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/* wcsrchr with SSE2, without using bsf instructions.
Copyright (C) 2011-2019 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
<https://www.gnu.org/licenses/>. */
#if IS_IN (libc)
# include <sysdep.h>
# 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)
# define PARMS 8
# define ENTRANCE PUSH (%edi);
# define RETURN POP (%edi); ret; CFI_PUSH (%edi);
# define STR1 PARMS
# define STR2 STR1+4
atom_text_section
ENTRY (__wcsrchr_sse2)
ENTRANCE
mov STR1(%esp), %ecx
movd STR2(%esp), %xmm1
mov %ecx, %edi
punpckldq %xmm1, %xmm1
pxor %xmm2, %xmm2
punpckldq %xmm1, %xmm1
/* ECX has OFFSET. */
and $63, %ecx
cmp $48, %ecx
ja L(crosscache)
/* unaligned string. */
movdqu (%edi), %xmm0
pcmpeqd %xmm0, %xmm2
pcmpeqd %xmm1, %xmm0
/* Find where NULL is. */
pmovmskb %xmm2, %ecx
/* Check if there is a match. */
pmovmskb %xmm0, %eax
add $16, %edi
test %eax, %eax
jnz L(unaligned_match1)
test %ecx, %ecx
jnz L(return_null)
and $-16, %edi
PUSH (%esi)
xor %edx, %edx
jmp L(loop)
CFI_POP (%esi)
.p2align 4
L(unaligned_match1):
test %ecx, %ecx
jnz L(prolog_find_zero_1)
PUSH (%esi)
/* Save current match */
mov %eax, %edx
mov %edi, %esi
and $-16, %edi
jmp L(loop)
CFI_POP (%esi)
.p2align 4
L(crosscache):
/* Hancle unaligned string. */
and $15, %ecx
and $-16, %edi
pxor %xmm3, %xmm3
movdqa (%edi), %xmm0
pcmpeqd %xmm0, %xmm3
pcmpeqd %xmm1, %xmm0
/* Find where NULL is. */
pmovmskb %xmm3, %edx
/* Check if there is a match. */
pmovmskb %xmm0, %eax
/* Remove the leading bytes. */
shr %cl, %edx
shr %cl, %eax
add $16, %edi
test %eax, %eax
jnz L(unaligned_match)
test %edx, %edx
jnz L(return_null)
PUSH (%esi)
xor %edx, %edx
jmp L(loop)
CFI_POP (%esi)
.p2align 4
L(unaligned_match):
test %edx, %edx
jnz L(prolog_find_zero)
PUSH (%esi)
mov %eax, %edx
lea (%edi, %ecx), %esi
/* Loop start on aligned string. */
.p2align 4
L(loop):
movdqa (%edi), %xmm0
pcmpeqd %xmm0, %xmm2
add $16, %edi
pcmpeqd %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm3
pcmpeqd %xmm3, %xmm2
add $16, %edi
pcmpeqd %xmm1, %xmm3
pmovmskb %xmm2, %ecx
pmovmskb %xmm3, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm4
pcmpeqd %xmm4, %xmm2
add $16, %edi
pcmpeqd %xmm1, %xmm4
pmovmskb %xmm2, %ecx
pmovmskb %xmm4, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm5
pcmpeqd %xmm5, %xmm2
add $16, %edi
pcmpeqd %xmm1, %xmm5
pmovmskb %xmm2, %ecx
pmovmskb %xmm5, %eax
or %eax, %ecx
jz L(loop)
.p2align 4
L(matches):
test %eax, %eax
jnz L(match)
L(return_value):
test %edx, %edx
jz L(return_null_1)
mov %edx, %eax
mov %esi, %edi
POP (%esi)
test %ah, %ah
jnz L(match_third_or_fourth_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%edi), %eax
RETURN
CFI_PUSH (%esi)
.p2align 4
L(return_null_1):
POP (%esi)
xor %eax, %eax
RETURN
CFI_PUSH (%esi)
.p2align 4
L(match):
pmovmskb %xmm2, %ecx
test %ecx, %ecx
jnz L(find_zero)
/* save match info */
mov %eax, %edx
mov %edi, %esi
jmp L(loop)
.p2align 4
L(find_zero):
test %cl, %cl
jz L(find_zero_in_third_or_fourth_wchar)
test $15, %cl
jz L(find_zero_in_second_wchar)
and $1, %eax
jz L(return_value)
POP (%esi)
lea -16(%edi), %eax
RETURN
CFI_PUSH (%esi)
.p2align 4
L(find_zero_in_second_wchar):
and $1 << 5 - 1, %eax
jz L(return_value)
POP (%esi)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%edi), %eax
RETURN
CFI_PUSH (%esi)
.p2align 4
L(find_zero_in_third_or_fourth_wchar):
test $15, %ch
jz L(find_zero_in_fourth_wchar)
and $1 << 9 - 1, %eax
jz L(return_value)
POP (%esi)
test %ah, %ah
jnz L(match_third_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%edi), %eax
RETURN
CFI_PUSH (%esi)
.p2align 4
L(find_zero_in_fourth_wchar):
POP (%esi)
test %ah, %ah
jnz L(match_third_or_fourth_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%edi), %eax
RETURN
CFI_PUSH (%esi)
.p2align 4
L(match_second_wchar):
lea -12(%edi), %eax
RETURN
.p2align 4
L(match_third_or_fourth_wchar):
test $15 << 4, %ah
jnz L(match_fourth_wchar)
lea -8(%edi), %eax
RETURN
.p2align 4
L(match_third_wchar):
lea -8(%edi), %eax
RETURN
.p2align 4
L(match_fourth_wchar):
lea -4(%edi), %eax
RETURN
.p2align 4
L(return_null):
xor %eax, %eax
RETURN
.p2align 4
L(prolog_find_zero):
add %ecx, %edi
mov %edx, %ecx
L(prolog_find_zero_1):
test %cl, %cl
jz L(prolog_find_zero_in_third_or_fourth_wchar)
test $15, %cl
jz L(prolog_find_zero_in_second_wchar)
and $1, %eax
jz L(return_null)
lea -16(%edi), %eax
RETURN
.p2align 4
L(prolog_find_zero_in_second_wchar):
and $1 << 5 - 1, %eax
jz L(return_null)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%edi), %eax
RETURN
.p2align 4
L(prolog_find_zero_in_third_or_fourth_wchar):
test $15, %ch
jz L(prolog_find_zero_in_fourth_wchar)
and $1 << 9 - 1, %eax
jz L(return_null)
test %ah, %ah
jnz L(match_third_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%edi), %eax
RETURN
.p2align 4
L(prolog_find_zero_in_fourth_wchar):
test %ah, %ah
jnz L(match_third_or_fourth_wchar)
test $15 << 4, %al
jnz L(match_second_wchar)
lea -16(%edi), %eax
RETURN
END (__wcsrchr_sse2)
#endif
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