ikarus/scheme/tests/fixnums.ss

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(library (tests fixnums)
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(export test-fxdiv-and-mod test-fxdiv0-and-mod0
test-fxlength)
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(import (ikarus))
(define (test-fxdiv-and-mod)
(define (test x1 x2)
(let-values ([(d m) (fxdiv-and-mod x1 x2)])
(printf "(fxdiv-and-mod ~s ~s) = ~s ~s\n" x1 x2 d m)
(assert (= d (fxdiv x1 x2)))
(assert (= m (fxmod x1 x2)))
(assert (<= 0 m))
(assert (< m (abs x2)))
(assert (= x1 (+ (* d x2) m)))))
(test +17 +3)
(test +17 -3)
(test -17 +3)
(test -17 -3)
(test +16 +3)
(test +16 -3)
(test -16 +3)
(test -16 -3)
(test +15 +3)
(test +15 -3)
(test -15 +3)
(test -15 -3)
(test +10 +4)
(test +10 -4)
(test -10 +4)
(test -10 -4))
(define (test-fxdiv0-and-mod0)
(define (test x1 x2)
(let-values ([(d m) (fxdiv0-and-mod0 x1 x2)])
(printf "(fxdiv0-and-mod0 ~s ~s) = ~s ~s\n" x1 x2 d m)
(assert (= d (fxdiv0 x1 x2)))
(assert (= m (fxmod0 x1 x2)))
(assert (<= (- (abs (/ x2 2))) m))
(assert (< m (abs (/ x2 2))))
(assert (= x1 (+ (* d x2) m)))))
(test +17 +3)
(test +17 -3)
(test -17 +3)
(test -17 -3)
(test +16 +3)
(test +16 -3)
(test -16 +3)
(test -16 -3)
(test +15 +3)
(test +15 -3)
(test -15 +3)
(test -15 -3)
(test +10 +4)
(test +10 -4)
(test -10 +4)
(test -10 -4)
(test (least-fixnum) +1)
;(test (least-fixnum) -1) ;; overflows
(test (greatest-fixnum) +1)
(test (greatest-fixnum) -1)
(test (least-fixnum) +2)
(test (least-fixnum) -2)
(test (greatest-fixnum) +2)
(test (greatest-fixnum) -2)
(test 0 (least-fixnum))
(test 0 (greatest-fixnum))
(test +1 (least-fixnum))
(test +1 (greatest-fixnum))
(test -1 (least-fixnum))
(test -1 (greatest-fixnum))
(test +2 (least-fixnum))
(test +2 (greatest-fixnum))
(test -2 (least-fixnum))
(test -2 (greatest-fixnum))
(test (least-fixnum) (least-fixnum))
(test (greatest-fixnum) (least-fixnum))
(test (least-fixnum) (greatest-fixnum))
(test (greatest-fixnum) (greatest-fixnum)))
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(define (test-fxlength)
(define (test x)
(define (bitlen x)
(if (zero? x)
0
(+ 1 (bitlen (bitwise-arithmetic-shift-right x 1)))))
(define (len x)
(if (< x 0)
(bitlen (bitwise-not x))
(bitlen x)))
(let ([c0 (len x)]
[c1 (fxlength x)])
(unless (= c0 c1)
(error 'test-fxlength "failed/expected/got" x c0 c1))))
(define (fxtest x)
(when (fixnum? x)
(when (zero? (bitwise-and x #xFFFFFFF))
(printf "fxlength ~s\n" x))
(test x)
(fxtest (+ x #x100))))
(test 0)
(test 1)
(test 2)
(test 3)
(test -1)
(test -2)
(test -3)
(fxtest (least-fixnum)))
)
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