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 3768A3857C52; Tue, 13 Feb 2024 22:33:46 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3768A3857C52
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1707863626;
	bh=P2xoW6gvgTK4Mswwcw0kKbPNHZzB5eeM0Wo7+LmXuOE=;
	h=From:To:Subject:Date:From;
	b=n+AOBWxdhJSv0BWL6Nf1mx1fbzIKUfFky/HP+t+UOFDQXaPR0JG6NXOjX5+GEGw/p
	 3rgWWVo0/VeyIEcqKeaifLO6MTEkGscmkpracYFRlYSDjmVod32d6tUxg3wNRjbwrb
	 XPZDLnSPjHT+VnDwJqs4AvD16KzaKLOxULXfF2f4=
From: "ewlu at rivosinc dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113913] New: [14] RISC-V: suboptimal code gen for
 intrinsic vcreate
Date: Tue, 13 Feb 2024 22:33:45 +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: 14.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ewlu at rivosinc 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-113913-4@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=3D113913

            Bug ID: 113913
           Summary: [14] RISC-V: suboptimal code gen for intrinsic vcreate
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ewlu at rivosinc dot com
  Target Milestone: ---

godbolt: https://godbolt.org/z/svPsddaTd

Functions like=20

vfloat16m2_t
test_vcreate_v_f16m1_f16m2 (vfloat16m1_t v0, vfloat16m1_t v1)
{
  return __riscv_vcreate_v_f16m1_f16m2 (v0, v1);
}

are generating code like

test_vcreate_v_f16m1_f16m2:
        vmv1r.v v11,v8
        vmv1r.v v10,v9
        vmv1r.v v8,v11
        vmv1r.v v9,v10
        ret

which should be optimized away into a nop like later functions in the testc=
ase

test_vcreate_v_i64m2_i64m8:
        ret=