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 C4A053858D32; Mon, 19 Jun 2023 12:51:58 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C4A053858D32
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1687179118;
	bh=QtAV7uLob8GW3wZDog1xIdM72gV1xK83H14IlJoMmag=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=pfqRl1tqEkN/hGokUAD9etMy6t0v1+MD2fwug0T4P3dJNmNvY03vlcO2czmah+adN
	 x+DPD1vsea96AUaJw4Er2w3wNXFhlCnKbnXQ3yL5XV0QeZViUDWMneR/Eja8TBl+Fc
	 CA6BJoO4F6fYrGrHJv5WvnaDU9zUGkRYatGCNjp8=
From: "m.cencora at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110303] With -O0, _mm_shuffle_epi32 with a constexpr
 function argument does not compile
Date: Mon, 19 Jun 2023 12:51:58 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 13.2.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: m.cencora at gmail dot com
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: DUPLICATE
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: cc
Message-ID: <bug-110303-4-A4erE9MqvG@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110303-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110303-4@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=3D110303

m.cencora at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |m.cencora at gmail dot com

--- Comment #6 from m.cencora at gmail dot com ---
(In reply to Denis Yaroshevskiy from comment #4)
> > so _mm_shuffle_epi32 requires a constant but since it is an argument, t=
he argument, it is not a constant expression requirement.
>=20
> The function is marked constexpr. So it can be a constant if you ask it.

constexpr at function declaration means that it COULD be evaluated in compi=
le
time, but doesn't force it.

To force it either invoke it in a context that requires a compile-time
evaluation (e.g. static_assert, or initializer of constexpr variable), or m=
ark
it as consteval instead.=