re PR tree-optimization/78692 (ICE (segfault))

	PR c++/78692
	* cgraph.c (cgraph_edge::redirect_call_stmt_to_callee): Set lhs
	var to lhs of new_stmt right before noreturn handling rather than to
	lhs of e->call_stmt early.

	* g++.dg/torture/pr78692.C: New test.

From-SVN: r243377

gcc/ChangeLog

+2016-12-07  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/78692
+	* cgraph.c (cgraph_edge::redirect_call_stmt_to_callee): Set lhs
+	var to lhs of new_stmt right before noreturn handling rather than to
+	lhs of e->call_stmt early.
+
 2016-12-07  David Malcolm  <dmalcolm@redhat.com>
 
 	* read-md.c (rtx_reader::require_char): New method.

gcc/cgraph.c

@@ -1271,7 +1271,6 @@ cgraph_edge::redirect_call_stmt_to_callee (void)
   cgraph_edge *e = this;
 
   tree decl = gimple_call_fndecl (e->call_stmt);
-  tree lhs = gimple_call_lhs (e->call_stmt);
   gcall *new_stmt;
   gimple_stmt_iterator gsi;
   bool skip_bounds = false;
@@ -1526,6 +1525,7 @@ cgraph_edge::redirect_call_stmt_to_callee (void)
     gimple_call_set_fntype (new_stmt, TREE_TYPE (e->callee->decl));
 
   /* If the call becomes noreturn, remove the LHS if possible.  */
+  tree lhs = gimple_call_lhs (new_stmt);
   if (lhs
       && gimple_call_noreturn_p (new_stmt)
       && (VOID_TYPE_P (TREE_TYPE (gimple_call_fntype (new_stmt)))

gcc/testsuite/ChangeLog

+2016-12-07  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/78692
+	* g++.dg/torture/pr78692.C: New test.
+
 2016-12-07  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	PR rtl-optimization/78617

gcc/testsuite/g++.dg/torture/pr78692.C

+// PR c++/78692
+
+int a;
+void *b;
+extern "C" {
+struct C {
+  virtual int d ();
+};
+struct E {
+  virtual int operator () (int, const void *, int) = 0;
+};
+class F {
+  int g ();
+  int h;
+  E &i;
+};
+struct : C, E {
+  int operator () (int, const void *, int) { throw int(); }
+} j;
+
+int
+F::g ()
+{
+  a = i (h, b, 0);
+}
+}