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Faster strrchr.

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This commit is contained in:
Ondřej Bílka 2013-09-26 18:54:09 +02:00
parent 5ebbff8fd1
commit dc1a95c730
7 changed files with 211 additions and 946 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2013-09-26 Ondřej Bílka <neleai@seznam.cz>
* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Update.
* sysdeps/x86_64/multiarch/ifunc-impl-list.c: Remove strrchr ifunc.
* sysdeps/x86_64/multiarch/strend-sse4.S Remove.
* sysdeps/x86_64/multiarch/strrchr-sse2-no-bsf.S Likewise.
* sysdeps/x86_64/multiarch/strrchr.S: Likewise.
* sysdeps/x86_64/strrchr.S (strrchr): Use optimized implementation.
2013-09-25 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc64/stackguard-macros.h (POINTER_CHK_GUARD:

4
sysdeps/x86_64/multiarch/Makefile
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@ -8,7 +8,7 @@ ifeq ($(subdir),string)
sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
strcmp-sse2-unaligned strncmp-ssse3 \
strend-sse4 memcmp-sse4 memcpy-ssse3 \
memcmp-sse4 memcpy-ssse3 \
memcpy-sse2-unaligned mempcpy-ssse3 \
memmove-ssse3 memcpy-ssse3-back mempcpy-ssse3-back \
memmove-ssse3-back strcasestr-nonascii strcasecmp_l-ssse3 \
@ -17,7 +17,7 @@ sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
strcpy-sse2-unaligned strncpy-sse2-unaligned \
stpcpy-sse2-unaligned stpncpy-sse2-unaligned \
strcat-sse2-unaligned strncat-sse2-unaligned \
strrchr-sse2-no-bsf strchr-sse2-no-bsf memcmp-ssse3
strchr-sse2-no-bsf memcmp-ssse3
ifeq (yes,$(config-cflags-sse4))
sysdep_routines += strcspn-c strpbrk-c strspn-c strstr-c strcasestr-c varshift
CFLAGS-varshift.c += -msse4

6
sysdeps/x86_64/multiarch/ifunc-impl-list.c
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@ -176,12 +176,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
__strpbrk_sse42)
IFUNC_IMPL_ADD (array, i, strpbrk, 1, __strpbrk_sse2))
/* Support sysdeps/x86_64/multiarch/strrchr.S. */
IFUNC_IMPL (i, name, strrchr,
IFUNC_IMPL_ADD (array, i, strrchr, HAS_SSE4_2,
__strrchr_sse42)
IFUNC_IMPL_ADD (array, i, strrchr, 1, __strrchr_sse2_no_bsf)
IFUNC_IMPL_ADD (array, i, strrchr, 1, __strrchr_sse2))
/* Support sysdeps/x86_64/multiarch/strspn.S. */
IFUNC_IMPL (i, name, strspn,

48
sysdeps/x86_64/multiarch/strend-sse4.S
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@ -1,48 +0,0 @@
/* Return the pointer to the end of string, using SSE4.2
Copyright (C) 2009-2013 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/>. */
#include <sysdep.h>
#include "asm-syntax.h"
.section .text.sse4.2,"ax",@progbits
ENTRY (__strend_sse4)
pxor %xmm2, %xmm2
movq %rdi, %rcx
andq $~15, %rdi
movdqa %xmm2, %xmm1
pcmpeqb (%rdi), %xmm2
orl $0xffffffff, %esi
subq %rdi, %rcx
shll %cl, %esi
pmovmskb %xmm2, %edx
andl %esi, %edx
jnz 1f
2: pcmpistri $0x08, 16(%rdi), %xmm1
leaq 16(%rdi), %rdi
jnz 2b
leaq (%rdi,%rcx), %rax
ret
1: bsfl %edx, %eax
addq %rdi, %rax
ret
END (__strend_sse4)

555
sysdeps/x86_64/multiarch/strrchr-sse2-no-bsf.S
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@ -1,555 +0,0 @@
/* strrchr with SSE2 without bsf and bsr
Copyright (C) 2011-2013 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 defined SHARED && !defined NOT_IN_libc
# include <sysdep.h>
# include "asm-syntax.h"
atom_text_section
ENTRY (__strrchr_sse2_no_bsf)
movd %rsi, %xmm1
pxor %xmm2, %xmm2
mov %rdi, %rcx
punpcklbw %xmm1, %xmm1
punpcklbw %xmm1, %xmm1
/* ECX has OFFSET. */
and $63, %rcx
cmp $48, %rcx
pshufd $0, %xmm1, %xmm1
ja L(crosscache)
/* unaligned string. */
movdqu (%rdi), %xmm0
pcmpeqb %xmm0, %xmm2
