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 3ADE2385803E; Wed,  6 Mar 2024 13:37:08 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3ADE2385803E
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1709732228;
	bh=K1qDJmIDHUiM5DiJMqpUkylXqrDjHvnFc71J5QTYu9k=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=EPrCJu6iRTzUYG/h7P6Zmm1wOo7tV5BJ0N394gtZPac5hm3U32a9/M6J2UBSyS+W5
	 69N6uMehP5vXfWdVe5a2mBDCVncUELDFNTbUWhUvm8wZ8qO8jXktVlVzm2L6+P1geA
	 hJCBUuNI0Jm4kzIDh54dXw6uRehMZfhRN6RvM3tk=
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/105533] UBSAN: gcc/expmed.cc:3272:26: runtime error:
 signed integer overflow: -9223372036854775808 - 1 cannot be represented in
 type 'long int'
Date: Wed, 06 Mar 2024 13:37:07 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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-105533-4-yqVAvIuw5h@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-105533-4@http.gcc.gnu.org/bugzilla/>
References: <bug-105533-4@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=3D105533

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Testcase for the first compile time UB (-O3):
long long a, b, c;

void
foo (long long e)
{
  long long d =3D a & 9223372036854775808ULL;
  c =3D b;
  if (d && e)
    c =3D c | d;
}
Testcase for the second compile time UB (-O2):
int a[64];
int p;

void
foo (void)
{
  int stack_elt =3D 1;
  while (p)
    {
      stack_elt -=3D 11;
      a[stack_elt] !=3D 0;
    }
}=