mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
182 lines
2.6 KiB
ArmAsm
182 lines
2.6 KiB
ArmAsm
/*
|
|
* 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.
|
|
*/
|
|
|
|
.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
|