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#include "PR/asm.h"
#include "PR/regdef.h"
.text
LEAF(bcopy)
move a3, a1
beqz a2, ret
beq a0, a1, ret
blt a1, a0, goforwards
add v0, a0, a2
bge a1, v0, goforwards
b gobackwards
goforwards:
blt a2, 0x10, forwards_bytecopy
and v0, a0, 3
and v1, a1, 3
beq v0, v1, forwalignable
forwards_bytecopy:
beqz a2, ret
addu v1, a0, a2
99:
lb v0, (a0)
addu a0, a0, 1
sb v0, (a1)
addu a1, a1, 1
bne a0, v1, 99b
ret:
move v0, a3
jr ra
forwalignable:
beqz v0, forwards_32
beq v0, 1, forw_copy3
beq v0, 2, forw_copy2
lb v0, (a0)
addu a0, a0, 1
sb v0, (a1)
addu a1, a1, 1
addu a2, a2, -1
b forwards_32
forw_copy2:
lh v0, (a0)
addu a0, a0, 2
sh v0, (a1)
addu a1, a1, 2
addu a2, a2, -2
b forwards_32
forw_copy3:
lb v0, (a0)
lh v1, 1(a0)
addu a0, a0, 3
sb v0, (a1)
sh v1, 1(a1)
addu a1, a1, 3
addu a2, a2, -3
forwards:
forwards_32:
blt a2, 32, forwards_16
lw v0, 0(a0)
lw v1, 4(a0)
lw t0, 8(a0)
lw t1, 12(a0)
lw t2, 16(a0)
lw t3, 20(a0)
lw t4, 24(a0)
lw t5, 28(a0)
addu a0, a0, 32
sw v0, 0(a1)
sw v1, 4(a1)
sw t0, 8(a1)
sw t1, 12(a1)
sw t2, 16(a1)
sw t3, 20(a1)
sw t4, 24(a1)
sw t5, 28(a1)
addu a1, a1, 32
addu a2, a2, -32
b forwards_32
forwards_16:
blt a2, 16, forwards_4
lw v0, 0(a0)
lw v1, 4(a0)
lw t0, 8(a0)
lw t1, 12(a0)
addu a0, a0, 16
sw v0, 0(a1)
sw v1, 4(a1)
sw t0, 8(a1)
sw t1, 12(a1)
addu a1, a1, 16
addu a2, a2, -16
b forwards_16
forwards_4:
blt a2, 4, forwards_bytecopy
lw v0, 0(a0)
addu a0, a0, 4
sw v0, 0(a1)
addu a1, a1, 4
addu a2, a2, -4
b forwards_4
gobackwards:
add a0, a0,a2
add a1, a1,a2
blt a2, 16, backwards_bytecopy
and v0, a0, 0x3
and v1, a1, 0x3
beq v0, v1, backalignable
backwards_bytecopy:
beqz a2, ret
addu a0, a0, -1
addu a1, a1, -1
subu v1, a0,a2
99:
lb v0, 0(a0)
addu a0, a0, -1
sb v0, 0(a1)
addu a1, a1, -1
bne a0, v1,99b
move v0, a3
jr ra
backalignable:
beqz v0, backwards
beq v0, 3, back_copy3
beq v0, 2, back_copy2
lb v0, -1(a0)
addu a0, a0, -1
sb v0, -1(a1)
addu a1, a1, -1
addu a2, a2, -1
b backwards
back_copy2:
lh v0, -2(a0)
addu a0, a0, -2
sh v0, -2(a1)
addu a1, a1, -2
addu a2, a2, -2
b backwards
back_copy3:
lb v0, -1(a0)
lh v1, -3(a0)
addu a0, a0, -3
sb v0, -1(a1)
sh v1, -3(a1)
addu a1, a1, -3
addu a2, a2, -3
backwards:
backwards_32:
blt a2, 32, backwards_16
lw v0, -4(a0)
lw v1, -8(a0)
lw t0, -12(a0)
lw t1, -16(a0)
lw t2, -20(a0)
lw t3, -24(a0)
lw t4, -28(a0)
lw t5, -32(a0)
addu a0, a0, -32
sw v0, -4(a1)
sw v1, -8(a1)
sw t0, -12(a1)
sw t1, -16(a1)
sw t2, -20(a1)
sw t3, -24(a1)
sw t4, -28(a1)
sw t5, -32(a1)
addu a1, a1, -32
addu a2, a2, -32
b backwards_32
backwards_16:
blt a2, 16, backwards_4
lw v0, -4(a0)
lw v1, -8(a0)
lw t0, -12(a0)
lw t1, -16(a0)
addu a0, a0, -16
sw v0, -4(a1)
sw v1, -8(a1)
sw t0, -12(a1)
sw t1, -16(a1)
addu a1, a1, -16
addu a2, a2, -16
b backwards_16
backwards_4:
blt a2, 4, backwards_bytecopy
lw v0, -4(a0)
addu a0, a0, -4
sw v0, -4(a1)
addu a1, a1, -4
addu a2, a2, -4
b backwards_4
END(bcopy)
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