pcmpeqb %xmm1, %xmm0
/* Find where NULL is. */
pmovmskb %xmm2, %rcx
/* Check if there is a match. */
pmovmskb %xmm0, %rax
add $16, %rdi
test %rax, %rax
jnz L(unaligned_match1)
test %rcx, %rcx
jnz L(return_null)
and $-16, %rdi
xor %r8, %r8
jmp L(loop)
.p2align 4
L(unaligned_match1):
test %rcx, %rcx
jnz L(prolog_find_zero_1)
mov %rax, %r8
mov %rdi, %rsi
and $-16, %rdi
jmp L(loop)
.p2align 4
L(crosscache):
/* Hancle unaligned string. */
and $15, %rcx
and $-16, %rdi
pxor %xmm3, %xmm3
movdqa (%rdi), %xmm0
pcmpeqb %xmm0, %xmm3
pcmpeqb %xmm1, %xmm0
/* Find where NULL is. */
pmovmskb %xmm3, %rdx
/* Check if there is a match. */
pmovmskb %xmm0, %rax
/* Remove the leading bytes. */
shr %cl, %rdx
shr %cl, %rax
add $16, %rdi
test %rax, %rax
jnz L(unaligned_match)
test %rdx, %rdx
jnz L(return_null)
xor %r8, %r8
jmp L(loop)
.p2align 4
L(unaligned_match):
test %rdx, %rdx
jnz L(prolog_find_zero)
mov %rax, %r8
lea (%rdi, %rcx), %rsi
/* Loop start on aligned string. */
.p2align 4
L(loop):
movdqa (%rdi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %rdi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %rcx
pmovmskb %xmm0, %rax
or %rax, %rcx
jnz L(matches)
movdqa (%rdi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %rdi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %rcx
pmovmskb %xmm0, %rax
or %rax, %rcx
jnz L(matches)
movdqa (%rdi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %rdi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %rcx
pmovmskb %xmm0, %rax
or %rax, %rcx
jnz L(matches)
movdqa (%rdi), %xmm0
pcmpeqb %xmm0, %xmm2
add $16, %rdi
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm2, %rcx
pmovmskb %xmm0, %rax
or %rax, %rcx
jz L(loop)
L(matches):
test %rax, %rax
jnz L(match)
L(return_value):
test %r8, %r8
jz L(return_null)
mov %r8, %rax
mov %rsi, %rdi
jmp L(match_exit)
.p2align 4
L(match):
pmovmskb %xmm2, %rcx
test %rcx, %rcx
jnz L(find_zero)
mov %rax, %r8
mov %rdi, %rsi
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, %rax
jz L(return_value)
jmp L(match_exit)
.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, %rax
jz L(return_value)
jmp L(match_exit)
.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, %rax
jz L(return_value)
jmp L(match_exit)
.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, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit1):
and $1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit2):
and $1 << 2 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit3):
and $1 << 3 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit5):
and $1 << 5 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit6):
and $1 << 6 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit7):
and $1 << 7 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit9):
and $1 << 9 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit10):
and $1 << 10 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit11):
and $1 << 11 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit13):
and $1 << 13 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit14):
and $1 << 14 - 1, %rax
jz L(return_value)
jmp L(match_exit)
.p2align 4
L(FindZeroExit15):
and $1 << 15 - 1, %rax
jz L(return_value)
.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(%rdi), %rax
ret
.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(%rdi), %rax
ret
.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(%rdi), %rax
ret
.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(%rdi), %rax
ret
.p2align 4
L(Exit2):
lea -15(%rdi), %rax
ret
.p2align 4
L(Exit3):
lea -14(%rdi), %rax
ret
.p2align 4
L(Exit4):
lea -13(%rdi), %rax
ret
.p2align 4
