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 564493858C39; Tue, 10 Oct 2023 01:51:01 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 564493858C39
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1696902661;
	bh=jyBDugDF5LNVXtCENQ46BZBHEwSEvNNxK0LnTDi805k=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=bZ/kuIAeygtA9op/TtBF3HeuOt5ZHM/dak8i5z5WJzlKEPKZX7Hr0kei+p/4FyDDy
	 YmfQIEfDpNG9NRWUWpFfYcWjz9rf32gkg98waGaEis0uEd+xjqVd0GiNl9DllhnVKe
	 eDM8xlnpUT+L9CZXgABGAVHpeeLRl+hv388n4oQs=
From: "iamanonymous.cs at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111738] incorrect code when PGO is enabled
Date: Tue, 10 Oct 2023 01:50:54 +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: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: iamanonymous.cs at gmail dot com
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-111738-4-rqk7BDiTGo@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-111738-4@http.gcc.gnu.org/bugzilla/>
References: <bug-111738-4@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=3D111738

--- Comment #3 from Anonymous <iamanonymous.cs at gmail dot com> ---
(In reply to Richard Biener from comment #1)
> I can't reproduce.  Your git version is quite old, it translates to
> r14-2634-g85da0b40538fb0 for me.  It doesn't reproduce with r14-2282 eith=
er
> though.
>=20
> Current is r14-4486-g873586ebc565b6

Hi, Richard. According to your suggestion, we have updated our gcc to the
latest trunk as:
$ gcc -v
Using built-in specs.
COLLECT_GCC=3D/root/gcc_set/202310092007/bin/gcc
COLLECT_LTO_WRAPPER=3D/root/gcc_set/202310092007/libexec/gcc/x86_64-pc-linu=
x-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=3D/root/gcc_set/202310092007
--with-gmp=3D/root/build_essential --with-mpfr=3D/root/build_essential
--with-mpc=3D/root/build_essential --enable-languages=3Dc,c++ --disable-mul=
tilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20231009 (experimental) (GCC)

git version: dee55cf59ceea989f47e7605205c6644b27a1f78


Then, we compiled the same test program with/without PGO enabled and found =
that
the results are inconsistent as:
$ gcc -O3 -w -fprofile-generate=3Dprofile a.c -o a.out
$ ./a.out
4
$ gcc -O3 -w -fprofile-use=3Dprofile -Wno-missing-profile -fprofile-correct=
ion
a.c -o a.out
$ ./a.out
32765=