use math.bitwise here, add a couple tests

extra/math/floating-point/floating-point-tests.factor

@@ -1,4 +1,7 @@
 ! Copyright (C) 2008 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: tools.test math.floating-point ;
+USING: tools.test math.floating-point math.constants kernel ;
 IN: math.floating-point.tests
+
+[ t ] [ pi >double< >double pi = ] unit-test
+[ t ] [ -1.0 >double< >double -1.0 = ] unit-test

extra/math/floating-point/floating-point.factor

@@ -1,20 +1,20 @@
 ! Copyright (C) 2008 Doug Coleman.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: kernel math sequences prettyprint math.parser io
-math.functions ;
+math.functions math.bitwise ;
 IN: math.floating-point
 
 : (double-sign) ( bits -- n ) -63 shift ; inline
 : double-sign ( double -- n ) double>bits (double-sign) ;
 
 : (double-exponent-bits) ( bits -- n )
-    -52 shift 11 2^ 1- bitand ; inline
+    -52 shift 11 on-bits mask ; inline
 
 : double-exponent-bits ( double -- n )
     double>bits (double-exponent-bits) ;
 
 : (double-mantissa-bits) ( double -- n )
-    52 2^ 1- bitand ;
+    52 on-bits mask ;
 
 : double-mantissa-bits ( double -- n )
     double>bits (double-mantissa-bits) ;
@@ -37,4 +37,3 @@ IN: math.floating-point
         (double-mantissa-bits) >bin 52 CHAR: 0 pad-left
         11 [ bl ] times print
     ] tri ;
-