L(Exit6):
lea -11(%rdi), %rax
ret
.p2align 4
L(Exit7):
lea -10(%rdi), %rax
ret
.p2align 4
L(Exit8):
lea -9(%rdi), %rax
ret
.p2align 4
L(Exit10):
lea -7(%rdi), %rax
ret
.p2align 4
L(Exit11):
lea -6(%rdi), %rax
ret
.p2align 4
L(Exit12):
lea -5(%rdi), %rax
ret
.p2align 4
L(Exit14):
lea -3(%rdi), %rax
ret
.p2align 4
L(Exit15):
lea -2(%rdi), %rax
ret
.p2align 4
L(Exit16):
lea -1(%rdi), %rax
ret
/* Return NULL. */
.p2align 4
L(return_null):
xor %rax, %rax
ret
.p2align 4
L(prolog_find_zero):
add %rcx, %rdi
mov %rdx, %rcx
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, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.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, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.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, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.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, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit1):
and $1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit2):
and $1 << 2 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit3):
and $1 << 3 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit5):
and $1 << 5 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit6):
and $1 << 6 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit7):
and $1 << 7 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit9):
and $1 << 9 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit10):
and $1 << 10 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit11):
and $1 << 11 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit13):
and $1 << 13 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit14):
and $1 << 14 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
.p2align 4
L(PrologFindZeroExit15):
and $1 << 15 - 1, %rax
jnz L(match_exit)
xor %rax, %rax
ret
END (__strrchr_sse2_no_bsf)
#endif

288
sysdeps/x86_64/multiarch/strrchr.S
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@ -1,288 +0,0 @@
/* Multiple versions of strrchr
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2009-2013 Free Software Foundation, Inc.
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/>. */
#include <sysdep.h>
#include <init-arch.h>
/* Define multiple versions only for the definition in libc and for
the DSO. In static binaries we need strrchr before the initialization
happened. */
#if defined SHARED && !defined NOT_IN_libc
.text
ENTRY(strrchr)
.type strrchr, @gnu_indirect_function
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
jne 1f
call __init_cpu_features
1: leaq __strrchr_sse2(%rip), %rax
testl $bit_Slow_SSE4_2, __cpu_features+CPUID_OFFSET+index_Slow_SSE4_2(%rip)
jnz 2f
testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
jz 2f
leaq __strrchr_sse42(%rip), %rax
ret
2: testl $bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip)
jz 3f
leaq __strrchr_sse2_no_bsf(%rip), %rax
3: ret
END(strrchr)
/*
This implementation uses SSE4 instructions to compare up to 16 bytes
at a time looking for the last occurrence of the character c in the
string s:
char *strrchr (const char *s, int c);
We use 0x4a:
_SIDD_SBYTE_OPS
| _SIDD_CMP_EQUAL_EACH
| _SIDD_MOST_SIGNIFICANT
on pcmpistri to compare xmm/mem128
0 1 2 3 4 5 6 7 8 9 A B C D E F
X X X X X X X X X X X X X X X X
against xmm
0 1 2 3 4 5 6 7 8 9 A B C D E F
C C C C C C C C C C C C C C C C
to find out if the first 16byte data element has a byte C and the
last offset. There are 4 cases:
1. The first 16byte data element has EOS and has the byte C at the
last offset X.
2. The first 16byte data element is valid and has the byte C at the
last offset X.
