From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 287FB3858D32; Fri, 31 Mar 2023 15:27:43 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 287FB3858D32
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1680276463;
	bh=/88JoLdYzQwL8VFcTfMrUpEbSGnpQZc9fM/r+kwKu1I=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=OY4iegUSFfsxbzHVXliNqs3vTrKtTNGhzebqg1c2znabnNducXid7LCFK/76f90B3
	 n4uTgs6YQXnsq3Rn4vR0534RE/IWngY0yV795ik65CURZ33yId7n3pX1iVXYiOUkjT
	 mnAW8kQf0oPSsj7USWSel70oBsYQFb6UTYK9o9vM=
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109362] codegen adds unnecessary extra add when reading
 atomic member
Date: Fri, 31 Mar 2023 15:27:43 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: FIXED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-109362-4-YnxNYjnyeu@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-109362-4@http.gcc.gnu.org/bugzilla/>
References: <bug-109362-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109362

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced C testcase would be
struct S { long a, b; };

int
foo (struct S *v)
{
  while (1)
    {
      __atomic_load_n (&v->a, __ATOMIC_ACQUIRE);
      if (__atomic_load_n (&v->b, __ATOMIC_ACQUIRE))
        return 1;
    }
}=