[PATCH] Fix another case of noreturn call with TREE_ADDRESSABLE type on lhs (PR c++/71100)

[Jakub Jelinek]

Hi!

In 6+ we require that lhs is present if the return type of a call is
TREE_ADDRESSABLE, apparently this function has been missed.

Fixed thusly, bootstrapped/regtested (at r236371, later trunk fails
miserably on both x86_64-linux and i686-linux), ok for trunk/6.2?

2016-05-18  Jakub Jelinek  <ja...@redhat.com>

        PR c++/71100
        * cgraph.c (cgraph_edge::redirect_call_stmt_to_callee): Don't drop
        lhs if it has TREE_ADDRESSABLE type.

        * g++.dg/opt/pr71100.C: New test.

--- gcc/cgraph.c.jj     2016-05-16 18:53:43.000000000 +0200
+++ gcc/cgraph.c        2016-05-18 10:53:39.491189469 +0200
@@ -1515,7 +1515,8 @@ cgraph_edge::redirect_call_stmt_to_calle
   /* If the call becomes noreturn, remove the LHS if possible.  */
   if (lhs
       && (gimple_call_flags (new_stmt) & ECF_NORETURN)
-      && TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (lhs))) == INTEGER_CST)
+      && TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (lhs))) == INTEGER_CST
+      && !TREE_ADDRESSABLE (TREE_TYPE (lhs)))
     {
       if (TREE_CODE (lhs) == SSA_NAME)
        {
--- gcc/testsuite/g++.dg/opt/pr71100.C.jj       2016-05-18 10:56:12.798070065 
+0200
+++ gcc/testsuite/g++.dg/opt/pr71100.C  2016-05-18 10:56:07.974136754 +0200
@@ -0,0 +1,18 @@
+// PR c++/71100
+// { dg-do compile }
+// { dg-options "-O2" }
+
+struct D { ~D (); };
+struct E { D foo () { throw 1; } };
+
+inline void
+bar (D (E::*f) (), E *o)
+{
+  (o->*f) ();
+}
+
+void
+baz (E *o)
+{
+  bar (&E::foo, o);
+}

        Jakub