37 lines
844 B
Factor
37 lines
844 B
Factor
USING: math math.parser sequences sequences.private kernel
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arrays make io ;
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IN: benchmark.nsieve
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: clear-flags ( step i seq -- )
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2dup length >= [
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3drop
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] [
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f 2over set-nth-unsafe [ over + ] dip clear-flags
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] if ; inline recursive
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: (nsieve) ( count i seq -- count )
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2dup length < [
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2dup nth-unsafe [
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over dup 2 * pick clear-flags
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[ 1 + ] 2dip ! increment count
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] when [ 1 + ] dip (nsieve)
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] [
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2drop
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] if ; inline recursive
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: nsieve ( m -- count )
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[ 0 2 ] dip 1 + t <array> (nsieve) ;
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: nsieve. ( m -- )
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[ "Primes up to " % dup # " " % nsieve # ] "" make print ;
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: nsieve-main ( n -- )
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[ 2^ 10000 * nsieve. ]
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[ 1 - 2^ 10000 * nsieve. ]
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[ 2 - 2^ 10000 * nsieve. ]
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tri ;
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: nsieve-main* ( -- ) 9 nsieve-main ;
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MAIN: nsieve-main*
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