/* strlen with SSE2
Copyright (C) 2010-2018 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, see
<http://www.gnu.org/licenses/>. */
/* for strlen only SHARED version is optimized, for strcat, strncat, strnlen both STATIC and SHARED are optimized */
#if (defined USE_AS_STRNLEN || defined USE_AS_STRCAT || defined SHARED) && IS_IN (libc)
# ifndef USE_AS_STRCAT
# include <sysdep.h>
# define PARMS 4
# define STR PARMS
# define RETURN ret
# ifdef USE_AS_STRNLEN
# define LEN PARMS + 8
# define CFI_PUSH(REG) \
cfi_adjust_cfa_offset (4); \
cfi_rel_offset (REG, 0)
# define CFI_POP(REG) \
cfi_adjust_cfa_offset (-4); \
cfi_restore (REG)
# define PUSH(REG) pushl REG; CFI_PUSH (REG)
# define POP(REG) popl REG; CFI_POP (REG)
# undef RETURN
# define RETURN POP (%edi); CFI_PUSH(%edi); ret
# endif
# ifndef STRLEN
# define STRLEN __strlen_sse2
# endif
atom_text_section
ENTRY (STRLEN)
mov STR(%esp), %edx
# ifdef USE_AS_STRNLEN
PUSH (%edi)
movl LEN(%esp), %edi
sub $4, %edi
jbe L(len_less4_prolog)
# endif
# endif
xor %eax, %eax
cmpb $0, (%edx)
jz L(exit_tail0)
cmpb $0, 1(%edx)
jz L(exit_tail1)
cmpb $0, 2(%edx)
jz L(exit_tail2)
cmpb $0, 3(%edx)
jz L(exit_tail3)
# ifdef USE_AS_STRNLEN
sub $4, %edi
jbe L(len_less8_prolog)
# endif
cmpb $0, 4(%edx)
jz L(exit_tail4)
cmpb $0, 5(%edx)
jz L(exit_tail5)
cmpb $0, 6(%edx)
jz L(exit_tail6)
cmpb $0, 7(%edx)
jz L(exit_tail7)
# ifdef USE_AS_STRNLEN
sub $4, %edi
jbe L(len_less12_prolog)
# endif
cmpb $0, 8(%edx)
jz L(exit_tail8)
cmpb $0, 9(%edx)
jz L(exit_tail9)
cmpb $0, 10(%edx)
jz L(exit_tail10)
cmpb $0, 11(%edx)
jz L(exit_tail11)
# ifdef USE_AS_STRNLEN
sub $4, %edi
jbe L(len_less16_prolog)
# endif
cmpb $0, 12(%edx)
jz L(exit_tail12)
cmpb $0, 13(%edx)
jz L(exit_tail13)
cmpb $0, 14(%edx)
jz L(exit_tail14)
cmpb $0, 15(%edx)
jz L(exit_tail15)
pxor %xmm0, %xmm0
lea 16(%edx), %eax
mov %eax, %ecx
and $-16, %eax
# ifdef USE_AS_STRNLEN
and $15, %edx
add %edx, %edi
sub $64, %edi
jbe L(len_less64)
# endif
pcmpeqb (%eax), %xmm0
pmovmskb %xmm0, %edx
pxor %xmm1, %xmm1
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm1
pmovmskb %xmm1, %edx
pxor %xmm2, %xmm2
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm2
pmovmskb %xmm2, %edx
pxor %xmm3, %xmm3
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
# ifdef USE_AS_STRNLEN
sub $64, %edi
jbe L(len_less64)
# endif
pcmpeqb (%eax), %xmm0
pmovmskb %xmm0, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm1
pmovmskb %xmm1, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
# ifdef USE_AS_STRNLEN
sub $64, %edi
jbe L(len_less64)
# endif
pcmpeqb (%eax), %xmm0
pmovmskb %xmm0, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm1
pmovmskb %xmm1, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
# ifdef USE_AS_STRNLEN
sub $64, %edi
jbe L(len_less64)
# endif
pcmpeqb (%eax), %xmm0
pmovmskb %xmm0, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm1
pmovmskb %xmm1, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
pcmpeqb (%eax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 16(%eax), %eax
jnz L(exit)
# ifdef USE_AS_STRNLEN
mov %eax, %edx
and $63, %edx
add %edx, %edi
