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#include "PR/R4300.h"
#include "sys/asm.h"
#include "sys/regdef.h"
.text
WEAK(_bcopy, bcopy)
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, 16, forwards_bytecopy
andi v0, a0, 0x3
andi v1, a1, 0x3
beq v0, v1,forwalignable
forwards_bytecopy:
beqz a2, ret
addu v1, a0, a2
99:
lb v0, 0(a0)
addiu a0, a0, 1
sb v0, 0(a1)
addiu a1, a1, 1
bne a0, v1, 99b
ret:
move v0, a3
jr ra
forwalignable:
beqz v0, forwards
beq v0, 1, forw_copy3
beq v0, 2, forw_copy2
lb v0, 0(a0)
addiu a0, a0, 1
sb v0, 0(a1)
addiu a1, a1, 1
addiu a2, a2, -1
b forwards
forw_copy2:
lh v0, 0(a0)
addiu a0, a0, 2
sh v0, 0(a1)
addiu a1, a1, 2
addiu a2, a2, -2
b forwards
forw_copy3:
lb v0, 0(a0)
lh v1, 1(a0)
addiu a0, a0, 3
sb v0, 0(a1)
sh v1, 1(a1)
addiu a1, a1, 3
addiu 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 ta0, 24(a0)
lw ta1, 28(a0)
addiu 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 ta0, 24(a1)
sw ta1, 28(a1)
addiu a1, a1, 32
addiu 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)
addiu a0, a0, 16
sw v0, 0(a1)
sw v1, 4(a1)
sw t0, 8(a1)
sw t1, 12(a1)
addiu a1, a1, 16
addiu a2, a2, -16
b forwards_16
forwards_4:
blt a2, 4, forwards_bytecopy
lw v0, 0(a0)
addiu a0, a0, 4
sw v0, 0(a1)
addiu a1, a1, 4
addiu a2, a2, -4
b forwards_4
gobackwards:
add a0, a0,a2
add a1, a1,a2
blt a2, 16, backwards_bytecopy
andi v0, a0, 0x3
andi v1, a1, 0x3
beq v0, v1,backalignable
backwards_bytecopy:
beqz a2, ret
addiu a0, a0, -1
addiu a1, a1, -1
subu v1, a0,a2
99:
lb v0, 0(a0)
addiu a0, a0, -1
sb v0, 0(a1)
addiu 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)
addiu a0, a0, -1
sb v0, -1(a1)
addiu a1, a1, -1
addiu a2, a2, -1
b backwards
back_copy2:
lh v0, -2(a0)
addiu a0, a0, -2
sh v0, -2(a1)
addiu a1, a1, -2
addiu a2, a2, -2
b backwards
back_copy3:
lb v0, -1(a0)
lh v1, -3(a0)
addiu a0, a0, -3
sb v0, -1(a1)
sh v1, -3(a1)
addiu a1, a1, -3
addiu 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 ta0, -28(a0)
lw ta1, -32(a0)
addiu 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 ta0, -28(a1)
sw ta1, -32(a1)
addiu a1, a1, -32
addiu 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)
addiu a0, a0, -16
sw v0, -4(a1)
sw v1, -8(a1)
sw t0, -12(a1)
sw t1, -16(a1)
addiu a1, a1, -16
addiu a2, a2, -16
b backwards_16
backwards_4:
blt a2, 4, backwards_bytecopy
lw v0, -4(a0)
addiu a0, a0, -4
sw v0, -4(a1)
addiu a1, a1, -4
addiu a2, a2, -4
b backwards_4
END(bcopy)
/*
*/
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