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 144DF3858CDA; Mon, 25 Sep 2023 06:43:04 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 144DF3858CDA
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1695624184;
	bh=U1LcxPSiRoQMuFGLtyXb+ubFHeAMjqdCJ9rSHPoRMaY=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=EBSJc2tJ0JmWXjcJJyt+4WJg/fEhqHh0tMvymJrxbv+1drRZdSYMZjE10Wo1arh2t
	 PRuYH3+xPmf/dTtGW6nR/CqMEqjdLlYmtWhcL6IepNDrkGjD/RRtjXS+Em79I3OfLz
	 SfbK9r8Bp5G7W+2mqZ8M6uAdGru9tkneltu/eyzI=
From: "cptarse-luke at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111581] [arm-none-eabi-gcc] / suboptimal optimization /
 uxth/sxth
Date: Mon, 25 Sep 2023 06:43:03 +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: 9.3.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cptarse-luke at yahoo 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-111581-4-3foLDlloKE@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-111581-4@http.gcc.gnu.org/bugzilla/>
References: <bug-111581-4@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=3D111581

--- Comment #1 from Luke <cptarse-luke at yahoo dot com> ---
in the unsigned case:
furthermore the ldrh already cleared the high half-word,
so that a uxth would be superfluous,
even if there would be a subsequent str...=