/* strrchr SSE2 without bsf and bsr
Copyright (C) 2011-2018 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/>. */
#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 (__strrchr_sse2)
ENTRANCE
mov STR1(%esp), %ecx
movd STR2(%esp), %xmm1
pxor %xmm2, %xmm2
mov %ecx, %edi
punpcklbw %xmm1, %xmm1
punpcklbw %xmm1, %xmm1
/* ECX has OFFSET. */
and $63, %ecx
cmp $48, %ecx
pshufd $0, %xmm1, %xmm1
ja L(crosscache)
/* unaligned string. */
movdqu (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
pcmpeqb %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)
PUSH (%ebx)
xor %ebx, %ebx
jmp L(loop)
CFI_POP (%esi)
CFI_POP (%ebx)
.p2align 4
L(unaligned_match1):
test %ecx, %ecx
jnz L(prolog_find_zero_1)
PUSH (%esi)
PUSH (%ebx)
mov %eax, %ebx
mov %edi, %esi
and $-16, %edi
jmp L(loop)
CFI_POP (%esi)
CFI_POP (%ebx)
.p2align 4
L(crosscache):
/* Hancle unaligned string. */
and $15, %ecx
and $-16, %edi
pxor %xmm3, %xmm3
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm3
pcmpeqb %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)
PUSH (%ebx)
xor %ebx, %ebx
jmp L(loop)
CFI_POP (%esi)
CFI_POP (%ebx)
.p2align 4
L(unaligned_match):
test %edx, %edx
jnz L(prolog_find_zero)
PUSH (%esi)
PUSH (%ebx)
mov %eax, %ebx
lea (%edi, %ecx), %esi
/* Loop start on aligned string. */
.p2align 4
L(loop):
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %edi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %edi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %edi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jnz L(matches)
movdqa (%edi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %edi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %ecx
pmovmskb %xmm0, %eax
or %eax, %ecx
jz L(loop)
L(matches):
test %eax, %eax
jnz L(match)
L(return_value):
test %ebx, %ebx
jz L(return_null_1)
mov %ebx, %eax
mov %esi, %edi
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(return_null_1):
POP (%ebx)
POP (%esi)
xor %eax, %eax
RETURN
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(match):
pmovmskb %xmm2, %ecx
test %ecx, %ecx
jnz L(find_zero)
mov %eax, %ebx
mov %edi, %esi
jmp L(loop)
.p2align 4
L(find_zero):
test %cl, %cl
jz L(find_zero_high)
mov %cl, %dl
and $15, %dl
jz L(find_zero_8)
test $0x01, %cl
jnz L(FindZeroExit1)
test $0x02, %cl
jnz L(FindZeroExit2)
test $0x04, %cl
jnz L(FindZeroExit3)
and $1 << 4 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(find_zero_8):
test $0x10, %cl
jnz L(FindZeroExit5)
test $0x20, %cl
jnz L(FindZeroExit6)
test $0x40, %cl
jnz L(FindZeroExit7)
and $1 << 8 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(find_zero_high):
mov %ch, %dh
and $15, %dh
jz L(find_zero_high_8)
test $0x01, %ch
jnz L(FindZeroExit9)
test $0x02, %ch
jnz L(FindZeroExit10)
test $0x04, %ch
jnz L(FindZeroExit11)
and $1 << 12 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(find_zero_high_8):
test $0x10, %ch
jnz L(FindZeroExit13)
test $0x20, %ch
jnz L(FindZeroExit14)
test $0x40, %ch
jnz L(FindZeroExit15)
and $1 << 16 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit1):
and $1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit2):
and $1 << 2 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit3):
and $1 << 3 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit5):
and $1 << 5 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit6):
and $1 << 6 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit7):
and $1 << 7 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit9):
and $1 << 9 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit10):
and $1 << 10 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit11):
