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 3D52F3857C5E; Fri,  2 Feb 2024 15:24:24 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3D52F3857C5E
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1706887464;
	bh=E7hUGxoH46WkRpyhK0SIakKPnNOTDxQX3QCdBl02CZg=;
	h=From:To:Subject:Date:From;
	b=VGCr0ab94/9jB3uUIz5j1Vr5SfhZ+9bU+zCS00UzyBrrPNOuEQNncE6E1Is7h8TzG
	 gYw4wNrTxERkMuIc+1V3KwdNtfqLSQEFYKc19bRXt/9ZOvm4u3zL0R17vpHpILbm2F
	 qPDFvKxa119UKLQ5RKhJ9+yQLRlPkCIzcCE9nbWE=
From: "bouanto at zoho dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug regression/113722] New: Folding of __builtin_bswap128 doesn't
 work anymore
Date: Fri, 02 Feb 2024 15:24:23 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: regression
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: bouanto at zoho 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-113722-4@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=3D113722

            Bug ID: 113722
           Summary: Folding of __builtin_bswap128 doesn't work anymore
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bouanto at zoho dot com
  Target Milestone: ---

With the following code:

#include <stdio.h>

int main(int argc, char* argv[]) {
    __uint128_t res =3D __builtin_bswap128 (2);
    printf("Value: %ld\n", res >> 64);
    res =3D __builtin_bswap128 (argc + 1);
    printf("Value: %ld\n", res >> 64);
}

it gives the following output in gcc 13.2.1:

Value: 144115188075855872
Value: 144115188075855872

while it gives the following output in the master branch, commit
2c27aa8d75113f404bf9cd39364611af386d9719:

Value: 0
Value: 144115188075855872

So it seems to be a regression in the folding of wide_int::bswap.=