3. The first 16byte data element has EOS and doesn't have the byte C.
4. The first 16byte data element is valid and doesn't have the byte C.
Here is the table of ECX, CFlag, ZFlag and SFlag for 3 cases:
case ECX CFlag ZFlag SFlag
1 X 1 1 0
2 X 1 0 0
3 16 0 1 0
4 16 0 0 0
We exit from the loop for cases 1 and 3 with jz which branches
when ZFlag is 1. If CFlag == 1, ECX has the offset X for case 1. */
.section .text.sse4.2,"ax",@progbits
.align 16
.type __strrchr_sse42, @function
.globl __strrchr_sse42
.hidden __strrchr_sse42
__strrchr_sse42:
cfi_startproc
CALL_MCOUNT
testb %sil, %sil
je __strend_sse4
xor %eax,%eax /* RAX has the last occurrence of s. */
movd %esi, %xmm1
punpcklbw %xmm1, %xmm1
movl %edi, %esi
punpcklbw %xmm1, %xmm1
andl $15, %esi
pshufd $0, %xmm1, %xmm1
movq %rdi, %r8
je L(loop)
/* Handle unaligned string using psrldq. */
leaq L(psrldq_table)(%rip), %rdx
andq $-16, %r8
movslq (%rdx,%rsi,4),%r9
movdqa (%r8), %xmm0
addq %rdx, %r9
jmp *%r9
/* Handle unaligned string with offset 1 using psrldq. */
.p2align 4
L(psrldq_1):
psrldq $1, %xmm0
.p2align 4
L(unaligned_pcmpistri):
pcmpistri $0x4a, %xmm1, %xmm0
jnc L(unaligned_no_byte)
leaq (%rdi,%rcx), %rax
L(unaligned_no_byte):
/* Find the length of the unaligned string. */
pcmpistri $0x3a, %xmm0, %xmm0
movl $16, %edx
subl %esi, %edx
cmpl %ecx, %edx
/* Return RAX if the unaligned fragment to next 16B already
contain the NULL terminator. */
jg L(exit)
addq $16, %r8
/* Loop start on aligned string. */
.p2align 4
L(loop):
pcmpistri $0x4a, (%r8), %xmm1
jbe L(match_or_eos)
addq $16, %r8
jmp L(loop)
.p2align 4
L(match_or_eos):
je L(had_eos)
L(match_no_eos):
leaq (%r8,%rcx), %rax
addq $16, %r8
jmp L(loop)
.p2align 4
L(had_eos):
jnc L(exit)
leaq (%r8,%rcx), %rax
.p2align 4
L(exit):
ret
/* Handle unaligned string with offset 15 using psrldq. */
.p2align 4
L(psrldq_15):
psrldq $15, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 14 using psrldq. */
.p2align 4
L(psrldq_14):
psrldq $14, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 13 using psrldq. */
.p2align 4
L(psrldq_13):
psrldq $13, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 12 using psrldq. */
.p2align 4
L(psrldq_12):
psrldq $12, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 11 using psrldq. */
.p2align 4
L(psrldq_11):
psrldq $11, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 10 using psrldq. */
.p2align 4
L(psrldq_10):
psrldq $10, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 9 using psrldq. */
.p2align 4
L(psrldq_9):
psrldq $9, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 8 using psrldq. */
.p2align 4
L(psrldq_8):
psrldq $8, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 7 using psrldq. */
.p2align 4
L(psrldq_7):
psrldq $7, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 6 using psrldq. */
.p2align 4
L(psrldq_6):
psrldq $6, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 5 using psrldq. */
.p2align 4
L(psrldq_5):
psrldq $5, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 4 using psrldq. */
.p2align 4
L(psrldq_4):
psrldq $4, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 3 using psrldq. */
.p2align 4
L(psrldq_3):
psrldq $3, %xmm0
jmp L(unaligned_pcmpistri)
/* Handle unaligned string with offset 2 using psrldq. */
.p2align 4
L(psrldq_2):
psrldq $2, %xmm0
jmp L(unaligned_pcmpistri)
cfi_endproc
.size __strrchr_sse42, .-__strrchr_sse42
.section .rodata.sse4.2,"a",@progbits
.p2align 4
L(psrldq_table):
.int L(loop) - L(psrldq_table)
.int L(psrldq_1) - L(psrldq_table)
.int L(psrldq_2) - L(psrldq_table)
.int L(psrldq_3) - L(psrldq_table)
.int L(psrldq_4) - L(psrldq_table)
.int L(psrldq_5) - L(psrldq_table)
.int L(psrldq_6) - L(psrldq_table)
.int L(psrldq_7) - L(psrldq_table)
.int L(psrldq_8) - L(psrldq_table)
.int L(psrldq_9) - L(psrldq_table)
.int L(psrldq_10) - L(psrldq_table)
.int L(psrldq_11) - L(psrldq_table)
.int L(psrldq_12) - L(psrldq_table)
.int L(psrldq_13) - L(psrldq_table)
.int L(psrldq_14) - L(psrldq_table)
.int L(psrldq_15) - L(psrldq_table)
# undef ENTRY
# define ENTRY(name) \
.type __strrchr_sse2, @function; \
.align 16; \
.globl __strrchr_sse2; \
.hidden __strrchr_sse2; \
__strrchr_sse2: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
cfi_endproc; .size __strrchr_sse2, .-__strrchr_sse2
# undef libc_hidden_builtin_def
/* It doesn't make sense to send libc-internal strrchr calls through a PLT.
