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faster way of counting bits set. 12 => 11VBLs

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Daniel Borges
2018-12-31 14:21:49 +01:00
parent 9478fd7e24
commit 69bba61dcf
1 changed files with 2 additions and 3 deletions
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5
Code/main.asm
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@@ -40,8 +40,7 @@ AddLiveNeighbors: MACRO
and a, b and a, b
; count bits set ; count bits set
ld de, BitsSet ld d, HIGH(BitsSet)
add a, e
ld e, a ld e, a
ld a, [de] ld a, [de]
@@ -643,7 +642,7 @@ TilesLeft: ds 1 ; number of tiles left to render in current line
Video: ds 2 ; progressing pointer in tilemap (VRAM) Video: ds 2 ; progressing pointer in tilemap (VRAM)
Rendered: ds 2 ; progressing pointer in old buffer Rendered: ds 2 ; progressing pointer in old buffer
SECTION "Bits Set", ROM0, ALIGN[4] SECTION "Bits Set", ROM0, ALIGN[8]
BitsSet: BitsSet:
db 0; 0 = 0000 db 0; 0 = 0000
db 1; 1 = 0001 db 1; 1 = 0001