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benchmark noise

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Remove an unnecessary manual unrolling
This commit is contained in:
Matthew Flatt 2012-12-05 13:54:09 -06:00
parent a6eb219305
commit ea79cc4417
1 changed files with 3 additions and 9 deletions
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12
collects/tests/racket/benchmarks/shootout/mandelbrot.rkt
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@ -25,19 +25,13 @@
(flvector-set! v x (fl- (fl/ (fx->fl (fx* 2 x)) N.0) 1.5)))
v))
(define-syntax (let-n stx)
(syntax-case stx ()
[(_ N bindings E)
(let loop ([N (syntax-e #'N)] [E #'E])
(if (zero? N) E (loop (sub1 N) #`(let bindings #,E))))]))
(define-syntax-rule (mandelbrot Cr Ci)
(let loop ([i 0] [Zr 0.0] [Zi 0.0])
(cond [(fl> (fl+ (fl* Zr Zr) (fl* Zi Zi)) LIMIT-SQR) 0]
[(fx= i ITERATIONS) 1]
[else (let-n 5 ([Zr (fl+ (fl- (fl* Zr Zr) (fl* Zi Zi)) Cr)]
[Zi (fl+ (fl* 2.0 (fl* Zr Zi)) Ci)])
(loop (fx+ i 5) Zr Zi))])))
[else (let ([Zr (fl+ (fl- (fl* Zr Zr) (fl* Zi Zi)) Cr)]
[Zi (fl+ (fl* 2.0 (fl* Zr Zi)) Ci)])
(loop (fx+ i 1) Zr Zi))])))
(fprintf O "P4\n~a ~a\n" N N)
(let loop-y ([y N])