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 954EA3858D37; Fri,  3 Mar 2023 08:21:09 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 954EA3858D37
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1677831669;
	bh=b71t1ZKm/COqp/3j/zPzeK4LPSFYaVy8TPFsjLDCRKs=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=iA6OMnEw/6+ULJoNFRmMe8Z0ywhaUzSYvzyiGYDM58cIXBghDk3GkJ40kPjTOhUE+
	 VdNM3oTeEBldvAqWkP4r55jaeZA/JJ6pZGeXdzyXr5qtk5SwfF+9V8CjkpuzTqfIDF
	 SJtFJG6UFx3OBcWsCnDNFiWEM/ZKrt+OsMDBXBLs=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/108990] Too restrictive precision check in fold and
 simplify pattern for PR70920
Date: Fri, 03 Mar 2023 08:21:08 +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: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: rguenth 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: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-108990-4-5ppc3PzyoK@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-108990-4@http.gcc.gnu.org/bugzilla/>
References: <bug-108990-4@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=3D108990

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Consolidating these kind of duplicates would be nice.  Note in this particu=
lar
case we should order the more specific pattern earlier (diagnosing that with
-v would be nice).

Implementing order preserving differently, for example by expressing
'A must be matched before B' explicitely would be a good improvement as wel=
l.
If you add -v to the genmatch command-line you'll see 273 cases where we
forcefully re-start matching because of intermediate "more specific" patter=
ns.=