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Only load SWAP_SIGN once

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Gwilym Kuiper 2022-05-04 18:08:15 +01:00
parent 8ec839f181
commit 863abe1d42
1 changed files with 6 additions and 5 deletions
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11
agb/src/sound/mixer/mixer.s
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@ -155,16 +155,18 @@ agb_arm_func agb_rs__mixer_collapse
@ Arguments:
@ r0 = target buffer (i8)
@ r1 = input buffer (i16) of fixnums with 4 bits of precision (read in sets of i16 in an i32)
push {r4, r5, r6, r7, r8, r9, r10}
push {r4, r5, r6, r7, r8, r9, r10, r11}
CONST_0 .req r7
CONST_FF .req r8
CONST_127 .req r9
TEMP .req r10
SWAP_SIGN .req r11
ldr CONST_0, =0
ldr CONST_FF, =0xff
ldr CONST_127, =127
ldr SWAP_SIGN, =0x80808080
ldr r2, agb_rs__buffer_size @ loop counter
mov r4, r2
@ -201,9 +203,8 @@ TEMP .req r10
orr r3, r3, r5, lsl #24
orr r12, r12, r6, lsl #24
ldr r5, =0x80808080
eor r3, r3, r5
eor r12, r12, r5
eor r3, r3, SWAP_SIGN
eor r12, r12, SWAP_SIGN
str r3, [r0, r4] @ *(r0 + (r4 = SOUND_BUFFER_SIZE)) = r3
str r12, [r0], #4 @ *r0 = r12; r0 += 4
@ -211,6 +212,6 @@ TEMP .req r10
subs r2, r2, #4 @ r2 -= 4
bne 1b @ loop if not 0
pop {r4, r5, r6, r7, r8, r9, r10}
pop {r4, r5, r6, r7, r8, r9, r10, r11}
bx lr
agb_arm_end agb_rs__mixer_collapse