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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 02:04:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102133

--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> ---
static inline void
set_rtl (tree t, rtx x)
{
  gcc_checking_assert (!x
                       || !(TREE_CODE (t) =3D=3D SSA_NAME || is_gimple_reg =
(t))
                       || (use_register_for_decl (t)
                           ? (REG_P (x)
                              || (GET_CODE (x) =3D=3D CONCAT
                                  && (REG_P (XEXP (x, 0))
                                      || SUBREG_P (XEXP (x, 0)))
                                  && (REG_P (XEXP (x, 1))
                                      || SUBREG_P (XEXP (x, 1))))
                              /* We need to accept PARALLELs for RESUT_DECLs
                                 because of vector types with BLKmode retur=
ned
                                 in multiple registers, but they are suppos=
ed
                                 to be uncoalesced.  */
                              || (GET_CODE (x) =3D=3D PARALLEL
                                  && SSAVAR (t)
                                  && TREE_CODE (SSAVAR (t)) =3D=3D RESULT_D=
ECL
                                  && (GET_MODE (x) =3D=3D BLKmode
                                      || !flag_tree_coalesce_vars)))
                           : (MEM_P (x) || x =3D=3D pc_rtx
                              || (GET_CODE (x) =3D=3D CONCAT
                                  && MEM_P (XEXP (x, 0))
                                  && MEM_P (XEXP (x, 1))))));


x is=20
(subreg:DF (reg:DI 154) 0),

t is=20
 <ssa_name 0x7fffea4a9a68
    type <real_type 0x7fffea48b1f8 DFtype sizes-gimplified DF
        size <integer_cst 0x7fffea2e2e10 constant 64>
        unit-size <integer_cst 0x7fffea2e2e28 constant 8>
        align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffea2f9498 precision:64 context <translation_unit_decl 0x7fffea49c078
/scratch/jmyers/glibc/many12/src/gcc/libgcc/libgcc2.c>>
    visited var <parm_decl 0x7fffea497b00 d>
    def_stmt GIMPLE_NOP
    version:62>

and it hit REG_P (XEXP (x, 1)), XEXP (x, 1) is invalid for subreg, so set_r=
tl=20
here doesn't accept subreg?=