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/* strlen without BSF
Copyright (C) 2010 Free Software Foundation, Inc.
Contributed by Intel Corporation.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#if defined SHARED && !defined NOT_IN_libc
#include <sysdep.h>
.text
ENTRY (__strlen_no_bsf)
xor %eax, %eax
cmpb $0, (%rdi)
jz L(exit_tail0)
cmpb $0, 1(%rdi)
jz L(exit_tail1)
cmpb $0, 2(%rdi)
jz L(exit_tail2)
cmpb $0, 3(%rdi)
jz L(exit_tail3)
cmpb $0, 4(%rdi)
jz L(exit_tail4)
cmpb $0, 5(%rdi)
jz L(exit_tail5)
cmpb $0, 6(%rdi)
jz L(exit_tail6)
cmpb $0, 7(%rdi)
jz L(exit_tail7)
cmpb $0, 8(%rdi)
jz L(exit_tail8)
cmpb $0, 9(%rdi)
jz L(exit_tail9)
cmpb $0, 10(%rdi)
jz L(exit_tail10)
cmpb $0, 11(%rdi)
jz L(exit_tail11)
cmpb $0, 12(%rdi)
jz L(exit_tail12)
cmpb $0, 13(%rdi)
jz L(exit_tail13)
cmpb $0, 14(%rdi)
jz L(exit_tail14)
cmpb $0, 15(%rdi)
jz L(exit_tail15)
pxor %xmm0, %xmm0
mov %rdi, %rcx
mov %rdi, %rax
and $-16, %rax
add $16, %rax
add $16, %rcx
pcmpeqb (%rax), %xmm0
pmovmskb %xmm0, %edx
pxor %xmm1, %xmm1
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm1
pmovmskb %xmm1, %edx
pxor %xmm2, %xmm2
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm2
pmovmskb %xmm2, %edx
pxor %xmm3, %xmm3
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm0
pmovmskb %xmm0, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm1
pmovmskb %xmm1, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm0
pmovmskb %xmm0, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm1
pmovmskb %xmm1, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm0
pmovmskb %xmm0, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm1
pmovmskb %xmm1, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
pcmpeqb (%rax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%rax), %rax
jnz L(exit)
and $-0x40, %rax
xor %r8d, %r8d
L(aligned_64):
pcmpeqb (%rax), %xmm0
pcmpeqb 16(%rax), %xmm1
pcmpeqb 32(%rax), %xmm2
pcmpeqb 48(%rax), %xmm3
pmovmskb %xmm0, %edx
pmovmskb %xmm1, %esi
pmovmskb %xmm2, %edi
pmovmskb %xmm3, %r9d
or %edx, %r8d
or %esi, %r8d
or %edi, %r8d
or %r9d, %r8d
lea 64(%rax), %rax
jz L(aligned_64)
test %edx, %edx
jnz L(aligned_64_exit_16)
test %esi, %esi
jnz L(aligned_64_exit_32)
test %edi, %edi
jnz L(aligned_64_exit_48)
L(aligned_64_exit_64):
mov %r9d, %edx
jmp L(aligned_64_exit)
L(aligned_64_exit_48):
lea -16(%rax), %rax
mov %edi, %edx
jmp L(aligned_64_exit)
L(aligned_64_exit_32):
lea -32(%rax), %rax
mov %esi, %edx
jmp L(aligned_64_exit)
L(aligned_64_exit_16):
lea -48(%rax), %rax
L(aligned_64_exit):
L(exit):
sub %rcx, %rax
test %dl, %dl
jz L(exit_high)
test $0x01, %dl
jnz L(exit_tail0)
test $0x02, %dl
jnz L(exit_tail1)
test $0x04, %dl
jnz L(exit_tail2)
test $0x08, %dl
jnz L(exit_tail3)
test $0x10, %dl
jnz L(exit_tail4)
test $0x20, %dl
jnz L(exit_tail5)
test $0x40, %dl
jnz L(exit_tail6)
add $7, %eax
L(exit_tail0):
ret
L(exit_high):
add $8, %eax
test $0x01, %dh
jnz L(exit_tail0)
test $0x02, %dh
jnz L(exit_tail1)
test $0x04, %dh
jnz L(exit_tail2)
test $0x08, %dh
jnz L(exit_tail3)
test $0x10, %dh
jnz L(exit_tail4)
test $0x20, %dh
jnz L(exit_tail5)
test $0x40, %dh
jnz L(exit_tail6)
add $7, %eax
ret
.p2align 4
L(exit_tail1):
add $1, %eax
ret
L(exit_tail2):
add $2, %eax
ret
L(exit_tail3):
add $3, %eax
ret
L(exit_tail4):
add $4, %eax
ret
L(exit_tail5):
add $5, %eax
ret
L(exit_tail6):
add $6, %eax
ret
L(exit_tail7):
add $7, %eax
ret
L(exit_tail8):
add $8, %eax
ret
L(exit_tail9):
add $9, %eax
ret
L(exit_tail10):
add $10, %eax
ret
L(exit_tail11):
add $11, %eax
ret
L(exit_tail12):
add $12, %eax
ret
L(exit_tail13):
add $13, %eax
ret
L(exit_tail14):
add $14, %eax
ret
L(exit_tail15):
add $15, %eax
ret
END (__strlen_no_bsf)
#endif
|
