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amd64: remove now unused bzero, bcmp and bcopy. move pagecopy higher up.

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This commit is contained in:
Mateusz Guzik 2018-06-08 04:18:42 +00:00
parent ea99223ec9
commit dfa5753e09
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=334826
1 changed files with 15 additions and 124 deletions
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139
sys/amd64/amd64/support.S
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@ -40,27 +40,6 @@
.text
/*
* bcopy family
* void bzero(void *buf, u_int len)
*/
/* done */
ENTRY(bzero)
PUSH_FRAME_POINTER
movq %rsi,%rcx
xorl %eax,%eax
shrq $3,%rcx
rep
stosq
movq %rsi,%rcx
andq $7,%rcx
rep
stosb
POP_FRAME_POINTER
ret
END(bzero)
/* Address: %rdi */
ENTRY(pagezero)
PUSH_FRAME_POINTER
@ -72,6 +51,21 @@ ENTRY(pagezero)
ret
END(pagezero)
/*
* pagecopy(%rdi=from, %rsi=to)
*/
ENTRY(pagecopy)
PUSH_FRAME_POINTER
movq $PAGE_SIZE/8,%rcx
movq %rdi,%r9
movq %rsi,%rdi
movq %r9,%rsi
rep
movsq
POP_FRAME_POINTER
ret
END(pagecopy)
/* Address: %rdi */
ENTRY(sse2_pagezero)
PUSH_FRAME_POINTER
@ -96,94 +90,6 @@ ENTRY(sse2_pagezero)
ret
END(sse2_pagezero)
ENTRY(bcmp)
PUSH_FRAME_POINTER
test %rdx,%rdx
je 1f
cmpq $64,%rdx
jg 4f
xor %ecx,%ecx
2:
movzbl (%rdi,%rcx,1),%eax
movzbl (%rsi,%rcx,1),%r8d
cmp %r8b,%al
jne 3f
add $0x1,%rcx
cmp %rcx,%rdx
jne 2b
1:
xor %eax,%eax
POP_FRAME_POINTER
retq
3:
mov $1,%eax
POP_FRAME_POINTER
retq
4:
movq %rdx,%rcx
shrq $3,%rcx
repe
cmpsq
jne 5f
movq %rdx,%rcx
andq $7,%rcx
repe
cmpsb
5:
setne %al
movsbl %al,%eax
POP_FRAME_POINTER
ret
END(bcmp)
/*
* bcopy(src, dst, cnt)
* rdi, rsi, rdx
* ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
*/
ENTRY(bcopy)
PUSH_FRAME_POINTER
xchgq %rsi,%rdi
movq %rdx,%rcx
movq %rdi,%rax
subq %rsi,%rax
cmpq %rcx,%rax /* overlapping && src < dst? */
jb 1f
shrq $3,%rcx /* copy by 64-bit words */
rep
movsq
movq %rdx,%rcx
andq $7,%rcx /* any bytes left? */
rep
movsb
POP_FRAME_POINTER
ret
/* ALIGN_TEXT */
1:
addq %rcx,%rdi /* copy backwards */
addq %rcx,%rsi
decq %rdi
decq %rsi
andq $7,%rcx /* any fractional bytes? */
std
rep
movsb
movq %rdx,%rcx /* copy remainder by 32-bit words */
shrq $3,%rcx
subq $7,%rsi
subq $7,%rdi
rep
movsq
cld
POP_FRAME_POINTER
ret
END(bcopy)
/*
* memmove(dst, src, cnt)
* rdi, rsi, rdx
@ -291,21 +197,6 @@ ENTRY(memset)
ret
END(memset)
/*
* pagecopy(%rdi=from, %rsi=to)
*/
ENTRY(pagecopy)
PUSH_FRAME_POINTER
movq $PAGE_SIZE/8,%rcx
movq %rdi,%r9
movq %rsi,%rdi
movq %r9,%rsi
rep
movsq
POP_FRAME_POINTER
ret
END(pagecopy)
/* fillw(pat, base, cnt) */
/* %rdi,%rsi, %rdx */
ENTRY(fillw)