[gforth] / gforth / sieve.fs  

gforth: gforth/sieve.fs

File: [gforth] / gforth / sieve.fs (download)
Revision: 1.2, Wed Aug 31 19:42:52 1994 UTC (18 years, 8 months ago) by pazsan
Branch: MAIN
Changes since 1.1: +8 -8 lines 
Added options to allow good register scheduling on i386
added blocks

#! /usr/stud/paysan/bin/forth

DECIMAL
: SECS TIME&DATE  SWAP 60 * + SWAP 3600 * +  NIP NIP NIP ;
CREATE FLAGS 8190 ALLOT
FLAGS 8190 + CONSTANT EFLAG

: PRIMES  ( -- n )  FLAGS 8190 1 FILL  0 3  EFLAG FLAGS
  DO   I C@
       IF  DUP I + DUP EFLAG <
           IF    EFLAG SWAP
                 DO  0 I C! DUP  +LOOP
           ELSE  DROP  THEN  SWAP 1+ SWAP
           THEN  2 +
       LOOP  DROP ;

: BENCHMARK  0 100 0 DO  PRIMES NIP  LOOP ;
SECS BENCHMARK . SECS SWAP - CR . .( secs)

\ HPPA/720, 50 MHz: user 3.90s
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