diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 881f157122f..f807935067f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2005-02-21  Eric Botcazou  <ebotcazou@libertysurf.fr>
+
+	PR tree-optimization/18663
+	* tree-ssa-dom.c (extract_range_from_cond): Return 0
+	if the type has variable bounds.
+
 2005-02-20  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* gcse.c: Remove an obsolete comment.
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c
index 0d34ea22fcf..88c7f92fd4b 100644
--- a/gcc/tree-ssa-dom.c
+++ b/gcc/tree-ssa-dom.c
@@ -3189,16 +3189,19 @@ extract_range_from_cond (tree cond, tree *hi_p, tree *lo_p, int *inverted_p)
   tree op1 = TREE_OPERAND (cond, 1);
   tree high, low, type;
   int inverted;
-  
+
+  type = TREE_TYPE (op1);
+
   /* Experiments have shown that it's rarely, if ever useful to
      record ranges for enumerations.  Presumably this is due to
      the fact that they're rarely used directly.  They are typically
      cast into an integer type and used that way.  */
-  if (TREE_CODE (TREE_TYPE (op1)) != INTEGER_TYPE)
+  if (TREE_CODE (type) != INTEGER_TYPE
+      /* We don't know how to deal with types with variable bounds.  */
+      || TREE_CODE (TYPE_MIN_VALUE (type)) != INTEGER_CST
+      || TREE_CODE (TYPE_MAX_VALUE (type)) != INTEGER_CST)
     return 0;
 
-  type = TREE_TYPE (op1);
-
   switch (TREE_CODE (cond))
     {
     case EQ_EXPR: