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 C39013858D39; Thu, 18 Apr 2024 07:47:12 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C39013858D39
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1713426432;
	bh=yAkVYWQA/CoVJT5FSRSpeVW3FNDlCXYzJxNh2KvurNM=;
	h=From:To:Subject:Date:From;
	b=NvBCGp4g/hYZnkThBA/lRwJcSPDRTgzC1EYPydifQ33iWVsVwlKzAzf1il49uz0UC
	 L8yJ0a9toCKjFfvvaPPs7su4LbZVbGhOFy08aReOYAr0w58bAdEGIKVxCZO9+Ew9FZ
	 bytu1nylxT3VCwBKMkLWsPqH9SG1LBdGYmXu7gao=
From: "hanwei62 at huawei dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/114763] New: Wduplicated-branches just check last else
 if-else case?
Date: Thu, 18 Apr 2024 07:47:12 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hanwei62 at huawei 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: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-114763-4@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=3D114763

            Bug ID: 114763
           Summary: Wduplicated-branches just check last else if-else
                    case?
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hanwei62 at huawei dot com
  Target Milestone: ---

This code:

void foo(int x) {
    if (x) {
        x -=3D 2;
    } else if (x > 50) {
        x -=3D 2;
    } else
        x +=3D 2;
}

# gcc -c test.c -Wduplicated-branches

not warning, even if-else if branches is same.

void foo(int x) {
    if (x) {
        x -=3D 2;
    } else if (x > 50) {
        x -=3D 2;
    } else if (x < 20) {
        x +=3D 2;
    } else {
        x +=3D 2;
    }
}

warning.

Same like https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D85094

What I find that Wduplicated-branches just check the last `else if-else`
branches.

https://godbolt.org/z/WP8v5P4Yf

It's misleading.=