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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114801] [14/15 Regression] arm: ICE in
 find_cached_value, at rtx-vector-builder.cc:100 with MVE intrinsics
Date: Fri, 26 Apr 2024 13:52:25 +0000
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X-Bugzilla-Keywords: ice-on-valid-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114801

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #5)
> So (completely untested):
> --- gcc/config/arm/arm-mve-builtins.cc.jj	2024-03-19 09:51:05.203631194 +=
0100
> +++ gcc/config/arm/arm-mve-builtins.cc	2024-04-26 15:49:55.380344060 +0200
> @@ -2100,7 +2100,12 @@ function_expander::add_input_operand (in
>        mode =3D GET_MODE (x);
>      }
>    else if (VALID_MVE_PRED_MODE (mode))
> -    x =3D gen_lowpart (mode, x);
> +    {
> +      if (mode =3D=3D HImode && GET_MODE (x) !=3D HImode)
> +	/* GCC promotes QI/HImode arguments to int, undo that
> +	   here.  */
> +	x =3D lowpart_subreg (mode, x, SImode);

Perhaps even
      else
        gcc_assert (GET_MODE (x) =3D=3D mode);
here?=