re PR tree-optimization/80632 (error: invalid PHI argument with -O2)

	PR tree-optimization/80632
	* tree-switch-conversion.c (struct switch_conv_info): Add target_vop
	field.
	(build_arrays): Initialize it for virtual phis.
	(fix_phi_nodes): Use it for virtual phis.

	* gcc.dg/pr80632.c: New test.

From-SVN: r247642

gcc/ChangeLog

 2017-05-05  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/80632
+	* tree-switch-conversion.c (struct switch_conv_info): Add target_vop
+	field.
+	(build_arrays): Initialize it for virtual phis.
+	(fix_phi_nodes): Use it for virtual phis.
+
 	PR tree-optimization/80558
 	* tree-vrp.c (extract_range_from_binary_expr_1): Optimize
 	[x, y] op z into [x op, y op z] for op & or | if conditions

gcc/testsuite/ChangeLog

 2017-05-05  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/80632
+	* gcc.dg/pr80632.c: New test.
+
 	PR tree-optimization/80558
 	* gcc.dg/tree-ssa/vrp115.c: New test.
 

gcc/testsuite/gcc.dg/pr80632.c

+/* PR tree-optimization/80632 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+extern int bar (void);
+extern void baz (void);
+int a;
+
+int
+foo (void)
+{
+  int c = 8;
+  if (bar ())
+    {
+      baz ();
+      switch (a)
+	{
+	case 0:
+	  c = 1;
+	  break;
+	case 1:
+	  c = 0;
+	  break;
+	case 2:
+	  c = 0;
+	  break;
+	case 3:
+	  c = 0;
+	  break;
+	default:
+	  c = 1;
+	}
+    }
+  return c;
+}

gcc/tree-switch-conversion.c

@@ -581,6 +581,9 @@ struct switch_conv_info
      switch expression is out of range.  */
   tree *target_outbound_names;
 
+  /* VOP SSA_NAME.  */
+  tree target_vop;
+
   /* The first load statement that loads a temporary from a new static array.
    */
   gimple *arr_ref_first;
@@ -1216,6 +1219,24 @@ build_arrays (gswitch *swtch, struct switch_conv_info *info)
       gphi *phi = gpi.phi ();
       if (!virtual_operand_p (gimple_phi_result (phi)))
 	build_one_array (swtch, i++, arr_index_type, phi, tidx, info);
+      else
+	{
+	  edge e;
+	  edge_iterator ei;
+	  FOR_EACH_EDGE (e, ei, info->switch_bb->succs)
+	    {
+	      if (e->dest == info->final_bb)
+		break;
+	      if (!info->default_case_nonstandard
+		  || e->dest != info->default_bb)
+		{
+		  e = single_succ_edge (e->dest);
+		  break;
+		}
+	    }
+	  gcc_assert (e && e->dest == info->final_bb);
+	  info->target_vop = PHI_ARG_DEF_FROM_EDGE (phi, e);
+	}
     }
 }
 
@@ -1279,7 +1300,7 @@ fix_phi_nodes (edge e1f, edge e2f, basic_block bbf,
       gphi *phi = gsi.phi ();
       tree inbound, outbound;
       if (virtual_operand_p (gimple_phi_result (phi)))
-	inbound = outbound = gimple_vop (cfun);
+	inbound = outbound = info->target_vop;
       else
 	{
 	  inbound = info->target_inbound_names[i];