and $1 << 11 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit13):
and $1 << 13 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit14):
and $1 << 14 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
jmp L(match_exit)
CFI_PUSH (%ebx)
CFI_PUSH (%esi)
.p2align 4
L(FindZeroExit15):
and $1 << 15 - 1, %eax
jz L(return_value)
POP (%ebx)
POP (%esi)
.p2align 4
L(match_exit):
test %ah, %ah
jnz L(match_exit_high)
mov %al, %dl
and $15 << 4, %dl
jnz L(match_exit_8)
test $0x08, %al
jnz L(Exit4)
test $0x04, %al
jnz L(Exit3)
test $0x02, %al
jnz L(Exit2)
lea -16(%edi), %eax
RETURN
.p2align 4
L(match_exit_8):
test $0x80, %al
jnz L(Exit8)
test $0x40, %al
jnz L(Exit7)
test $0x20, %al
jnz L(Exit6)
lea -12(%edi), %eax
RETURN
.p2align 4
L(match_exit_high):
mov %ah, %dh
and $15 << 4, %dh
jnz L(match_exit_high_8)
test $0x08, %ah
jnz L(Exit12)
test $0x04, %ah
jnz L(Exit11)
test $0x02, %ah
jnz L(Exit10)
lea -8(%edi), %eax
RETURN
.p2align 4
L(match_exit_high_8):
test $0x80, %ah
jnz L(Exit16)
test $0x40, %ah
jnz L(Exit15)
test $0x20, %ah
jnz L(Exit14)
lea -4(%edi), %eax
RETURN
.p2align 4
L(Exit2):
lea -15(%edi), %eax
RETURN
.p2align 4
L(Exit3):
lea -14(%edi), %eax
RETURN
.p2align 4
L(Exit4):
lea -13(%edi), %eax
RETURN
.p2align 4
L(Exit6):
lea -11(%edi), %eax
RETURN
.p2align 4
L(Exit7):
lea -10(%edi), %eax
RETURN
.p2align 4
L(Exit8):
lea -9(%edi), %eax
RETURN
.p2align 4
L(Exit10):
lea -7(%edi), %eax
RETURN
.p2align 4
L(Exit11):
lea -6(%edi), %eax
RETURN
.p2align 4
L(Exit12):
lea -5(%edi), %eax
RETURN
.p2align 4
L(Exit14):
lea -3(%edi), %eax
RETURN
.p2align 4
L(Exit15):
lea -2(%edi), %eax
RETURN
.p2align 4
L(Exit16):
lea -1(%edi), %eax
RETURN
/* Return NULL. */
.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_high)
mov %cl, %dl
and $15, %dl
jz L(prolog_find_zero_8)
test $0x01, %cl
jnz L(PrologFindZeroExit1)
test $0x02, %cl
jnz L(PrologFindZeroExit2)
test $0x04, %cl
jnz L(PrologFindZeroExit3)
and $1 << 4 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(prolog_find_zero_8):
test $0x10, %cl
jnz L(PrologFindZeroExit5)
test $0x20, %cl
jnz L(PrologFindZeroExit6)
test $0x40, %cl
jnz L(PrologFindZeroExit7)
and $1 << 8 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(prolog_find_zero_high):
mov %ch, %dh
and $15, %dh
jz L(prolog_find_zero_high_8)
test $0x01, %ch
jnz L(PrologFindZeroExit9)
test $0x02, %ch
jnz L(PrologFindZeroExit10)
test $0x04, %ch
jnz L(PrologFindZeroExit11)
and $1 << 12 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(prolog_find_zero_high_8):
test $0x10, %ch
jnz L(PrologFindZeroExit13)
test $0x20, %ch
jnz L(PrologFindZeroExit14)
test $0x40, %ch
jnz L(PrologFindZeroExit15)
and $1 << 16 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit1):
and $1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit2):
and $1 << 2 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit3):
and $1 << 3 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit5):
and $1 << 5 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit6):
and $1 << 6 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit7):
and $1 << 7 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit9):
and $1 << 9 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit10):
and $1 << 10 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit11):
and $1 << 11 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit13):
and $1 << 13 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit14):
and $1 << 14 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
.p2align 4
L(PrologFindZeroExit15):
and $1 << 15 - 1, %eax
jnz L(match_exit)
xor %eax, %eax
RETURN
END (__strrchr_sse2)
#endif