re PR c/62073 (Segmentation fault with tree vectorize)

2014-08-11  Felix Yang  <fei.yang0953@gmail.com>

	PR tree-optimization/62073
	* tree-vect-loop.c (vect_is_simple_reduction_1): Check that DEF1 has
	a basic block.

	* gcc.dg/vect/pr62073.c: New test.

From-SVN: r213812

gcc/ChangeLog

+2014-08-11  Felix Yang  <fei.yang0953@gmail.com>
+
+	PR tree-optimization/62073
+	* tree-vect-loop.c (vect_is_simple_reduction_1): Check that DEF1 has
+	a basic block.
+	
 2014-08-11  Alexander Ivchenko  <alexander.ivchenko@intel.com>
 	    Maxim Kuznetsov  <maxim.kuznetsov@intel.com>
 	    Anna Tikhonova  <anna.tikhonova@intel.com>

gcc/testsuite/ChangeLog

+2014-08-11  Felix Yang  <fei.yang0953@gmail.com>
+
+	PR tree-optimization/62073
+	* gcc.dg/vect/pr62073.c: New test.
+	
 2014-08-11  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/62070

gcc/testsuite/gcc.dg/vect/pr62073.c

+/* { dg-do compile } */
+/* { dg-additional-options "-O1" } */
+
+struct S0
+{
+  int f7;
+};
+struct S0 g_50;
+int g_70;
+int g_76;
+
+int foo (long long p_56, int * p_57)
+{
+  int *l_77;
+  int l_101;
+
+  for (; g_70;)
+    {
+      int **l_78 = &l_77;
+      if (g_50.f7)
+	continue;
+      *l_78 = 0;
+    }
+  for (g_76 = 1; g_76 >= 0; g_76--)
+    {
+      int *l_90;
+      for (l_101 = 4; l_101 >= 0; l_101--)
+	if (l_101)
+	  *l_90 = 0;
+	else
+	  {
+	    int **l_113 = &l_77;
+	    *l_113 = p_57;
+	  }
+    }
+
+  return *l_77;
+}
+
+/* { dg-final { cleanup-tree-dump "vect" } } */

gcc/tree-vect-loop.c

@@ -2321,7 +2321,8 @@ vect_is_simple_reduction_1 (loop_vec_info loop_info, gimple phi,
         }
 
       def1 = SSA_NAME_DEF_STMT (op1);
-      if (flow_bb_inside_loop_p (loop, gimple_bb (def_stmt))
+      if (gimple_bb (def1)
+	  && flow_bb_inside_loop_p (loop, gimple_bb (def_stmt))
           && loop->inner
           && flow_bb_inside_loop_p (loop->inner, gimple_bb (def1))
           && is_gimple_assign (def1))