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Added bitwise-bit-field.

This commit is contained in:
Abdulaziz Ghuloum 2008-01-20 23:13:24 -05:00
parent eedbe65e44
commit 9edb15a0f9
4 changed files with 29 additions and 5 deletions
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28
scheme/ikarus.numerics.ss
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@ -398,7 +398,7 @@
bitwise-arithmetic-shift-right bitwise-arithmetic-shift-left
bitwise-arithmetic-shift
bitwise-length
bitwise-copy-bit
bitwise-copy-bit bitwise-bit-field
positive? negative? expt gcd lcm numerator denominator
exact-integer-sqrt
quotient+remainder number->string string->number min max
@ -421,7 +421,7 @@
bitwise-arithmetic-shift-right bitwise-arithmetic-shift-left
bitwise-arithmetic-shift
bitwise-length
bitwise-copy-bit
bitwise-copy-bit bitwise-bit-field
positive? negative? bitwise-and bitwise-not
string->number expt gcd lcm numerator denominator
exact->inexact inexact floor ceiling round log
@ -2470,6 +2470,30 @@
(die who "negative bit index" idx))]
[else (die who "index is not an exact integer" idx)]))
(define (bitwise-bit-field n idx1 idx2)
(define who 'bitwise-bit-field)
(cond
[(and (fixnum? idx1) (fx>= idx1 0))
(cond
[(and (fixnum? idx2) (fx>= idx2 0))
(cond
[(fx<= idx1 idx2)
(cond
[(or (fixnum? n) (bignum? n))
(bitwise-and
(sra n idx1)
(- (sll 1 (- idx2 idx1)) 1))]
[else (die who "not an exact integer" n)])]
[else (die who "invalid order for indices" idx1 idx2)])]
[else
(if (not (fixnum? idx2))
(die who "invalid index" idx2)
(die who "negative index" idx2))])]
[else
(if (not (fixnum? idx1))
(die who "invalid index" idx1)
(die who "negative index" idx1))]))
)
(library (ikarus complexnums)

2
scheme/last-revision
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@ -1 +1 @@
1355
1356

2
scheme/makefile.ss
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@ -762,7 +762,7 @@
[bitwise-ior r bw]
[bitwise-xor r bw]
[bitwise-bit-count i r bw]
[bitwise-bit-field r bw]
[bitwise-bit-field i r bw]
[bitwise-bit-set? i r bw]
[bitwise-copy-bit i r bw]
[bitwise-copy-bit-field r bw]

2
scheme/todo-r6rs.ss
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@ -259,7 +259,7 @@
[bitwise-ior S bw]
[bitwise-xor S bw]
[bitwise-bit-count C bw]
[bitwise-bit-field S bw]
[bitwise-bit-field C bw]
[bitwise-bit-set? C bw]
[bitwise-copy-bit C bw]
[bitwise-copy-bit-field S bw]