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This commit is contained in:
Gwilym Inzani 2023-06-27 21:33:56 +01:00
parent 306be59cde
commit e1d03929f9
1 changed files with 4 additions and 4 deletions
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8
agb/src/sound/mixer/mixer.s
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@ -18,9 +18,9 @@ agb_arm_func agb_rs__mixer_add
ldr r7, [sp, #20] @ load the right channel modification amount into r7 ldr r7, [sp, #20] @ load the right channel modification amount into r7
cmp r7, r3 @ check if left and right channel need the same modifications cmp r7, r3 @ check if left and right channel need the same modifications
beq same_modification beq .Lsame_modification
modifications_fallback: .Lmodifications_fallback:
orr r7, r7, r3, lsl #16 @ r7 now is the left channel followed by the right channel modifications. orr r7, r7, r3, lsl #16 @ r7 now is the left channel followed by the right channel modifications.
mov r5, #0 @ current index we're reading from mov r5, #0 @ current index we're reading from
@ -47,13 +47,13 @@ modifications_fallback:
pop {{r4-r8}} pop {{r4-r8}}
bx lr bx lr
same_modification: .Lsame_modification:
@ check to see if this is a perfect power of 2 @ check to see if this is a perfect power of 2
@ r5 is a scratch register, r7 = r3 = amount to modify @ r5 is a scratch register, r7 = r3 = amount to modify
sub r5, r7, #1 sub r5, r7, #1
ands r5, r5, r7 ands r5, r5, r7
bne modifications_fallback @ not 0 means we need to do the full modification bne .Lmodifications_fallback @ not 0 means we need to do the full modification
@ count leading zeros of r7 into r3 @ count leading zeros of r7 into r3
mov r3, #0 mov r3, #0