Fix continue prediction for C++

[Jan Hubicka]

Hi,
as noticed by Richard, genericize_continue_stmt doesn't really add the
prediction statement becuase it has no side effects, so we don't do
any continue prediction for C++.

Bootstrapped/regtested x86_64-linux, comitted.

Honza

        * g++.dg/tree-ssa/pred-1.C: New testcase
        * gcc.dg/tree-ssa/pred-1.c: New testcase
        * cp-gimplify.c (genericize_continue_stmt): Force addition of
        predict stmt.

Index: testsuite/g++.dg/tree-ssa/pred-1.C
===================================================================
--- testsuite/g++.dg/tree-ssa/pred-1.C  (revision 0)
+++ testsuite/g++.dg/tree-ssa/pred-1.C  (working copy)
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-profile_estimate" } */
+int a[100];
+void foo(int);
+main()
+{
+  int i;
+  for (i=0;i<100;i++)
+    {
+      if (a[i])
+       continue;
+       foo(i);
+    }
+}
+// { dg-final { scan-tree-dump "continue heuristics" "profile_estimate" } }
Index: testsuite/gcc.dg/tree-ssa/pred-1.c
===================================================================
--- testsuite/gcc.dg/tree-ssa/pred-1.c  (revision 0)
+++ testsuite/gcc.dg/tree-ssa/pred-1.c  (working copy)
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-profile_estimate" } */
+int a[100];
+void foo(int);
+int
+main()
+{
+  int i;
+  for (i=0;i<100;i++)
+    {
+      if (a[i])
+       continue;
+       foo(i);
+    }
+}
+// { dg-final { scan-tree-dump "continue heuristics" "profile_estimate" } }
Index: cp/cp-gimplify.c
===================================================================
--- cp/cp-gimplify.c    (revision 237043)
+++ cp/cp-gimplify.c    (working copy)
@@ -362,7 +362,7 @@ genericize_continue_stmt (tree *stmt_p)
   tree label = get_bc_label (bc_continue);
   location_t location = EXPR_LOCATION (*stmt_p);
   tree jump = build1_loc (location, GOTO_EXPR, void_type_node, label);
-  append_to_statement_list (pred, &stmt_list);
+  append_to_statement_list_force (pred, &stmt_list);
   append_to_statement_list (jump, &stmt_list);
   *stmt_p = stmt_list;
 }