71 lines
2.3 KiB
Scheme
71 lines
2.3 KiB
Scheme
;;; DESTRUC -- Destructive operation benchmark.
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(library (rnrs-benchmarks destruc)
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(export main)
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(import (rnrs)
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(rnrs mutable-pairs)
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(rnrs r5rs)
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(rnrs-benchmarks))
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(define (append-to-tail! x y)
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(if (null? x)
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y
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(let loop ((a x) (b (cdr x)))
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(if (null? b)
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(begin
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(set-cdr! a y)
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x)
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(loop b (cdr b))))))
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(define (destructive n m)
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(let ((l (do ((i 10 (- i 1)) (a '() (cons '() a)))
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((= i 0) a))))
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(do ((i n (- i 1)))
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((= i 0) l)
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(cond ((null? (car l))
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(do ((l l (cdr l)))
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((null? l))
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(if (null? (car l)) (set-car! l (cons '() '())))
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(append-to-tail! (car l)
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(do ((j m (- j 1)) (a '() (cons '() a)))
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((= j 0) a)))))
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(else
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(do ((l1 l (cdr l1)) (l2 (cdr l) (cdr l2)))
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((null? l2))
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(set-cdr! (do ((j (quotient (length (car l2)) 2) (- j 1))
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(a (car l2) (cdr a)))
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((zero? j) a)
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(set-car! a i))
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(let ((n (quotient (length (car l1)) 2)))
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(cond ((= n 0)
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(set-car! l1 '())
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(car l1))
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(else
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(do ((j n (- j 1)) (a (car l1) (cdr a)))
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((= j 1)
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(let ((x (cdr a)))
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(set-cdr! a '())
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x))
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(set-car! a i))))))))))))
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(define (main . args)
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(run-benchmark
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"destruc"
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destruc-iters
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(lambda (result)
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(equal? result
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'((1 1 2)
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(1 1 1)
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(1 1 1 2)
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(1 1 1 1)
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(1 1 1 1 2)
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(1 1 1 1 2)
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(1 1 1 1 2)
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(1 1 1 1 2)
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(1 1 1 1 2)
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(1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 3))))
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(lambda (n m) (lambda () (destructive n m)))
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600
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50)))
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