--- gforth/extend.fs	2007/01/25 09:11:08	1.58
+++ gforth/extend.fs	2007/03/08 13:55:49	1.59
@@ -50,8 +50,12 @@ decimal
     \G In ANS Forth u3 can only be a positive signed number.
     >r s>d >r abs -rot
     s>d r> xor r> swap >r >r dabs rot tuck um* 2swap um*
-    swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod -rot
-    r> IF IF 1. d+ THEN dnegate ELSE drop THEN ;
+    swap >r 0 d+ r> -rot r@ um/mod -rot r> um/mod
+    [ s" floored" environment? 0= throw ] [if]
+        -rot r> IF IF 1. d+ THEN dnegate ELSE drop THEN
+    [else]
+        nip swap r> IF dnegate THEN
+    [then] ;
 
 \ CASE OF ENDOF ENDCASE                                 17may93jaw