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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/102133] [12 Regression] ICE in set_rtl building
 libgcc __muldc3 for 32-bit SPARC
Date: Tue, 31 Aug 2021 03:29:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102133

--- Comment #7 from Hongtao.liu <crazylht at gmail dot com> ---
Since we also allow something like (concat:(subreg) (subreg)), should we al=
so
allow subreg outside?

   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)))


The below code also looks like it's going to handle SUBREG.

  if (x)
    {
      bool skip =3D false;
      tree cur =3D NULL_TREE;
      rtx xm =3D x;

    retry:
      if (MEM_P (xm))
        cur =3D MEM_EXPR (xm);
      else if (REG_P (xm))
        cur =3D REG_EXPR (xm);
      else if (SUBREG_P (xm))
        {
          gcc_assert (subreg_lowpart_p (xm));
          xm =3D SUBREG_REG (xm);
          goto retry;=