re PR tree-optimization/56366 (ICE: verify_gimple failed (incompatible types in PHI argument))

2013-02-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/56366
	* tree-vect-loop.c (get_initial_def_for_induction): Properly
	handle sign-conversion of outer-loop initial induction value.

	* gcc.dg/torture/pr56366.c: New testcase.

From-SVN: r196121

gcc/ChangeLog

 2013-02-18  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/56366
+	* tree-vect-loop.c (get_initial_def_for_induction): Properly
+	handle sign-conversion of outer-loop initial induction value.
+
+2013-02-18  Richard Biener  <rguenther@suse.de>
+
 	PR middle-end/56349
 	* cfghooks.c (merge_blocks): If we merge a latch into another
 	block adjust references to it.

gcc/testsuite/ChangeLog

 2013-02-18  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/56366
+	* gcc.dg/torture/pr56366.c: New testcase.
+
+2013-02-18  Richard Biener  <rguenther@suse.de>
+
 	PR middle-end/56349
 	* gcc.dg/torture/pr56349.c: New testcase.
 

gcc/testsuite/gcc.dg/torture/pr56366.c

+/* { dg-do compile } */
+
+int a, *c, d;
+unsigned short b;
+short e;
+
+void f(void)
+{
+  for(;; d++)
+    {
+      for(a = -9; a < 63; a++)
+	for(d = 0; d < 9; d++)
+	  b -= --e;
+
+      a = b & *c;
+    }
+}

gcc/tree-vect-loop.c

@@ -3203,6 +3203,21 @@ get_initial_def_for_induction (gimple iv_phi)
       tree iv_def = PHI_ARG_DEF_FROM_EDGE (iv_phi,
                                            loop_preheader_edge (iv_loop));
       vec_init = vect_get_vec_def_for_operand (iv_def, iv_phi, NULL);
+      /* If the initial value is not of proper type, convert it.  */
+      if (!useless_type_conversion_p (vectype, TREE_TYPE (vec_init)))
+	{
+	  new_stmt = gimple_build_assign_with_ops
+	      (VIEW_CONVERT_EXPR,
+	       vect_get_new_vect_var (vectype, vect_simple_var, "vec_iv_"),
+	       build1 (VIEW_CONVERT_EXPR, vectype, vec_init), NULL_TREE);
+	  vec_init = make_ssa_name (gimple_assign_lhs (new_stmt), new_stmt);
+	  gimple_assign_set_lhs (new_stmt, vec_init);
+	  new_bb = gsi_insert_on_edge_immediate (loop_preheader_edge (iv_loop),
+						 new_stmt);
+	  gcc_assert (!new_bb);
+	  set_vinfo_for_stmt (new_stmt,
+			      new_stmt_vec_info (new_stmt, loop_vinfo, NULL));
+	}
     }
   else
     {