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 F2F75385842A; Fri,  2 Jun 2023 00:56:08 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F2F75385842A
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1685667368;
	bh=Xl/tjQHNcgUZ5N9MIz1GGMPD92QLmG85kpaTly3jYYQ=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=vOd9OjZxHEm0VmA+qdi45n3UTLOxENIJMOWcew9S4CI2rzpReX5bsDe2Oq3eAjoPY
	 wLJGrlW2SRYvmeb3Jm0Xg/fRysRAIMqv28YTYCqibBzM9kYkUcZaPycak1P0MhpC98
	 M5LQehXL9jfQlOyCy7Volu/HzALS3tkmepJ27sjI=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/40987] ifcvt sometimes goes wrong for integer
 modes > 64bit
Date: Fri, 02 Jun 2023 00:56:08 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 4.3.4
X-Bugzilla-Keywords: patch, wrong-code
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-40987-4-U9HNnnUmg2@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-40987-4@http.gcc.gnu.org/bugzilla/>
References: <bug-40987-4@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=3D40987

--- Comment #13 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is a x86_64-linux-gnu testcase:
```
#include <stdio.h>

typedef __int128_t mytype;
#define value (((__int128_t)(((unsigned long long)__LONG_LONG_MAX__)+1)) |
(((__int128_t)0xffffffffffffffffull)<<64))

mytype func(long arg) __attribute__((noinline,noclone));
mytype func(long arg) {
   mytype val =3D 0;
   if (arg < 0) {
    // __int128_t t =3D 0x8000000000000000ull |
(((__int128_t)0xffffffffffffffff)<<64);
      val =3D value;
   }
   return val;
}

int main() {
   mytype result =3D func(-1);
   if (result !=3D value) {
      printf("failed.\n");
      return 1;
   }=20
   printf("passed.\n");
   return 0;
}
```

It failed until GCC 4.9.0=