;;;; bitwise-utils-test  -*- Scheme -*-
;;;; Kon Lovett, Apr '20

(import test)

(test-begin "Bitwise Utils")

;;;

(import bitwise-utils)
(import (chicken bitwise))

(define (hex->number x) (string->number x 16))
(define (number->hex x) (number->string x 16))
(define (negate x) (* -1 x))

;(bitwise-join #t 23 '())

(test #b+01111111 (bitwise-mask 7))
(test #b+01111111 (bitwise-mask 7 #t))
(test #b-10000000 (bitwise-mask 7 #f))

(test #b-100 (logical-shift-right #b-1000 1))
(test #b+100 (logical-shift-right #b+1000 1))

(test #b-101 (logical-shift-right #b-1011 1))
(test #b+101 (logical-shift-right #b+1011 1))

(test #x-2c (logical-shift-right #x-b0 2))
(test #x+2c (logical-shift-right #x+b0 2))

(test #x-2c000000000000000000000000044000
  (logical-shift-right #x-b0000000000000000000000000110000 2))
(test #x+2c000000000000000000000000044000
  (logical-shift-right #x+b0000000000000000000000000110000 2))

(test #b+0111111100 (logical-shift-left (bitwise-mask 7) 2))
(test #b+0111111100 (logical-shift-left (bitwise-mask 7 #t) 2))
(test #b-1000000000 (logical-shift-left (bitwise-mask 7 #f) 2))

(test 1023 (string-length (number->string (bitwise-mask 1023) 2)))

(test #b101101 (bitwise-join #b10 #b0000001 #b101))
(test #b110011000000001 (bitwise-join #b1100 #b1100000000 #b1))
(test #xb0000000000000000000000000110000deadbeef
  (bitwise-join #xb0000000000000000000000000110000 #xdeadbeef))

;mask effectively #b1..11000000011 (#b-111111101)
(test #b-111111101 (bitwise-join (bitwise-mask 7 #f) #b11))
(test #b110011000000001 (bitwise-and #b110011010110101 (bitwise-join (bitwise-mask 7 #f) #b11)))
(test #b110011000000001 (bitwise-and #b110011010110101 #b111111000000011))

(test '(0) (bitwise-split 0 5))
(test '(5) (bitwise-split 5 0))
(test '(0) (bitwise-split 0 0))

(test '("a" "b" "c" "d" "e" "f") (map number->hex (bitwise-split #xabcdef 4)))
(test '("-a" "-b" "-c" "-d" "-e" "-f") (map number->hex (bitwise-split #x-abcdef 4)))

;NOTE not bitwise-join <inverse> bitwise-split due to sign
(test #xabcdef (apply bitwise-join (map hex->number '("a" "b" "c" "d" "e" "f"))))
(test #x-abcdef (negate (apply bitwise-join (map (o negate hex->number) '("-a" "-b" "-c" "-d" "-e" "-f")))))

(test '("b0000000" "0" "110000deadbeef") (map number->hex (bitwise-split #xb0000000000000000000000000110000deadbeef 64)))
(test '("-b0000000" "0" "-110000deadbeef") (map number->hex (bitwise-split #x-b0000000000000000000000000110000deadbeef 64)))

(test 29 (bitwise-count #xb0000000000000000000000000110000deadbeef))
(test 28 (bitwise-count #x-b0000000000000000000000000110000deadbeef))

;;;

(test-end "Bitwise Utils")

(test-exit)