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From: "xry111 at gcc dot gnu.org" <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 12:30:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110303

Xi Ruoyao <xry111 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |xry111 at gcc dot gnu.org

--- Comment #5 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
(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.

The problem is -O0 means "don't ask it".  Constant propagation is an
optimization, but -O0 means don't do optimization.=