re PR middle-end/46885 (ICE: in gsi_insert_seq_nodes_after, at…

re PR middle-end/46885 (ICE: in gsi_insert_seq_nodes_after, at gimple-iterator.c:251 with -ftree-parallelize-loops -g)

	PR debug/46885
	* tree-ssa-loop-manip.c (canonicalize_loop_ivs): Use gsi_last_bb
	instead of gsi_last_nondebug_bb if bump_in_latch.

	* gcc.dg/autopar/pr46885.c: New test.

From-SVN: r167801

gcc/ChangeLog

 2010-12-14  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/46885
+	* tree-ssa-loop-manip.c (canonicalize_loop_ivs): Use gsi_last_bb
+	instead of gsi_last_nondebug_bb if bump_in_latch.
+
 	PR tree-optimization/46909
 	* gimple-fold.c (and_var_with_comparison_1): Save partial
 	result even in the is_and case, if both partial results

gcc/testsuite/ChangeLog

 2010-12-14  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/46885
+	* gcc.dg/autopar/pr46885.c: New test.
+
 	PR tree-optimization/46909
 	* gcc.c-torture/execute/pr46909-1.c: New test.
 	* gcc.c-torture/execute/pr46909-2.c: New test.

gcc/testsuite/gcc.dg/autopar/pr46885.c

+/* PR debug/46885 */
+/* { dg-do compile } */
+/* { dg-options "-O -ftree-parallelize-loops=4 -fcompare-debug -fno-tree-dominator-opts -funswitch-loops" } */
+
+static inline void
+bar (int i)
+{
+  (void) i;
+}
+
+int
+foo (int *begin, int *end)
+{
+  int s = 0;
+  int *i;
+  for (i = begin; i != end; ++i)
+    {
+      bar (0);
+      if (begin)
+	return s;
+    }
+  return 0;
+}

gcc/tree-ssa-loop-manip.c

@@ -1221,7 +1221,10 @@ canonicalize_loop_ivs (struct loop *loop, tree *nit, bool bump_in_latch)
 	gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts);
     }
 
-  gsi = gsi_last_nondebug_bb (bump_in_latch ? loop->latch : loop->header);
+  if (bump_in_latch)
+    gsi = gsi_last_bb (loop->latch);
+  else
+    gsi = gsi_last_nondebug_bb (loop->header);
   create_iv (build_int_cst_type (type, 0), build_int_cst (type, 1), NULL_TREE,
 	     loop, &gsi, bump_in_latch, &var_before, NULL);