The speedup we get from using SSE4.2 instruction is likely eaten away
by the indirect call in the PLT. */
# define libc_hidden_builtin_def(name) \
.globl __GI_strrchr; __GI_strrchr = __strrchr_sse2
#endif
#include "../strrchr.S"

247
sysdeps/x86_64/strrchr.S
View File

@ -1,6 +1,5 @@
/* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR.
For AMD x86-64.
Copyright (C) 2009-2013 Free Software Foundation, Inc.
Copyright (C) 2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -17,63 +16,217 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
# ifndef ALIGN
# define ALIGN(n) .p2align n
# endif
.text
ENTRY (strrchr)
movd %esi, %xmm1
movq %rdi, %rcx
punpcklbw %xmm1, %xmm1
andq $~15, %rdi
pxor %xmm2, %xmm2
punpcklbw %xmm1, %xmm1
orl $0xffffffff, %esi
movdqa (%rdi), %xmm0
movq %rdi, %rax
andl $4095, %eax
punpcklbw %xmm1, %xmm1
cmpq $4032, %rax
punpcklwd %xmm1, %xmm1
pshufd $0, %xmm1, %xmm1
subq %rdi, %rcx
ja L(cross_page)
movdqu (%rdi), %xmm0
pxor %xmm2, %xmm2
movdqa %xmm0, %xmm3
leaq 16(%rdi), %rdi
pcmpeqb %xmm1, %xmm0
pcmpeqb %xmm2, %xmm3
shl %cl, %esi
pmovmskb %xmm0, %edx
pmovmskb %xmm3, %ecx
andl %esi, %edx
andl %esi, %ecx
pmovmskb %xmm0, %ecx
pmovmskb %xmm3, %edx
testq %rdx, %rdx
je L(next_48_bytes)
leaq -1(%rdx), %rax
xorq %rdx, %rax
andq %rcx, %rax
je L(exit)
bsrq %rax, %rax
addq %rdi, %rax
ret
ALIGN(4)
L(next_48_bytes):
movdqu 16(%rdi), %xmm4
movdqa %xmm4, %xmm5
movdqu 32(%rdi), %xmm3
pcmpeqb %xmm1, %xmm4
pcmpeqb %xmm2, %xmm5
movdqu 48(%rdi), %xmm0
pmovmskb %xmm5, %edx
movdqa %xmm3, %xmm5
pcmpeqb %xmm1, %xmm3
pcmpeqb %xmm2, %xmm5
pcmpeqb %xmm0, %xmm2
salq $16, %rdx
pmovmskb %xmm3, %r8d
pmovmskb %xmm5, %eax
pmovmskb %xmm2, %esi
salq $32, %r8
salq $32, %rax
pcmpeqb %xmm1, %xmm0
orq %rdx, %rax
movq %rsi, %rdx
pmovmskb %xmm4, %esi
salq $48, %rdx
salq $16, %rsi
orq %r8, %rsi
orq %rcx, %rsi
pmovmskb %xmm0, %ecx
salq $48, %rcx
orq %rcx, %rsi
orq %rdx, %rax
je L(loop_header2)
leaq -1(%rax), %rcx
xorq %rax, %rcx
andq %rcx, %rsi
je L(exit)
bsrq %rsi, %rsi
leaq (%rdi,%rsi), %rax
ret
ALIGN(4)
