[Bug ipa/64049] [5 Regression] r215898 caused wrong code at -O3

[edlinger at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64049

Bernd Edlinger <edlinger at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |edlinger at gcc dot gnu.org

--- Comment #12 from Bernd Edlinger <edlinger at gcc dot gnu.org> ---
not sure if I even know what I'm doing, but this seems to fix
the test case:

Index: ipa-polymorphic-call.c
===================================================================
--- ipa-polymorphic-call.c    (revision 218433)
+++ ipa-polymorphic-call.c    (working copy)
@@ -1047,7 +1047,8 @@

   if (TREE_CODE (base_pointer) == SSA_NAME
       && SSA_NAME_IS_DEFAULT_DEF (base_pointer)
-      && TREE_CODE (SSA_NAME_VAR (base_pointer)) != PARM_DECL)
+      && TREE_CODE (SSA_NAME_VAR (base_pointer)) != PARM_DECL
+      && TREE_CODE (SSA_NAME_VAR (base_pointer)) != RESULT_DECL)
     {
       invalid = true;
       if (instance)


This line is hit exactly once, but with a RESULT_DECL instead
of a PARM_DECL. setting invalid=true makes the whole thing look so invalid
that it gets replaced by __builtin_unreachable() later on.