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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/102133] [12 Regression] ICE in set_rtl building
 libgcc __muldc3 for 32-bit SPARC
Date: Tue, 31 Aug 2021 04:59:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102133

--- Comment #8 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #7)
> Since we also allow something like (concat:(subreg) (subreg)), should we
> also allow subreg outside?
>=20
>    gcc_checking_assert (!x
>  		       || !(TREE_CODE (t) =3D=3D SSA_NAME || is_gimple_reg (t))
>  		       || (use_register_for_decl (t)
> -			   ? (REG_P (x)
> +			   ? (REG_P (x) || SUBREG_P (x)
>  			      || (GET_CODE (x) =3D=3D CONCAT
>  				  && (REG_P (XEXP (x, 0))
>  				      || SUBREG_P (XEXP (x, 0)))
>=20
>=20

It can also fix FAIL: gcc.dg/torture/builtin-attr-1.c   -O1  (internal comp=
iler
error)

for builtin-attr-1.c assembly is the same as the one built without my, but =
for
for __muldc3, there's a little bit difference caused by rtl optimization.=