# endif
and $-0x40, %eax
.p2align 4
L(aligned_64_loop):
# ifdef USE_AS_STRNLEN
sub $64, %edi
jbe L(len_less64)
# endif
movaps (%eax), %xmm0
movaps 16(%eax), %xmm1
movaps 32(%eax), %xmm2
movaps 48(%eax), %xmm6
pminub %xmm1, %xmm0
pminub %xmm6, %xmm2
pminub %xmm0, %xmm2
pcmpeqb %xmm3, %xmm2
pmovmskb %xmm2, %edx
test %edx, %edx
lea 64(%eax), %eax
jz L(aligned_64_loop)
pcmpeqb -64(%eax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea 48(%ecx), %ecx
jnz L(exit)
pcmpeqb %xmm1, %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea -16(%ecx), %ecx
jnz L(exit)
pcmpeqb -32(%eax), %xmm3
pmovmskb %xmm3, %edx
test %edx, %edx
lea -16(%ecx), %ecx
jnz L(exit)
pcmpeqb %xmm6, %xmm3
pmovmskb %xmm3, %edx
lea -16(%ecx), %ecx
L(exit):
sub %ecx, %eax
test %dl, %dl
jz L(exit_high)
mov %dl, %cl
and $15, %cl
jz L(exit_8)
test $0x01, %dl
jnz L(exit_tail0)
test $0x02, %dl
jnz L(exit_tail1)
test $0x04, %dl
jnz L(exit_tail2)
add $3, %eax
RETURN
.p2align 4
L(exit_8):
test $0x10, %dl
jnz L(exit_tail4)
test $0x20, %dl
jnz L(exit_tail5)
test $0x40, %dl
jnz L(exit_tail6)
add $7, %eax
RETURN
.p2align 4
L(exit_high):
mov %dh, %ch
and $15, %ch
jz L(exit_high_8)
test $0x01, %dh
jnz L(exit_tail8)
test $0x02, %dh
jnz L(exit_tail9)
test $0x04, %dh
jnz L(exit_tail10)
add $11, %eax
RETURN
.p2align 4
L(exit_high_8):
test $0x10, %dh
jnz L(exit_tail12)
test $0x20, %dh
jnz L(exit_tail13)
test $0x40, %dh
jnz L(exit_tail14)
add $15, %eax
L(exit_tail0):
RETURN
# ifdef USE_AS_STRNLEN
.p2align 4
L(len_less64):
pxor %xmm0, %xmm0
add $64, %edi
pcmpeqb (%eax), %xmm0
pmovmskb %xmm0, %edx
pxor %xmm1, %xmm1
lea 16(%eax), %eax
test %edx, %edx
jnz L(strnlen_exit)
sub $16, %edi
jbe L(return_start_len)
pcmpeqb (%eax), %xmm1
pmovmskb %xmm1, %edx
lea 16(%eax), %eax
test %edx, %edx
jnz L(strnlen_exit)
sub $16, %edi
jbe L(return_start_len)
pcmpeqb (%eax), %xmm0
pmovmskb %xmm0, %edx
lea 16(%eax), %eax
test %edx, %edx
jnz L(strnlen_exit)
sub $16, %edi
jbe L(return_start_len)
pcmpeqb (%eax), %xmm1
pmovmskb %xmm1, %edx
lea 16(%eax), %eax
test %edx, %edx
jnz L(strnlen_exit)
movl LEN(%esp), %eax
RETURN
.p2align 4
L(strnlen_exit):
sub %ecx, %eax
test %dl, %dl
jz L(strnlen_exit_high)
mov %dl, %cl
and $15, %cl
jz L(strnlen_exit_8)
test $0x01, %dl
jnz L(exit_tail0)
test $0x02, %dl
jnz L(strnlen_exit_tail1)
test $0x04, %dl
jnz L(strnlen_exit_tail2)
sub $4, %edi
jb L(return_start_len)
lea 3(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_8):
test $0x10, %dl
jnz L(strnlen_exit_tail4)
test $0x20, %dl
jnz L(strnlen_exit_tail5)
test $0x40, %dl
jnz L(strnlen_exit_tail6)
sub $8, %edi
jb L(return_start_len)
lea 7(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_high):
mov %dh, %ch
and $15, %ch
jz L(strnlen_exit_high_8)
test $0x01, %dh
jnz L(strnlen_exit_tail8)
test $0x02, %dh
jnz L(strnlen_exit_tail9)
test $0x04, %dh
jnz L(strnlen_exit_tail10)
sub $12, %edi
jb L(return_start_len)
lea 11(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_high_8):
test $0x10, %dh
jnz L(strnlen_exit_tail12)
test $0x20, %dh
jnz L(strnlen_exit_tail13)
test $0x40, %dh
jnz L(strnlen_exit_tail14)
sub $16, %edi
