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|
.set noat # allow manual use of $at
.set noreorder # don't insert nops after branches
.set gp=64
.include "macros.inc"
.section .text, "ax"
glabel bcopy
beqz $a2, ret
move $a3, $a1
beq $a0, $a1, ret
slt $at, $a1, $a0
bnezl $at, goforwards
slti $at, $a2, 0x10
add $v0, $a0, $a2
slt $at, $a1, $v0
beql $at, $zero, goforwards
slti $at, $a2, 0x10
b gobackwards
slti $at, $a2, 0x10
slti $at, $a2, 0x10
goforwards:
bnez $at, forwards_bytecopy
nop
andi $v0, $a0, 3
andi $v1, $a1, 3
beq $v0, $v1, forwalignable
nop
forwards_bytecopy:
beqz $a2, ret
nop
addu $v1, $a0, $a2
.L80323A38:
lb $v0, ($a0)
addiu $a0, $a0, 1
addiu $a1, $a1, 1
bne $a0, $v1, .L80323A38
sb $v0, -1($a1)
ret:
jr $ra
move $v0, $a3
forwalignable:
beqz $v0, forwards
li $at, 1
beq $v0, $at, forw_copy3
li $at, 2
beql $v0, $at, forw_copy2
lh $v0, ($a0)
lb $v0, ($a0)
addiu $a0, $a0, 1
addiu $a1, $a1, 1
addiu $a2, $a2, -1
b forwards
sb $v0, -1($a1)
lh $v0, ($a0)
forw_copy2:
addiu $a0, $a0, 2
addiu $a1, $a1, 2
addiu $a2, $a2, -2
b forwards
sh $v0, -2($a1)
forw_copy3:
lb $v0, ($a0)
lh $v1, 1($a0)
addiu $a0, $a0, 3
addiu $a1, $a1, 3
addiu $a2, $a2, -3
sb $v0, -3($a1)
sh $v1, -2($a1)
forwards:
slti $at, $a2, 0x20
bnezl $at, forwards_16
slti $at, $a2, 0x10
lw $v0, ($a0)
lw $v1, 4($a0)
lw $t0, 8($a0)
lw $t1, 0xc($a0)
lw $t2, 0x10($a0)
lw $t3, 0x14($a0)
lw $t4, 0x18($a0)
lw $t5, 0x1c($a0)
addiu $a0, $a0, 0x20
addiu $a1, $a1, 0x20
addiu $a2, $a2, -0x20
sw $v0, -0x20($a1)
sw $v1, -0x1c($a1)
sw $t0, -0x18($a1)
sw $t1, -0x14($a1)
sw $t2, -0x10($a1)
sw $t3, -0xc($a1)
sw $t4, -8($a1)
b forwards
sw $t5, -4($a1)
.L80323B14:
slti $at, $a2, 0x10
forwards_16:
bnezl $at, .L80323B54
slti $at, $a2, 4
lw $v0, ($a0)
lw $v1, 4($a0)
lw $t0, 8($a0)
lw $t1, 0xc($a0)
addiu $a0, $a0, 0x10
addiu $a1, $a1, 0x10
addiu $a2, $a2, -0x10
sw $v0, -0x10($a1)
sw $v1, -0xc($a1)
sw $t0, -8($a1)
b .L80323B14
sw $t1, -4($a1)
forwards_4:
slti $at, $a2, 4
.L80323B54:
bnez $at, forwards_bytecopy
nop
lw $v0, ($a0)
addiu $a0, $a0, 4
addiu $a1, $a1, 4
addiu $a2, $a2, -4
b forwards_4
sw $v0, -4($a1)
slti $at, $a2, 0x10
gobackwards:
add $a0, $a0, $a2
bnez $at, .L80323B94
add $a1, $a1, $a2
andi $v0, $a0, 3
andi $v1, $a1, 3
beq $v0, $v1, .L80323BC4
nop
.L80323B94:
beqz $a2, ret
nop
addiu $a0, $a0, -1
addiu $a1, $a1, -1
subu $v1, $a0, $a2
.L80323BA8:
lb $v0, ($a0)
addiu $a0, $a0, -1
addiu $a1, $a1, -1
bne $a0, $v1, .L80323BA8
sb $v0, 1($a1)
jr $ra
move $v0, $a3
.L80323BC4:
beqz $v0, backwards_32
li $at, 3
beq $v0, $at, .L80323C0C
li $at, 2
beql $v0, $at, .L80323BF8
lh $v0, -2($a0)
lb $v0, -1($a0)
addiu $a0, $a0, -1
addiu $a1, $a1, -1
addiu $a2, $a2, -1
b backwards_32
sb $v0, ($a1)
lh $v0, -2($a0)
.L80323BF8:
addiu $a0, $a0, -2
addiu $a1, $a1, -2
addiu $a2, $a2, -2
b backwards_32
sh $v0, ($a1)
.L80323C0C:
lb $v0, -1($a0)
lh $v1, -3($a0)
addiu $a0, $a0, -3
addiu $a1, $a1, -3
addiu $a2, $a2, -3
sb $v0, 2($a1)
sh $v1, ($a1)
backwards_32:
slti $at, $a2, 0x20
bnezl $at, .L80323C88
slti $at, $a2, 0x10
lw $v0, -4($a0)
lw $v1, -8($a0)
lw $t0, -0xc($a0)
lw $t1, -0x10($a0)
lw $t2, -0x14($a0)
lw $t3, -0x18($a0)
lw $t4, -0x1c($a0)
lw $t5, -0x20($a0)
addiu $a0, $a0, -0x20
addiu $a1, $a1, -0x20
addiu $a2, $a2, -0x20
sw $v0, 0x1c($a1)
sw $v1, 0x18($a1)
sw $t0, 0x14($a1)
sw $t1, 0x10($a1)
sw $t2, 0xc($a1)
sw $t3, 8($a1)
sw $t4, 4($a1)
b backwards_32
sw $t5, ($a1)
backwards_16:
slti $at, $a2, 0x10
.L80323C88:
bnezl $at, .L80323CC4
slti $at, $a2, 4
lw $v0, -4($a0)
lw $v1, -8($a0)
lw $t0, -0xc($a0)
lw $t1, -0x10($a0)
addiu $a0, $a0, -0x10
addiu $a1, $a1, -0x10
addiu $a2, $a2, -0x10
sw $v0, 0xc($a1)
sw $v1, 8($a1)
sw $t0, 4($a1)
b backwards_16
sw $t1, ($a1)
backwards_4:
slti $at, $a2, 4
.L80323CC4:
bnez $at, .L80323B94
nop
lw $v0, -4($a0)
addiu $a0, $a0, -4
addiu $a1, $a1, -4
addiu $a2, $a2, -4
b backwards_4
sw $v0, ($a1)
nop
nop
nop
|
