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(integer-length): Exercise some negatives, in

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particular -2^n which is ...11100..00.
This commit is contained in:
Kevin Ryde 2003-05-10 00:10:40 +00:00
parent 2cfcaed525
commit a04a3604c2
1 changed files with 27 additions and 0 deletions
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27
test-suite/tests/numbers.test
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@ -1796,6 +1796,33 @@
;;; inexact->exact
;;;
;;;
;;; integer-length
;;;
(with-test-prefix "integer-length"
(with-test-prefix "-2^i, ...11100..00"
(do ((n -1 (ash n 1))
(i 0 (1+ i)))
((> i 256))
(pass-if (list n "expect" i)
(= i (integer-length n)))))
(with-test-prefix "-2^i+1 ...11100..01"
(do ((n -3 (logxor 3 (ash n 1)))
(i 2 (1+ i)))
((> i 256))
(pass-if n
(= i (integer-length n)))))
(with-test-prefix "-2^i-1 ...111011..11"
(do ((n -2 (1+ (ash n 1)))
(i 1 (1+ i)))
((> i 256))
(pass-if n
(= i (integer-length n))))))
;;;
;;; logcount
;;;