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 E8BA43858D28; Thu, 28 Mar 2024 17:47:51 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E8BA43858D28
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1711648071;
	bh=F3XYiaHD1OaUT+o+Ak1ZXTK37adU+t7Mjpt5+a2d6gU=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=CnIrzmDjoN4byhfmVQBxut5zN0ISMNrR86JAimNJC6zYDFTC/5eI3UM1Dk60NTj4w
	 Pwoenoxya2GloQRIP6yUV5qkvaJ7J2qJRj8LCTbjzmEsfMHCDk/+FzO6T9sI7/3SEq
	 CJx8oZWeiE5dXVBRdiqBNLTim5caXfvIMS+28YRU=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112723] [11/12/13/14 Regression] Missed
 optimization for invariants 'c+c' when c += -2147483647-1 and c is a global
 variable
Date: Thu, 28 Mar 2024 17:47:51 +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: missed-optimization, TREE
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia 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: 11.5
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-112723-4-424NOOgtGN@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-112723-4@http.gcc.gnu.org/bugzilla/>
References: <bug-112723-4@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=3D112723

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
>=20
> So what's missing is a simplification pattern that ignores ops that only
> alter
> bits that are dont-care in a later operation.  That fits the backprop pass
> best, not special simplification patterns.

I think this belongs in gimple-ssa-strength-reduction like it was done for =
GCC
7.1.0/7.2.0 until that fix went in which was done for all types rather than
just overflow types.=