re PR tree-optimization/31383 (ICE with -O2 -ftree-vectorize (regression))

	PR tree-optimization/31383
	* tree-data-ref.c (affine_function_equal_p): Do not require the vectors
	to have the same length.

From-SVN: r123359

gcc/ChangeLog

+2007-03-30  Zdenek Dvorak  <dvorakz@suse.cz>
+
+	PR tree-optimization/31383
+	* tree-data-ref.c (affine_function_equal_p): Do not require the vectors
+	to have the same length.
+
 2007-03-30  Jan Hubicka  <jh@suse.cz>
 
 	PR middle-end/PR30700

gcc/tree-data-ref.c

@@ -2069,7 +2069,8 @@ affine_function_equal_p (affine_fn fna, affine_fn fnb)
 {
   unsigned i, n = VEC_length (tree, fna);
 
-  gcc_assert (n == VEC_length (tree, fnb));
+  if (n != VEC_length (tree, fnb))
+    return false;
 
   for (i = 0; i < n; i++)
     if (!operand_equal_p (VEC_index (tree, fna, i),