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 55BCC3858017; Fri,  9 Sep 2022 08:20:16 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 55BCC3858017
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1662711616;
	bh=l4dMkfrTCXYZKYVbC4aKOuBe5ARqOWxnQSeBEHXid4M=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=NSOHCRc+jfACE3sYV35BnqyveetIMi8LlxQ9AO10BedFsq1HyPIp+rD5FUI/lg9zc
	 9jFDK2tNHBUkEVbDQ+d+1cQyGOav0qGAkJipWELQVKUPZTvtzOC7s7TWHRCDSi2wyR
	 4kkoM8Ipb7J89nKLRJHa1HVsZ8RwM4fmqFjrr/mw=
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/106892] Wrong code at -O3 on x86_64-linux-gnu
Date: Fri, 09 Sep 2022 08:20:15 +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: 13.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
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-106892-4-U1CRK0iLTk@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-106892-4@http.gcc.gnu.org/bugzilla/>
References: <bug-106892-4@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=3D106892

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I would clean it even more:
int a, b, c, d, e;
int f[8];
int g() {
  while (a)
    a >>=3D 4;
  return 0;
}
int h(int i) {
  if (i >=3D '0')
    return i - '0';
  //__builtin_unreachable ();
}
void j(int i) {
  for (b =3D 2; g() <=3D 7; b++)
    if (i) {
      for (; e <=3D 7; e++)
        for (c =3D 1; c <=3D 7; c++) {
          d =3D h(b + '0');
          f[-d + 4] ^=3D 3;
        }
      return;
    }
}
int main() {
  j(1);
  if (f[2] !=3D 0)
    __builtin_abort ();
}
so that a) it isn't ASCII specific and misbehaves for EBCDIC etc., and b)
undoes what creduce/cvise likes to do, moving expressions from for init
expression before the loop=