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44 lines
959 B
Lua
44 lines
959 B
Lua
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; The "Byte Sieve" test. https://en.wikipedia.org/wiki/Byte_Sieve
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%import textio
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%zeropage basicsafe
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%option no_sysinit
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main {
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sub start() {
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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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^^bool @zp flags_ptr = memory("flags", SIZEPL, $100)
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txt.print("calculating...\n")
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sys.memset(flags_ptr, SIZEPL, 1)
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count = 1
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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.nl()
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count++
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}
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}
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txt.nl()
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txt.print("last prime: ")
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txt.print_uw(prime)
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txt.print("\nnumber of primes: ")
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txt.print_uw(count)
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txt.nl()
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}
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}
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