20 lines
514 B
Scheme
20 lines
514 B
Scheme
; Copyright (c) 1994 by Richard Kelsey. See file COPYING.
|
|
|
|
|
|
(define (foo x y z)
|
|
(if (and (= (bitwise-and x 3) 0)
|
|
(= (bitwise-and y 3) 0)
|
|
(= (bitwise-and z 3) 0))
|
|
(ashl (ashr x 2) 2)
|
|
(ashl y (ashr z 2))))
|
|
|
|
(define-local-syntax (define-primitive id nargs)
|
|
(let ((args (reverse (list-tail '(z y x) (- '3 nargs)))))
|
|
`(define (,id . ,args)
|
|
(call-primitively ,id . ,args))))
|
|
|
|
(define-primitive = 2)
|
|
(define-primitive bitwise-and 2)
|
|
(define-primitive ashl 2)
|
|
(define-primitive ashr 2)
|