Subversion Repositories HelenOS-historic

.global memcpy

memcpy:

	addiu	$v0,$a1,3

	li	$v1,-4			# 0xfffffffffffffffc

	and	$v0,$v0,$v1

	beq	$a1,$v0,3f

	move	$t0,$a0

0:

	beq	$a2,$zero,2f

	move	$a3,$zero

1:

	addu	$v0,$a1,$a3

	lbu	$a0,0($v0)

	addu	$v1,$t0,$a3

	addiu	$a3,$a3,1

	bne	$a3,$a2,1b

	sb	$a0,0($v1)

2:

	jr	$ra

	move	$v0,$a1

3:

	addiu	$v0,$a0,3

	and	$v0,$v0,$v1

	bne	$a0,$v0,0b

	srl	$t1,$a2,2

	beq	$t1,$zero,5f

	move	$a3,$zero

	move	$a3,$zero

	move	$a0,$zero

4:

	addu	$v0,$a1,$a0

	lw	$v1,0($v0)

	addiu	$a3,$a3,1

	addu	$v0,$t0,$a0

	sw	$v1,0($v0)

	bne	$a3,$t1,4b

	addiu	$a0,$a0,4

5:

	andi	$a2,$a2,0x3

	beq	$a2,$zero,2b

	nop

	sll	$v0,$a3,2

	addu	$t1,$v0,$t0

	move	$a3,$zero

	addu	$t0,$v0,$a1

6:

	addu	$v0,$t0,$a3

	lbu	$a0,0($v0)

	addu	$v1,$t1,$a3

	addiu	$a3,$a3,1

	bne	$a3,$a2,6b

	sb	$a0,0($v1)

	jr	$ra

	move	$v0,$a1