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 6848B3858D1E; Thu, 11 Apr 2024 11:38:45 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6848B3858D1E
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1712835525;
	bh=36wextjzNDyIwHTyS9GfBjM3XtMkWjUJlVI2l6kgWu0=;
	h=From:To:Subject:Date:From;
	b=Oiz98tQI7csQEorZgff5l2mnFNEl1XB7jVh7IJgq/uqO35nZd6xR6rCe3uBh9XW2e
	 KVkeYHUcIzsnK1H3TuytTwlZrm5HMEjoUzqSeqdShOH5+WygApkLVLTLA85NSCT0MQ
	 +/3EmHnu6RtAkd+jci8puGcJUzSdEweigTHYJHj8=
From: "absoler at smail dot nju.edu.cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/114693] New: `expand` introduce redundant
 store facing logic expression
Date: Thu, 11 Apr 2024 11:38:44 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 13.2.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: absoler at smail dot nju.edu.cn
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: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-114693-4@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=3D114693

            Bug ID: 114693
           Summary: `expand` introduce redundant store facing logic
                    expression
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: absoler at smail dot nju.edu.cn
  Target Milestone: ---

A simple case, regression from gcc-5
```
struct S{
    char  f0;
    int  f3;
} s;
int g, f;

void func_1() {
  int a =3D 0;
  s.f0 =3D 1 && ((3 > a) & g);
}
```
compiled with -O2 :

```
func_1():
  401340:       mov    0x10846(%rip),%eax        # 411b8c <g>
  401346:       mov    %al,0x10844(%rip)        # 411b90 <s>
  40134c:       andb   $0x1,0x1083d(%rip)        # 411b90 <s>
  401353:       retq=20=20
```

it seems "1 && " interfere the compiler, after removing it the compiler
generates:
```
func_1():
  401340:       movzbl 0x10845(%rip),%eax        # 411b8c <g>
  401347:       and    $0x1,%eax
  40134a:       mov    %al,0x10840(%rip)        # 411b90 <s>
  401350:       retq=20=20=20
```=