--- gforth/float.fs	2007/12/31 18:40:24	1.53
+++ gforth/float.fs	2010/03/22 17:08:06	1.57
@@ -1,6 +1,6 @@
 \ High level floating point                            14jan94py
 
-\ Copyright (C) 1995,1997,2003,2004,2005,2006,2007 Free Software Foundation, Inc.
+\ Copyright (C) 1995,1997,2003,2004,2005,2006,2007,2009 Free Software Foundation, Inc.
 
 \ This file is part of Gforth.
 
@@ -233,14 +233,23 @@ set-current
 	fnegate f~rel
     THEN ;
 
+-0e 8 0 [do] fp@ [i] + c@ $80 = [if] [i] constant fsign-offset [then] [loop]
+
+: fcopysign ( r1 r2 -- r3 ) \ gforth
+\G r3 takes its absolute value from r1 and its sign from r2
+    \ !! implementation relies on IEEE DP format
+    fp@ fsign-offset + dup c@ $80 and >r ( r1 r2 addr-r1sign )
+    float+ dup c@ $7f and r> or swap c!
+    fdrop ;
+
 \ proposals from Krishna Myeni in <cjsp2d$47l$1@ngspool-d02.news.aol.com>
 \ not sure if they are a good idea
 
-: FTRUNC ( r1 -- r2 )
+: ftrunc ( r1 -- r2 ) \ X:ftrunc
     \ round towards 0
-    \ !! should be implemented properly
-    F>D D>F ;
+    fdup fabs floor fswap fcopysign ;
 
 : FMOD ( r1 r2 -- r )
     \ remainder of r1/r2
     FOVER FOVER F/ ftrunc F* F- ;
+