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 7EA163858C62; Wed, 12 Apr 2023 19:43:19 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7EA163858C62
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1681328599;
	bh=ICzDSC5z3C5nL3bylkZxz4MMXH+jcKnfmLrj3syHYog=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=TsBBq26APhtWLGuJx/v9Fqt2GVXKMAk66oMT7aJhzSP+z5XjkbncyFfeymywlpj9S
	 9btElR3iefcagHvO2EWmvH05joF8TojMFISPgISPW4nt/4CsobZ5lKYodGDlq9NGMl
	 VO3aMPuog6K6Gj/Gc/u1PQubpQiYh7DX3FNw45XA=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109483] Unoptimal uncprop with assembler flag
 output
Date: Wed, 12 Apr 2023 19:43:19 +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: 13.0
X-Bugzilla-Keywords: inline-asm, missed-optimization
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: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-109483-4-b9YElOI8AU@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-109483-4@http.gcc.gnu.org/bugzilla/>
References: <bug-109483-4@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=3D109483

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Uro=C5=A1 Bizjak from comment #4)
> Even the above is not optimal. I'd expect:
>=20
> ...
> .L8:
> #APP
> # 6 "t.c" 1
>         int3
> # 0 "" 2
> #NO_APP
>         je      .L2
>         xorl    %eax, %eax
>         ret

IF-CASE-2 found, start 3, else 5
verify found no changes in insn with uid =3D 15.
changing bb of uid 4
  from 5 to 3
deleting block 5
Conversion succeeded on pass 1.

Adding -fno-if-conversion gets what you want too. But I am not 100% sure if=
 it
is "better".=