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 6F4203858C29; Sat, 30 Dec 2023 10:36:48 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6F4203858C29
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1703932608;
	bh=Dtr4/J03D+kpGY5sEh1uMERXnW0wmR6Eq+LkdsDnC3s=;
	h=From:To:Subject:Date:From;
	b=iz+U06h9FK6flZ608S2JUNPA+fR+u4LEAHKX/szNNwYEinLiDELjmAESqfeu0KjF+
	 1T9jFUH/3Jjy/nVfUvJDIOOAaROWLgbYtiLAoEgsMYer84KbsPtk1wUOM26B67qTZv
	 YUPebblGET5BS36oyUZzoFTdVDFtgc6BReRq6BAA=
From: "syq at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113179] New: MIPS
Date: Sat, 30 Dec 2023 10:36:47 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: unknown
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: syq at gcc dot gnu.org
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-113179-4@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=3D113179

            Bug ID: 113179
           Summary: MIPS
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: syq at gcc dot gnu.org
  Target Milestone: ---

```
struct xx {
        int a:4;
        int b:24;
        int c:3;
        int d:1;
};

void xx (struct xx *a, long long b) {
        a->d =3D b;
}
```

When this code is built on -mabi=3D64, it generates asm like this:

```
        lw      $2,0($4)
        ins     $2,$5,31,1
        jr      $31
        sw      $2,0($4)
```

Since the argument B is `long long`, we cannot be sure that it is well
sign-extended, while INS asks for it:

```
If either GPR rs or GPR rt does not contain sign-extended 32-bit values (bi=
ts
63..31 equal), then the result of the operation is UNPREDICTABLE.
```=