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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97521] [11 Regression] wrong code with -mno-sse2 since
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Date: Thu, 22 Oct 2020 08:52:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97521

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Well, I think it is certainly desirable to keep using VEC_MERGE, not only
because it is less IL.
But pedantically already what i386 backend does doesn't match the documenta=
tion
which says that the last operand of VEC_MERGE is a CONST_INT.
We could just say that it is either a CONST_INT, or an RTL expression with a
scalar integral mode, or V*BImode mode.
And another question is how to represent the V*BImode constants, whether to
represent them as normal VOIDmode CONST_INTs, or something else
(const_vector:V*BI ...).=