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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/alpha/lib/memmove.S
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/*

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 * arch/alpha/lib/memmove.S

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 *

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 * Barely optimized memmove routine for Alpha EV5.

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 *

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 * This is hand-massaged output from the original memcpy.c.  We defer to

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 * memcpy whenever possible; the backwards copy loops are not unrolled.

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 */

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	.set noat

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	.set noreorder

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	.text

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	.align 4

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	.globl memmove

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	.ent memmove

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memmove:

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	ldgp $29, 0($27)

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	unop

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	nop

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	.prologue 1

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	addq $16,$18,$4

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	addq $17,$18,$5

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	cmpule $4,$17,$1		/*  dest + n <= src  */

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	cmpule $5,$16,$2		/*  dest >= src + n  */

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	bis $1,$2,$1

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	mov $16,$0

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	xor $16,$17,$2

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	bne $1,memcpy			!samegp

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	and $2,7,$2			/* Test for src/dest co-alignment.  */

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	and $16,7,$1

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	cmpule $16,$17,$3

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	bne $3,$memmove_up		/* dest < src */

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	and $4,7,$1

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	bne $2,$misaligned_dn

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	unop

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	beq $1,$skip_aligned_byte_loop_head_dn

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$aligned_byte_loop_head_dn:

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	lda $4,-1($4)

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	lda $5,-1($5)

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	unop

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	ble $18,$egress

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	ldq_u $3,0($5)

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	ldq_u $2,0($4)

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	lda $18,-1($18)

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	extbl $3,$5,$1

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	insbl $1,$4,$1

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	mskbl $2,$4,$2

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	bis $1,$2,$1

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	and $4,7,$6

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	stq_u $1,0($4)

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	bne $6,$aligned_byte_loop_head_dn

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$skip_aligned_byte_loop_head_dn:

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	lda $18,-8($18)

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	blt $18,$skip_aligned_word_loop_dn

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$aligned_word_loop_dn:

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	ldq $1,-8($5)

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	nop

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	lda $5,-8($5)

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	lda $18,-8($18)

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	stq $1,-8($4)

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	nop

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	lda $4,-8($4)

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	bge $18,$aligned_word_loop_dn

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$skip_aligned_word_loop_dn:

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	lda $18,8($18)

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	bgt $18,$byte_loop_tail_dn

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	unop

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	ret $31,($26),1

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	.align 4

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$misaligned_dn:

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	nop

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	fnop

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	unop

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	beq $18,$egress

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$byte_loop_tail_dn:

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	ldq_u $3,-1($5)

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	ldq_u $2,-1($4)

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	lda $5,-1($5)

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	lda $4,-1($4)

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	lda $18,-1($18)

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	extbl $3,$5,$1

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	insbl $1,$4,$1

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	mskbl $2,$4,$2

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	bis $1,$2,$1

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	stq_u $1,0($4)

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	bgt $18,$byte_loop_tail_dn

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	br $egress

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$memmove_up:

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	mov $16,$4

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	mov $17,$5

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	bne $2,$misaligned_up

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	beq $1,$skip_aligned_byte_loop_head_up

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$aligned_byte_loop_head_up:

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	unop

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	ble $18,$egress

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	ldq_u $3,0($5)

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	ldq_u $2,0($4)

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	lda $18,-1($18)

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	extbl $3,$5,$1

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	insbl $1,$4,$1

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	mskbl $2,$4,$2

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	bis $1,$2,$1

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	lda $5,1($5)

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	stq_u $1,0($4)

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	lda $4,1($4)

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	and $4,7,$6

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	bne $6,$aligned_byte_loop_head_up

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$skip_aligned_byte_loop_head_up:

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	lda $18,-8($18)

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	blt $18,$skip_aligned_word_loop_up

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$aligned_word_loop_up:

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	ldq $1,0($5)

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	nop

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	lda $5,8($5)

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	lda $18,-8($18)

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	stq $1,0($4)

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	nop

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	lda $4,8($4)

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	bge $18,$aligned_word_loop_up

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$skip_aligned_word_loop_up:

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	lda $18,8($18)

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	bgt $18,$byte_loop_tail_up

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	unop

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	ret $31,($26),1

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	.align 4

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$misaligned_up:

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	nop

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	fnop

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	unop

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	beq $18,$egress

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$byte_loop_tail_up:

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	ldq_u $3,0($5)

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	ldq_u $2,0($4)

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	lda $18,-1($18)

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	extbl $3,$5,$1

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	insbl $1,$4,$1

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	mskbl $2,$4,$2

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	bis $1,$2,$1

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	stq_u $1,0($4)

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	lda $5,1($5)

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	lda $4,1($4)

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	nop

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	bgt $18,$byte_loop_tail_up

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$egress:

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	ret $31,($26),1

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	nop

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	nop

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	nop

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	.end memmove

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