jb L(return_start_len)
lea 15(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail1):
sub $2, %edi
jb L(return_start_len)
lea 1(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail2):
sub $3, %edi
jb L(return_start_len)
lea 2(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail4):
sub $5, %edi
jb L(return_start_len)
lea 4(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail5):
sub $6, %edi
jb L(return_start_len)
lea 5(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail6):
sub $7, %edi
jb L(return_start_len)
lea 6(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail8):
sub $9, %edi
jb L(return_start_len)
lea 8(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail9):
sub $10, %edi
jb L(return_start_len)
lea 9(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail10):
sub $11, %edi
jb L(return_start_len)
lea 10(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail12):
sub $13, %edi
jb L(return_start_len)
lea 12(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail13):
sub $14, %edi
jb L(return_start_len)
lea 13(%eax), %eax
RETURN
.p2align 4
L(strnlen_exit_tail14):
sub $15, %edi
jb L(return_start_len)
lea 14(%eax), %eax
RETURN
.p2align 4
L(return_start_len):
movl LEN(%esp), %eax
RETURN
/* for prolog only */
.p2align 4
L(len_less4_prolog):
xor %eax, %eax
add $4, %edi
jz L(exit_tail0)
cmpb $0, (%edx)
jz L(exit_tail0)
cmp $1, %edi
je L(exit_tail1)
cmpb $0, 1(%edx)
jz L(exit_tail1)
cmp $2, %edi
je L(exit_tail2)
cmpb $0, 2(%edx)
jz L(exit_tail2)
cmp $3, %edi
je L(exit_tail3)
cmpb $0, 3(%edx)
jz L(exit_tail3)
mov $4, %eax
RETURN
.p2align 4
L(len_less8_prolog):
add $4, %edi
cmpb $0, 4(%edx)
jz L(exit_tail4)
cmp $1, %edi
je L(exit_tail5)
cmpb $0, 5(%edx)
jz L(exit_tail5)
cmp $2, %edi
je L(exit_tail6)
cmpb $0, 6(%edx)
jz L(exit_tail6)
cmp $3, %edi
je L(exit_tail7)
cmpb $0, 7(%edx)
jz L(exit_tail7)
mov $8, %eax
RETURN
.p2align 4
L(len_less12_prolog):
add $4, %edi
cmpb $0, 8(%edx)
jz L(exit_tail8)
cmp $1, %edi
je L(exit_tail9)
cmpb $0, 9(%edx)
jz L(exit_tail9)
cmp $2, %edi
je L(exit_tail10)
cmpb $0, 10(%edx)
jz L(exit_tail10)
cmp $3, %edi
je L(exit_tail11)
cmpb $0, 11(%edx)
jz L(exit_tail11)
mov $12, %eax
RETURN
.p2align 4
L(len_less16_prolog):
add $4, %edi
cmpb $0, 12(%edx)
jz L(exit_tail12)
cmp $1, %edi
je L(exit_tail13)
cmpb $0, 13(%edx)
jz L(exit_tail13)
cmp $2, %edi
je L(exit_tail14)
cmpb $0, 14(%edx)
jz L(exit_tail14)
cmp $3, %edi
je L(exit_tail15)
cmpb $0, 15(%edx)
jz L(exit_tail15)
mov $16, %eax
RETURN
# endif
.p2align 4
L(exit_tail1):
add $1, %eax
RETURN
L(exit_tail2):
add $2, %eax
RETURN
L(exit_tail3):
add $3, %eax
RETURN
L(exit_tail4):
add $4, %eax
RETURN
L(exit_tail5):
add $5, %eax
RETURN
L(exit_tail6):
add $6, %eax
RETURN
L(exit_tail7):
add $7, %eax
RETURN
L(exit_tail8):
add $8, %eax
RETURN
L(exit_tail9):
add $9, %eax
RETURN
L(exit_tail10):
add $10, %eax
RETURN
L(exit_tail11):
add $11, %eax
RETURN
L(exit_tail12):
add $12, %eax
RETURN
L(exit_tail13):
add $13, %eax
RETURN
L(exit_tail14):
add $14, %eax
RETURN
L(exit_tail15):
add $15, %eax
# ifndef USE_AS_STRCAT
RETURN
END (STRLEN)
# endif
#endif