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copy in CountSetBits from pokered

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Bryan Bishop
2012-05-30 21:21:27 -05:00
parent ded5884f53
commit 5693487f9a
1 changed files with 29 additions and 1 deletions
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30
main.asm
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@@ -256,7 +256,35 @@ StringCmp: ; 31db
ret ret
; 0x31e4 ; 0x31e4
INCBIN "baserom.gbc",$31e4,$4000 - $31e4 INCBIN "baserom.gbc",$31e4,$335f - $31e4
CountSetBits: ; 0x335f
; function to count how many bits are set in a string of bytes
; INPUT:
; hl = address of string of bytes
; b = length of string of bytes
; OUTPUT:
; [$d265] = number of set bits
ld c, $0
.loop\@
ld a, [hli]
ld e, a
ld d, $8
.innerLoop\@ ; count how many bits are set in the current byte
srl e
ld a, $0
adc c
ld c, a
dec d
jr nz, .innerLoop\@
dec b
jr nz, .loop\@ ; 0x336f $f0
ld a, c
ld [$d265], a
ret
; 0x3376
INCBIN "baserom.gbc",$3376,$4000 - $3376
SECTION "bank1",DATA,BANK[$1] SECTION "bank1",DATA,BANK[$1]