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optimization to save the X mod value -- it's the same for every row

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Rob McMullen 2017-06-30 12:33:27 -07:00
parent b3a4a5b5b4
commit 6dfab0efb5
1 changed files with 10 additions and 4 deletions
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14
HiSprite.py
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@ -410,10 +410,16 @@ class Sprite(Listing):
self.asm("sta SCRATCH1")
self.asm("lda HGRROWS_L,x")
self.asm("sta SCRATCH0")
self.asm("ldy PARAM0")
self.asm("lda DIV%d_%d,y" % (self.screen.numShifts, self.screen.bitsPerPixel))
self.asm("tay")
return cycles + 4 + 3 + 4 + 3 + 3 + 4 + 2;
if row == 0:
self.asm("ldy PARAM0")
self.asm("lda DIV%d_%d,y" % (self.screen.numShifts, self.screen.bitsPerPixel))
self.asm("sta PARAM2") # save the mod lookup; it doesn't change
self.asm("tay")
cycles += 3 + 4 + 3 + 2
else:
self.asm("ldy PARAM2")
cycles += 2
return cycles + 4 + 3 + 4 + 3;
def shiftStringRight(string, shift, bitsPerPixel, fillerBit):