* [PATCH] libstdc++: Use more precise __RECIPROCAL_MATH__ macro
@ 2023-03-21 17:05 Matthias Kretz
2023-03-21 17:11 ` Jonathan Wakely
0 siblings, 1 reply; 2+ messages in thread
From: Matthias Kretz @ 2023-03-21 17:05 UTC (permalink / raw)
To: gcc-patches, libstdc++
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Tested on x86_64-pc-linux-gnu.
--------- 8< -----------
Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
libstdc++-v3/ChangeLog:
* include/experimental/bits/simd_x86.h
(_SimdImplX86::_S_divides): Replace test for __GCC_IEC_559 == 0
with __RECIPROCAL_MATH__.
---
libstdc++-v3/include/experimental/bits/simd_x86.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--
──────────────────────────────────────────────────────────────────────────
Dr. Matthias Kretz https://mattkretz.github.io
GSI Helmholtz Centre for Heavy Ion Research https://gsi.de
stdₓ::simd
──────────────────────────────────────────────────────────────────────────
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diff --git a/libstdc++-v3/include/experimental/bits/simd_x86.h b/libstdc++-v3/include/experimental/bits/simd_x86.h
index 28ba344c2b2..2a3e74d9119 100644
--- a/libstdc++-v3/include/experimental/bits/simd_x86.h
+++ b/libstdc++-v3/include/experimental/bits/simd_x86.h
@@ -1469,7 +1469,7 @@ _CsrGuard()
[&__xf, &__yf](auto __i) _GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA
-> _SimdWrapper<_Float, __n_intermediate>
{
-#if __GCC_IEC_559 == 0
+#if __RECIPROCAL_MATH__
// 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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] libstdc++: Use more precise __RECIPROCAL_MATH__ macro
2023-03-21 17:05 [PATCH] libstdc++: Use more precise __RECIPROCAL_MATH__ macro Matthias Kretz
@ 2023-03-21 17:11 ` Jonathan Wakely
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2023-03-21 17:11 UTC (permalink / raw)
To: Matthias Kretz; +Cc: gcc-patches, libstdc++
[-- Attachment #1: Type: text/plain, Size: 400 bytes --]
On Tue, 21 Mar 2023 at 17:05, Matthias Kretz via Libstdc++ <
libstdc++@gcc.gnu.org> wrote:
> Tested on x86_64-pc-linux-gnu.
>
> --------- 8< -----------
>
> Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
>
> libstdc++-v3/ChangeLog:
>
> * include/experimental/bits/simd_x86.h
> (_SimdImplX86::_S_divides): Replace test for __GCC_IEC_559 == 0
> with __RECIPROCAL_MATH__.
OK
^ permalink raw reply [flat|nested] 2+ messages in thread
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