From: Matthias Kretz <m.kretz@gsi.de>
To: <gcc-patches@gcc.gnu.org>, <libstdc++@gcc.gnu.org>
Subject: [PATCH 1/7] libstdc++: Ensure __builtin_constant_p isn't lost on the way
Date: Wed, 15 Feb 2023 21:49:36 +0100 [thread overview]
Message-ID: <21793652.EfDdHjke4D@minbar> (raw)
In-Reply-To: <3238840.44csPzL39Z@minbar>
[-- Attachment #1: Type: text/plain, Size: 1075 bytes --]
The more expensive code path should only be taken if it can be optimized
away.
Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
libstdc++-v3/ChangeLog:
* include/experimental/bits/simd.h
(_SimdWrapper::_M_is_constprop_none_of)
(_SimdWrapper::_M_is_constprop_all_of): Return false unless the
computed result still satisfies __builtin_constant_p.
---
libstdc++-v3/include/experimental/bits/simd.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--
──────────────────────────────────────────────────────────────────────────
Dr. Matthias Kretz https://mattkretz.github.io
GSI Helmholtz Centre for Heavy Ion Research https://gsi.de
stdₓ::simd
──────────────────────────────────────────────────────────────────────────
[-- Attachment #2: 0001-libstdc-Ensure-__builtin_constant_p-isn-t-lost-on-th.patch --]
[-- Type: text/x-patch, Size: 786 bytes --]
diff --git a/libstdc++-v3/include/experimental/bits/simd.h b/libstdc++-v3/include/experimental/bits/simd.h
index e76f4781fa6..3de966bbf22 100644
--- a/libstdc++-v3/include/experimental/bits/simd.h
+++ b/libstdc++-v3/include/experimental/bits/simd.h
@@ -2673,7 +2673,8 @@ template <typename _Tp, size_t _Width>
else
__execute_n_times<_Width>(
[&](auto __i) { __r &= _M_data[__i.value] == _Tp(); });
- return __r;
+ if (__builtin_constant_p(__r))
+ return __r;
}
return false;
}
@@ -2693,7 +2694,8 @@ template <typename _Tp, size_t _Width>
else
__execute_n_times<_Width>(
[&](auto __i) { __r &= _M_data[__i.value] == ~_Tp(); });
- return __r;
+ if (__builtin_constant_p(__r))
+ return __r;
}
return false;
}
next prev parent reply other threads:[~2023-02-15 20:49 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-15 20:48 [PATCH 0/7] Work on PR108030 and several simd bugfixes and testsuite improvements Matthias Kretz
2023-02-15 20:49 ` Matthias Kretz [this message]
2023-02-15 23:20 ` [PATCH 1/7] libstdc++: Ensure __builtin_constant_p isn't lost on the way Jonathan Wakely
2023-02-15 20:49 ` [PATCH 2/7] libstdc++: Annotate most lambdas with always_inline Matthias Kretz
2023-02-16 14:10 ` Jonathan Wakely
2023-02-15 20:49 ` [PATCH 3/7] libstdc++: Document timeout and timeout-factor of simd tests Matthias Kretz
2023-02-15 23:17 ` Jonathan Wakely
2023-02-15 20:49 ` [PATCH 4/7] libstdc++: Use a PCH to speed up check-simd Matthias Kretz
2023-02-16 14:13 ` Jonathan Wakely
2023-02-15 20:50 ` [PATCH 5/7] libstdc++: printf format string fix in testsuite Matthias Kretz
2023-02-15 23:16 ` Jonathan Wakely
2023-02-15 20:50 ` [PATCH 6/7] libstdc++: Fix incorrect __builtin_is_constant_evaluated calls Matthias Kretz
2023-02-15 23:21 ` Jonathan Wakely
2023-02-15 20:50 ` [PATCH 7/7] libstdc++: Fix incorrect function call in -ffast-math optimization Matthias Kretz
2023-02-15 23:19 ` Jonathan Wakely
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