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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/109258] [13 Regression]
 go.test/test/fixedbugs/bug207.go ICEs
Date: Thu, 23 Mar 2023 10:10:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109258

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-bisection             |

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
One possible fix is
2023-03-23  Jakub Jelinek  <jakub@redhat.com>

        PR middle-end/109258
        * builtins.cc (inline_expand_builtin_bytecmp): Return NULL_RTX early
        if target =3D=3D const0_rtx.

--- gcc/builtins.cc.jj  2023-03-23 10:00:58.308100548 +0100
+++ gcc/builtins.cc     2023-03-23 11:05:38.308135309 +0100
@@ -7178,8 +7178,8 @@ inline_expand_builtin_bytecmp (tree exp,
   bool is_ncmp =3D (fcode =3D=3D BUILT_IN_STRNCMP || fcode =3D=3D BUILT_IN=
_MEMCMP);

   /* Do NOT apply this inlining expansion when optimizing for size or
-     optimization level below 2.  */
-  if (optimize < 2 || optimize_insn_for_size_p ())
+     optimization level below 2 or if unused *cmp hasn't been DCEd.  */
+  if (optimize < 2 || optimize_insn_for_size_p () || target =3D=3D const0_=
rtx)
     return NULL_RTX;

   gcc_checking_assert (fcode =3D=3D BUILT_IN_STRCMP=