2013-09-20 Richard Biener <rguenther@suse.de>

	PR middle-end/58473
	* tree-chrec.h (build_polynomial_chrec): Use gcc_checking_assert,
	make type comparison less strict.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@202774 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 10 insertions, 7 deletions

diff --git a/gcc/tree-chrec.h b/gcc/tree-chrec.h
index ad39a6b22d3..c69183b966e 100644
--- a/gcc/tree-chrec.h
+++ b/gcc/tree-chrec.h
@@ -137,15 +137,18 @@ build_polynomial_chrec (unsigned loop_num,
       || !val)
     return chrec_dont_know;
 
-  /* Pointer types should occur only on the left hand side, i.e. in
-     the base of the chrec, and not in the step.  */
-  gcc_assert (!POINTER_TYPE_P (TREE_TYPE (right)));
-
-  /* Types of left and right sides of a chrec should be compatible.  */
+  /* Types of left and right sides of a chrec should be compatible, but
+     pointer CHRECs are special in that the evolution is of ptroff type.  */
   if (POINTER_TYPE_P (TREE_TYPE (left)))
-    gcc_assert (ptrofftype_p (TREE_TYPE (right)));
+    gcc_checking_assert (ptrofftype_p (TREE_TYPE (right)));
   else
-    gcc_assert (TREE_TYPE (left) == TREE_TYPE (right));
+    {
+      /* Pointer types should occur only on the left hand side, i.e. in
+	 the base of the chrec, and not in the step.  */
+      gcc_checking_assert (!POINTER_TYPE_P (TREE_TYPE (right))
+			   && types_compatible_p (TREE_TYPE (left),
+						  TREE_TYPE (right)));
+    }
 
   if (chrec_zerop (right))
     return left;