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53 lines
1.3 KiB
Lua
53 lines
1.3 KiB
Lua
%import textio
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%import floats
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%zeropage basicsafe
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%option no_sysinit
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; The "Byte Sieve" test. https://en.wikipedia.org/wiki/Byte_Sieve
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; Note: this program is compatible with C64 and CX16.
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main {
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sub start() {
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c64.SETTIM(0, 0, 0)
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const ubyte ITERS = 10
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uword count
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uword i
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uword prime
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uword k
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const uword SIZEPL = 8191
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uword @zp flags_ptr = memory("flags", SIZEPL, $100)
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txt.print_ub(ITERS)
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txt.print(" iterations, calculating...\n")
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repeat ITERS {
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sys.memset(flags_ptr, SIZEPL, 1)
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count = 0
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for i in 0 to SIZEPL-1 {
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if @(flags_ptr+i) {
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prime = i + i + 3
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k = i + prime
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while k <= SIZEPL-1 {
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@(flags_ptr + k) = false
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k += prime
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}
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; txt.print_uw(prime)
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; txt.spc()
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count++
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}
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}
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}
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txt.print_uw(count)
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txt.print(" primes\n")
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float time = c64.RDTIM16() as float / 60.0
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floats.print_f(time)
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txt.print(" sec total = ")
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floats.print_f(time/ITERS)
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txt.print(" sec per iteration\n")
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}
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}
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