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Very minor optimization

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It only effect happens at common misaligned memory check and fixup
Does the exact same end result, just in less 2 instructions and independent of r4 and r5, using r12 instead
This commit is contained in:
luigoalma 2019-04-04 00:47:36 +01:00 committed by d0k3
parent ce71e56a52
commit 6a95643edb
1 changed files with 3 additions and 5 deletions
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8
arm9/source/common/memcpy.s
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@ -26,17 +26,15 @@ memcpy:
orr r12, r0, r1 orr r12, r0, r1
ands r12, r12, #3 ands r12, r12, #3
beq .L1 beq .L1
and r4, r0, #3 mov r12, r0, LSL#30
and r5, r1, #3 cmp r12, r1, LSL#30
cmp r4, r5
bne .L6 bne .L6
rsb r4, r4, #4
.L0: .L0:
ldrb r3, [r1], #1 ldrb r3, [r1], #1
strb r3, [r0], #1 strb r3, [r0], #1
subs r2, r2, #1 subs r2, r2, #1
popeq {r0,r4-r9,pc} popeq {r0,r4-r9,pc}
subs r4, r4, #1 adds r12, r12, #0x40000000
bne .L0 bne .L0
.L1: .L1:
@ check if length higher than 32 @ check if length higher than 32