From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 7857) id 08F583858D33; Thu, 16 Feb 2023 15:14:36 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 08F583858D33 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1676560476; bh=OOKZL7rZEfXWHFc32cmSdGkdbdv8T+5WLmuAgj08CRU=; h=From:To:Subject:Date:From; b=FFZzX0pHJXA55btllrhNGvLRAIn9IBwIYa+vEXED0QMGksLZsZeFD1L4l6o/x2hVK +DgRhyOb3iCcqB3hSZ59NKfgtD94FnQpPWMnd6hTnxmD6G+vwkdLizM2MWdiw7Ko6A VEYn1ycrGUsA6bfFW2eJkmKhmX3FclHnQ1hvea4Q= MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Matthias Kretz To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r11-10529] libstdc++: Ensure __builtin_constant_p isn't lost on the way X-Act-Checkin: gcc X-Git-Author: Matthias Kretz X-Git-Refname: refs/heads/releases/gcc-11 X-Git-Oldrev: 29b664a5d5369d80c90714d108b7a5e8caf93e4c X-Git-Newrev: e4ddaf9dd48763227ab93c8fe93f7d04080c07a1 Message-Id: <20230216151436.08F583858D33@sourceware.org> Date: Thu, 16 Feb 2023 15:14:36 +0000 (GMT) List-Id: https://gcc.gnu.org/g:e4ddaf9dd48763227ab93c8fe93f7d04080c07a1 commit r11-10529-ge4ddaf9dd48763227ab93c8fe93f7d04080c07a1 Author: Matthias Kretz Date: Fri Jan 13 16:20:36 2023 +0100 libstdc++: Ensure __builtin_constant_p isn't lost on the way The more expensive code path should only be taken if it can be optimized away. Signed-off-by: Matthias Kretz 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. (cherry picked from commit fea34ee491104f325682cc5fb75683b7d74a0a3b) Diff: --- libstdc++-v3/include/experimental/bits/simd.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/libstdc++-v3/include/experimental/bits/simd.h b/libstdc++-v3/include/experimental/bits/simd.h index 0e58ae01b17..e9a07018cf0 100644 --- a/libstdc++-v3/include/experimental/bits/simd.h +++ b/libstdc++-v3/include/experimental/bits/simd.h @@ -2546,7 +2546,8 @@ template else __execute_n_times<_Width>( [&](auto __i) { __r &= _M_data[__i.value] == _Tp(); }); - return __r; + if (__builtin_constant_p(__r)) + return __r; } return false; } @@ -2566,7 +2567,8 @@ template else __execute_n_times<_Width>( [&](auto __i) { __r &= _M_data[__i.value] == ~_Tp(); }); - return __r; + if (__builtin_constant_p(__r)) + return __r; } return false; }