1 ! Copyright (C) 2004, 2010 Slava Pestov.
2 ! Copyright (C) 2008, Doug Coleman.
3 ! See http://factorcode.org/license.txt for BSD license.
4 USING: kernel kernel.private sequences sequences.private math
5 math.private math.order combinators ;
6 IN: math.integers.private
8 : fixnum-min ( x y -- z ) [ fixnum< ] most ; foldable
9 : fixnum-max ( x y -- z ) [ fixnum> ] most ; foldable
11 M: integer numerator ; inline
12 M: integer denominator drop 1 ; inline
14 M: fixnum >fixnum ; inline
15 M: fixnum >bignum fixnum>bignum ; inline
16 M: fixnum >integer ; inline
18 M: fixnum hashcode* nip ; inline
19 M: fixnum equal? over bignum? [ >bignum bignum= ] [ 2drop f ] if ; inline
20 M: fixnum number= eq? ; inline
22 M: fixnum < fixnum< ; inline
23 M: fixnum <= fixnum<= ; inline
24 M: fixnum > fixnum> ; inline
25 M: fixnum >= fixnum>= ; inline
27 M: fixnum u< fixnum< ; inline
28 M: fixnum u<= fixnum<= ; inline
29 M: fixnum u> fixnum> ; inline
30 M: fixnum u>= fixnum>= ; inline
32 M: fixnum min over fixnum? [ fixnum-min ] [ call-next-method ] if ; inline
33 M: fixnum max over fixnum? [ fixnum-max ] [ call-next-method ] if ; inline
35 M: fixnum + fixnum+ ; inline
36 M: fixnum - fixnum- ; inline
37 M: fixnum * fixnum* ; inline
38 M: fixnum /i fixnum/i ; inline
41 CONSTANT: bignum/f-threshold HEX: 20,0000,0000,0000
43 : fixnum/f ( m n -- m/n )
44 [ >float ] bi@ float/f ; inline
47 2dup [ abs bignum/f-threshold >= ] either?
48 [ bignum/f ] [ fixnum/f ] if ; inline
50 M: fixnum mod fixnum-mod ; inline
52 M: fixnum /mod fixnum/mod ; inline
54 M: fixnum bitand fixnum-bitand ; inline
55 M: fixnum bitor fixnum-bitor ; inline
56 M: fixnum bitxor fixnum-bitxor ; inline
57 M: fixnum shift >fixnum fixnum-shift ; inline
59 M: fixnum bitnot fixnum-bitnot ; inline
61 : fixnum-bit? ( n m -- b )
62 neg shift 1 bitand 0 > ;
64 M: fixnum bit? fixnum-bit? ; inline
66 : fixnum-log2 ( x -- n )
67 0 swap [ dup 1 eq? ] [ [ 1 + ] [ 2/ ] bi* ] until drop ;
69 M: fixnum (log2) fixnum-log2 ; inline
71 M: bignum >fixnum bignum>fixnum ; inline
72 M: bignum >bignum ; inline
74 M: bignum hashcode* nip >fixnum ;
77 over bignum? [ bignum= ] [
78 swap dup fixnum? [ >bignum bignum= ] [ 2drop f ] if
81 M: bignum number= bignum= ; inline
83 M: bignum < bignum< ; inline
84 M: bignum <= bignum<= ; inline
85 M: bignum > bignum> ; inline
86 M: bignum >= bignum>= ; inline
88 M: bignum u< bignum< ; inline
89 M: bignum u<= bignum<= ; inline
90 M: bignum u> bignum> ; inline
91 M: bignum u>= bignum>= ; inline
93 M: bignum + bignum+ ; inline
94 M: bignum - bignum- ; inline
95 M: bignum * bignum* ; inline
96 M: bignum /i bignum/i ; inline
97 M: bignum mod bignum-mod ; inline
99 M: bignum /mod bignum/mod ; inline
101 M: bignum bitand bignum-bitand ; inline
102 M: bignum bitor bignum-bitor ; inline
103 M: bignum bitxor bignum-bitxor ; inline
104 M: bignum shift >fixnum bignum-shift ; inline
106 M: bignum bitnot bignum-bitnot ; inline
107 M: bignum bit? bignum-bit? ; inline
108 M: bignum (log2) bignum-log2 ; inline
110 ! Converting ratios to floats. Based on FLOAT-RATIO from
111 ! sbcl/src/code/float.lisp, which has the following license:
113 ! "The software is in the public domain and is
114 ! provided with absolutely no warranty."
116 ! First step: pre-scaling
117 : twos ( x -- y ) dup 1 - bitxor log2 ; inline
119 : scale-denonimator ( den -- scaled-den scale' )
120 dup twos neg [ shift ] keep ; inline
122 : pre-scale ( num den -- scale shifted-num scaled-den )
124 [ neg 54 + shift ] [ [ scale-denonimator ] dip + ] bi-curry bi*
128 : shift-mantissa ( scale mantissa -- scale' mantissa' )
129 [ 1 + ] [ 2/ ] bi* ; inline
131 : /f-loop ( scale mantissa den -- scale' fraction-and-guard rem )
132 [ 2dup /i log2 53 > ]
133 [ [ shift-mantissa ] dip ]
136 ! Third step: post-scaling
137 : unscaled-float ( mantissa -- n )
138 52 2^ 1 - bitand 1022 52 shift bitor bits>double ; inline
140 : scale-float ( scale mantissa -- float' )
141 [ dup 0 < [ neg 2^ recip ] [ 2^ ] if ] dip * ; inline
143 : post-scale ( scale mantissa -- n )
144 2/ dup log2 52 > [ shift-mantissa ] when
145 unscaled-float scale-float ; inline
148 : /f-abs ( m n -- f )
157 [ zero? [ 1 + ] unless ] [ drop ] if
162 : bignum/f ( m n -- f )
163 [ [ abs ] bi@ /f-abs ] [ [ 0 < ] bi@ xor ] 2bi [ neg ] when ;
165 M: bignum /f ( m n -- f )