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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98648] Failure to optimize out no-op vector operation
 using andnot
Date: Thu, 14 Jan 2021 11:16:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98648

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I guess the reason why simplify-rtx.c doesn't optimize it is that these
patterns really don't have valid RTL, bitwise and/or/xor/andnot are expecte=
d to
have integral or integral vector arguments, not floating point vector.
Don't know if we couldn't e.g. represent these as
(set (match_operand:V4SF 0)
     (subreg:V4SF
       (and:V4SI (subreg:V4SI (match_operand:V4SF 1) 0)
                 (subreg:V4SI (match_operand:V4SF 2) 0)) 0))
etc.=