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From: "bergner 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 19:13:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99041

--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Combiner tries to combine whatever it can and if it matches (and costs
> suggest 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
> ICE is a proof it is not the case.

Ahh, ok.  I can make that more robust.  Thanks for the pointer!=