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Use r9 rather than lr

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This commit is contained in:
Gwilym Kuiper 2021-08-01 21:00:49 +01:00
parent 2db696f8bf
commit cce3ecdde5
1 changed files with 5 additions and 5 deletions
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10
agb/src/sound/mixer/mixer.s
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@ -12,11 +12,11 @@ agb_rs__mixer_add:
@ @
@ The sound buffer must be SOUND_BUFFER_SIZE * 2 in size = 176 * 2 @ The sound buffer must be SOUND_BUFFER_SIZE * 2 in size = 176 * 2
@ lr = amount to modify right channel by @ r9 = amount to modify right channel by
push {r4-r10, lr} push {r4-r10}
ldr lr, [sp, #32] @ load the right channel modification amount into lr ldr r9, [sp, #28] @ load the right channel modification amount into r9
mov r12, #0 @ current write offset into the resulting buffer mov r12, #0 @ current write offset into the resulting buffer
mov r8, #352 @ the offset for writing to the resulting buffer between left and right channels mov r8, #352 @ the offset for writing to the resulting buffer between left and right channels
@ -41,14 +41,14 @@ agb_rs__mixer_add:
strh r7, [r6], r8 @ *r6 = r7, r6 += r8 where r8 = 352 = offset for the right hand side strh r7, [r6], r8 @ *r6 = r7, r6 += r8 where r8 = 352 = offset for the right hand side
ldrh r7, [r6] @ same for the right hand side, r6 now points to the right hand side location ldrh r7, [r6] @ same for the right hand side, r6 now points to the right hand side location
mla r4, r10, lr, r7 mla r4, r10, r9, r7
strh r4, [r6] strh r4, [r6]
add r12, r12, #2 @ increment the current write offset in the resulting buffer add r12, r12, #2 @ increment the current write offset in the resulting buffer
cmp r12, #352 @ check if we're done cmp r12, #352 @ check if we're done
bne 1b bne 1b
pop {r4-r10, lr} pop {r4-r10}
bx lr bx lr
.pool .pool