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art&graf.ix
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art-0015
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flicker
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fastrand.asm
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Assembly Source File
|
1997-04-16
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317b
|
15 lines
public _FastRand
_FastRand:
move.w randseed,d0
add.w d0,d0 ; shift seed left (add dn,dn is faster)
bhi.s L5 ; carry? (using bhi instead of bcc unlocks 0s)
eor.w #$2B41,d0 ; magic number for 16 bit seed
L5:
move.w d0,randseed
and.w #$3ff,d0 ; mask down to 0 to 1023
rts
dseg
randseed dc.w 0