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| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * arch/alpha/lib/memmove.S
| *
| * Barely optimized memmove routine for Alpha EV5.
| *
| * This is hand-massaged output from the original memcpy.c. We defer to
| * memcpy whenever possible; the backwards copy loops are not unrolled.
| */
| #include <asm/export.h>
| .set noat
| .set noreorder
| .text
|
| .align 4
| .globl memmove
| .ent memmove
| memmove:
| ldgp $29, 0($27)
| unop
| nop
| .prologue 1
|
| addq $16,$18,$4
| addq $17,$18,$5
| cmpule $4,$17,$1 /* dest + n <= src */
| cmpule $5,$16,$2 /* dest >= src + n */
|
| bis $1,$2,$1
| mov $16,$0
| xor $16,$17,$2
| bne $1,memcpy !samegp
|
| and $2,7,$2 /* Test for src/dest co-alignment. */
| and $16,7,$1
| cmpule $16,$17,$3
| bne $3,$memmove_up /* dest < src */
|
| and $4,7,$1
| bne $2,$misaligned_dn
| unop
| beq $1,$skip_aligned_byte_loop_head_dn
|
| $aligned_byte_loop_head_dn:
| lda $4,-1($4)
| lda $5,-1($5)
| unop
| ble $18,$egress
|
| ldq_u $3,0($5)
| ldq_u $2,0($4)
| lda $18,-1($18)
| extbl $3,$5,$1
|
| insbl $1,$4,$1
| mskbl $2,$4,$2
| bis $1,$2,$1
| and $4,7,$6
|
| stq_u $1,0($4)
| bne $6,$aligned_byte_loop_head_dn
|
| $skip_aligned_byte_loop_head_dn:
| lda $18,-8($18)
| blt $18,$skip_aligned_word_loop_dn
|
| $aligned_word_loop_dn:
| ldq $1,-8($5)
| nop
| lda $5,-8($5)
| lda $18,-8($18)
|
| stq $1,-8($4)
| nop
| lda $4,-8($4)
| bge $18,$aligned_word_loop_dn
|
| $skip_aligned_word_loop_dn:
| lda $18,8($18)
| bgt $18,$byte_loop_tail_dn
| unop
| ret $31,($26),1
|
| .align 4
| $misaligned_dn:
| nop
| fnop
| unop
| beq $18,$egress
|
| $byte_loop_tail_dn:
| ldq_u $3,-1($5)
| ldq_u $2,-1($4)
| lda $5,-1($5)
| lda $4,-1($4)
|
| lda $18,-1($18)
| extbl $3,$5,$1
| insbl $1,$4,$1
| mskbl $2,$4,$2
|
| bis $1,$2,$1
| stq_u $1,0($4)
| bgt $18,$byte_loop_tail_dn
| br $egress
|
| $memmove_up:
| mov $16,$4
| mov $17,$5
| bne $2,$misaligned_up
| beq $1,$skip_aligned_byte_loop_head_up
|
| $aligned_byte_loop_head_up:
| unop
| ble $18,$egress
| ldq_u $3,0($5)
| ldq_u $2,0($4)
|
| lda $18,-1($18)
| extbl $3,$5,$1
| insbl $1,$4,$1
| mskbl $2,$4,$2
|
| bis $1,$2,$1
| lda $5,1($5)
| stq_u $1,0($4)
| lda $4,1($4)
|
| and $4,7,$6
| bne $6,$aligned_byte_loop_head_up
|
| $skip_aligned_byte_loop_head_up:
| lda $18,-8($18)
| blt $18,$skip_aligned_word_loop_up
|
| $aligned_word_loop_up:
| ldq $1,0($5)
| nop
| lda $5,8($5)
| lda $18,-8($18)
|
| stq $1,0($4)
| nop
| lda $4,8($4)
| bge $18,$aligned_word_loop_up
|
| $skip_aligned_word_loop_up:
| lda $18,8($18)
| bgt $18,$byte_loop_tail_up
| unop
| ret $31,($26),1
|
| .align 4
| $misaligned_up:
| nop
| fnop
| unop
| beq $18,$egress
|
| $byte_loop_tail_up:
| ldq_u $3,0($5)
| ldq_u $2,0($4)
| lda $18,-1($18)
| extbl $3,$5,$1
|
| insbl $1,$4,$1
| mskbl $2,$4,$2
| bis $1,$2,$1
| stq_u $1,0($4)
|
| lda $5,1($5)
| lda $4,1($4)
| nop
| bgt $18,$byte_loop_tail_up
|
| $egress:
| ret $31,($26),1
| nop
| nop
| nop
|
| .end memmove
| EXPORT_SYMBOL(memmove)
|
|
