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 0085E3858404; Tue, 27 Sep 2022 18:31:34 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 0085E3858404
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1664303495;
	bh=N4jF4d7s3Yz/hQSpw75SCfjs2qk9qyhZTKgJBPGWH7U=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=bwm9sn1PvdBImsgPzp+OH4hoe/K6kCFhDWckk1xFGMkY0UlBhyJWNXZ1Rx8A8HPYG
	 K0u7178vJyG5EZojTQjUsiEJcIPsgpusbr3xzYOXuVGI3xKslX9sNl6qyZ5AtTFPNz
	 R6222xR0AAlRH0JzFNV2q5D/yv6ajeCW+xj4T5xA=
From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/106902] [11/12/13 Regression] Program compiled with -O3
 -mfma produces different result
Date: Tue, 27 Sep 2022 18:31:33 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 12.2.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: amonakov at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 11.4
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-106902-4-uADDgnfE3a@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-106902-4@http.gcc.gnu.org/bugzilla/>
References: <bug-106902-4@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=3D106902

--- Comment #15 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #14)
> I can't
> seem to reproduce any vectorization for your smaller example though.

My small C samples omit some detail as they were meant to illustrate what
happened in the IR. Is that a problem?

By the way, I noticed that tree-ssa-math-opts incorrectly handles
-ffp-contract:

  if (FLOAT_TYPE_P (type)
      && flag_fp_contract_mode =3D=3D FP_CONTRACT_OFF)
    return false;

It should be 'flag_fp_contract_mode !=3D FP_CONTRACT_FAST' instead (the pass
doesn't have any idea about expression boundaries). It dates back to
g:1694907238eb=