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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/99041] combine creates invalid address which
 ICEs in decompose_normal_address
Date: Tue, 09 Feb 2021 19:02:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99041

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

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

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Combiner tries to combine whatever it can and if it matches (and costs sugg=
est
it is beneficial) it keeps it.
So, this looks like a target bug to me.
In particular, mma_assemble_input_operand predicate seems to allow any MEM
whatsoever as long as it has V16QImode:
(define_special_predicate "mma_assemble_input_operand"
  (match_test "(mode =3D=3D V16QImode
                && (vsx_register_operand (op, mode) || MEM_P (op)))"))
I don't believe it can allow any, there must be some requirement on what the
address of the MEM can be, whether a REG + REG, REG + offset etc. and the I=
CE
is a proof it is not the case.=