re PR tree-optimization/23853 (ICE: in tree_low_cst, at tree.c:4270)

2005-09-28  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/23853
	* tree-vect-analyze.c (vect_compute_data_ref_alignment): Use
	host_integerp to verify misalignment value.

From-SVN: r104743

gcc/ChangeLog

+2005-09-28  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/23853
+	* tree-vect-analyze.c (vect_compute_data_ref_alignment): Use
+	host_integerp to verify misalignment value.
+
 2005-09-28  Richard Henderson  <rth@redhat.com>
 
 	* builtins.c (get_builtin_sync_mode): New.

gcc/tree-vect-analyze.c

@@ -773,15 +773,15 @@ vect_compute_data_ref_alignment (struct data_reference *dr)
   /* Modulo alignment.  */
   misalign = size_binop (TRUNC_MOD_EXPR, misalign, alignment);
 
-  if (tree_int_cst_sgn (misalign) < 0)
+  if (!host_integerp (misalign, 1))
     {
-      /* Negative misalignment value.  */
+      /* Negative or overflowed misalignment value.  */
       if (vect_print_dump_info (REPORT_DETAILS))
 	fprintf (vect_dump, "unexpected misalign value");
       return false;
     }
 
-  DR_MISALIGNMENT (dr) = tree_low_cst (misalign, 1);
+  DR_MISALIGNMENT (dr) = TREE_INT_CST_LOW (misalign);
 
   if (vect_print_dump_info (REPORT_DETAILS))
     {