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 8083F385B512; Thu,  1 Feb 2024 15:30:36 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8083F385B512
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1706801438;
	bh=lqD2cTvSDcQp95wpmushYoAA1mYja/ZOiMz52gb5dNw=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=sQm/S5bi14xy5yD3ziOKRCIWpvVhx8S4wDRVoivXiWvmCmLjT/HqcTml90+v9+HO6
	 SruQ9Zv1EOfhpztesiGWn2uB2t08y8+abvKjPlqSzUCka/ci+tWcPWssAylF+Vfqs7
	 sl0za9sVnihY9L5M8FDpIKvLHvW7AVo1DpJK7nBU=
From: "kristerw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/113703] ivopts miscompiles loop
Date: Thu, 01 Feb 2024 15:30:36 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: kristerw 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-113703-4-7UMEMLfXM0@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-113703-4@http.gcc.gnu.org/bugzilla/>
References: <bug-113703-4@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=3D113703

--- Comment #3 from Krister Walfridsson <kristerw at gcc dot gnu.org> ---
Oops. I messed up the test case...  It "works", but the actual values does =
not
make sense...

The following is better:

int main()
{
  long pgsz =3D sysconf (_SC_PAGESIZE);
  void *p =3D mmap (NULL, pgsz * 2, PROT_READ|PROT_WRITE,
     MAP_ANONYMOUS|MAP_PRIVATE, 0, 0);
  if (p =3D=3D MAP_FAILED)
    return 0;
  mprotect (p+pgsz, pgsz, PROT_NONE);
  uintptr_t n =3D -2 - (uintptr_t)(p+pgsz);
  f1 (p+pgsz, -2, n);
  return 0;
}=