-! Copyright (C) 2004, 2006 Slava Pestov.
+! Copyright (C) 2004, 2009 Slava Pestov, Joe Groff.
! See http://factorcode.org/license.txt for BSD license.
USING: kernel math math.private ;
IN: math.floats.private
M: float mod float-mod ; inline
M: real abs dup 0 < [ neg ] when ; inline
+
+M: float fp-special?
+ double>bits -52 shift HEX: 7ff [ bitand ] keep = ; inline
+
+M: float fp-nan-payload
+ double>bits 52 2^ 1 - bitand ; inline
+
+M: float fp-nan?
+ dup fp-special? [ fp-nan-payload zero? not ] [ drop f ] if ; inline
+
+M: float fp-qnan?
+ dup fp-nan? [ fp-nan-payload 51 2^ bitand zero? not ] [ drop f ] if ; inline
+
+M: float fp-snan?
+ dup fp-nan? [ fp-nan-payload 51 2^ bitand zero? ] [ drop f ] if ; inline
+
+M: float fp-infinity?
+ dup fp-special? [ fp-nan-payload zero? ] [ drop f ] if ; inline
+
+M: float next-float ( m -- n )
+ double>bits
+ dup -0.0 double>bits > [ 1 - bits>double ] [ ! negative non-zero
+ dup -0.0 double>bits = [ drop 0.0 ] [ ! negative zero
+ 1 + bits>double ! positive
+ ] if
+ ] if ; inline
+
+M: float prev-float ( m -- n )
+ double>bits
+ dup -0.0 double>bits >= [ 1 + bits>double ] [ ! negative
+ dup 0.0 double>bits = [ drop -0.0 ] [ ! positive zero
+ 1 - bits>double ! positive non-zero
+ ] if
+ ] if ; inline
GENERIC: fp-infinity? ( x -- ? )
GENERIC: fp-nan-payload ( x -- bits )
-M: object fp-special?
- drop f ; inline
-M: object fp-nan?
- drop f ; inline
-M: object fp-qnan?
- drop f ; inline
-M: object fp-snan?
- drop f ; inline
-M: object fp-infinity?
- drop f ; inline
-M: object fp-nan-payload
- drop f ; inline
-
-M: float fp-special?
- double>bits -52 shift HEX: 7ff [ bitand ] keep = ; inline
-
-M: float fp-nan-payload
- double>bits HEX: fffffffffffff bitand ; inline
-
-M: float fp-nan?
- dup fp-special? [ fp-nan-payload zero? not ] [ drop f ] if ; inline
-
-M: float fp-qnan?
- dup fp-nan? [ fp-nan-payload HEX: 8000000000000 bitand zero? not ] [ drop f ] if ; inline
-
-M: float fp-snan?
- dup fp-nan? [ fp-nan-payload HEX: 8000000000000 bitand zero? ] [ drop f ] if ; inline
-
-M: float fp-infinity?
- dup fp-special? [ fp-nan-payload zero? ] [ drop f ] if ; inline
+M: object fp-special? drop f ; inline
+M: object fp-nan? drop f ; inline
+M: object fp-qnan? drop f ; inline
+M: object fp-snan? drop f ; inline
+M: object fp-infinity? drop f ; inline
+M: object fp-nan-payload drop f ; inline
: <fp-nan> ( payload -- nan )
HEX: 7ff0000000000000 bitor bits>double ; inline
-: next-float ( m -- n )
- double>bits
- dup -0.0 double>bits > [ 1 - bits>double ] [ ! negative non-zero
- dup -0.0 double>bits = [ drop 0.0 ] [ ! negative zero
- 1 + bits>double ! positive
- ] if
- ] if ; inline
-
-: prev-float ( m -- n )
- double>bits
- dup -0.0 double>bits >= [ 1 + bits>double ] [ ! negative
- dup 0.0 double>bits = [ drop -0.0 ] [ ! positive zero
- 1 - bits>double ! positive non-zero
- ] if
- ] if ; inline
+GENERIC: next-float ( m -- n )
+GENERIC: prev-float ( m -- n )
: next-power-of-2 ( m -- n )
dup 2 <= [ drop 2 ] [ 1 - log2 1 + 2^ ] if ; inline