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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/105554] [10/11/12/13 Regression] ICE: in
 emit_block_move_hints, at expr.cc:1829 since r9-5509-g5928bc2ec06dd4e7
Date: Wed, 11 Jan 2023 13:01:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105554

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #6)
> We fail in the param assignment:
>=20
> (gdb) pp x
> (reg:V4DI 82)
> (gdb) pp y
> (mem/c:BLK (reg/f:DI 76 virtual-incoming-args) [1 x+0 S32 A256])
>=20
> So we will likely need something similar to what we have in tree-inline.c=
c:
>=20
>   5928    /* For vector typed decls make sure to update DECL_MODE accordi=
ng
>   5929       to the new function context.  */
>   5930    if (VECTOR_TYPE_P (TREE_TYPE (copy)))
>   5931      SET_DECL_MODE (copy, TYPE_MODE (TREE_TYPE (copy)));
>=20
> @Richi: Do you have a clue where to adjust it?

I think it goes wrong in use_register_for_decl (called from
assign_parm_setup_block).

diff --git a/gcc/function.cc b/gcc/function.cc
index d975b001ec9..b54f9b33c6a 100644
--- a/gcc/function.cc
+++ b/gcc/function.cc
@@ -2229,7 +2229,9 @@ use_register_for_decl (const_tree decl)
     }

   /* Only register-like things go in registers.  */
-  if (DECL_MODE (decl) =3D=3D BLKmode)
+  if (DECL_MODE (decl) =3D=3D BLKmode
+      || (VECTOR_TYPE_P (TREE_TYPE (decl))
+         && TYPE_MODE (TREE_TYPE (decl)) =3D=3D BLKmode))
     return false;

   /* If -ffloat-store specified, don't put explicit float variables

fixes the ICE, not sure if we should adjust the PARM_DECLs mode somewhere
in target cloning instead though?=