdc++-v3/include/experimental/bits/simd_x86.h +++ b/libstdc++-v3/include/experimental/bits/simd_x86.h @@ -1422,7 +1422,7 @@ template <typename _Abi> }, [&__xf, &__yf](auto __i) -> _SimdWrapper<_Float, __n_intermediate> { -#if !defined __clang__ && __GCC_IEC_559 == 0 +#if __GCC_IEC_559 == 0 // If -freciprocal-math is active, using the `/` operator is // incorrect because it may be translated to an imprecise // multiplication with reciprocal. We need to use inline @@ -1477,7 +1477,7 @@ template <typename _Abi> */ return _Base::_S_divides(__x, __y); } - #endif // _GLIBCXX_SIMD_WORKAROUND_PR90993 +#endif // _GLIBCXX_SIMD_WORKAROUND_PR90993 // }}} // _S_modulus {{{
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