L(loop_header2):
testq %rsi, %rsi
movq %rdi, %rcx
je L(no_c_found)
L(loop_header):
addq $64, %rdi
pxor %xmm7, %xmm7
andq $-64, %rdi
jmp L(loop_entry)
ALIGN(4)
L(loop64):
testq %rdx, %rdx
cmovne %rdx, %rsi
cmovne %rdi, %rcx
addq $64, %rdi
L(loop_entry):
movdqa 32(%rdi), %xmm3
pxor %xmm6, %xmm6
movdqa 48(%rdi), %xmm2
movdqa %xmm3, %xmm0
movdqa 16(%rdi), %xmm4
pminub %xmm2, %xmm0
movdqa (%rdi), %xmm5
pminub %xmm4, %xmm0
pminub %xmm5, %xmm0
pcmpeqb %xmm7, %xmm0
pmovmskb %xmm0, %eax
movdqa %xmm5, %xmm0
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm0, %r9d
movdqa %xmm4, %xmm0
pcmpeqb %xmm1, %xmm0
pmovmskb %xmm0, %edx
movdqa %xmm3, %xmm0
pcmpeqb %xmm1, %xmm0
salq $16, %rdx
pmovmskb %xmm0, %r10d
movdqa %xmm2, %xmm0
pcmpeqb %xmm1, %xmm0
salq $32, %r10
orq %r10, %rdx
pmovmskb %xmm0, %r8d
orq %r9, %rdx
salq $48, %r8
orq %r8, %rdx
testl %eax, %eax
je L(loop64)
pcmpeqb %xmm6, %xmm4
pcmpeqb %xmm6, %xmm3
pcmpeqb %xmm6, %xmm5
pmovmskb %xmm4, %eax
pmovmskb %xmm3, %r10d
pcmpeqb %xmm6, %xmm2
pmovmskb %xmm5, %r9d
salq $32, %r10
salq $16, %rax
pmovmskb %xmm2, %r8d
orq %r10, %rax
orq %r9, %rax
salq $48, %r8
orq %r8, %rax
leaq -1(%rax), %r8
xorq %rax, %r8
andq %r8, %rdx
cmovne %rdi, %rcx
cmovne %rdx, %rsi
bsrq %rsi, %rsi
leaq (%rcx,%rsi), %rax
ret
ALIGN(4)
L(no_c_found):
movl $1, %esi
xorl %ecx, %ecx
jmp L(loop_header)
ALIGN(4)
L(exit):
xorl %eax, %eax
movl %edx, %esi
orl %ecx, %esi
jnz 1f
ret
2: movdqa (%rdi), %xmm0
leaq 16(%rdi), %rdi
movdqa %xmm0, %xmm3
pcmpeqb %xmm1, %xmm0
pcmpeqb %xmm2, %xmm3
pmovmskb %xmm0, %edx
pmovmskb %xmm3, %ecx
movl %edx, %esi
orl %ecx, %esi
jz 2b
1: bsfl %ecx, %r9d
movl $0xffffffff, %r8d
movl $31, %ecx
jnz 5f
bsrl %edx, %edx
jz 2b
leaq -16(%rdi,%rdx), %rax
jmp 2b
5: subl %r9d, %ecx
shrl %cl, %r8d
andl %r8d, %edx
bsrl %edx, %edx
jz 4f
leaq -16(%rdi,%rdx), %rax
4: ret
ALIGN(4)
L(cross_page):
movq %rdi, %rax
pxor %xmm0, %xmm0
andq $-64, %rax
movdqu (%rax), %xmm5
movdqa %xmm5, %xmm6
movdqu 16(%rax), %xmm4
pcmpeqb %xmm1, %xmm5
pcmpeqb %xmm0, %xmm6
movdqu 32(%rax), %xmm3
pmovmskb %xmm6, %esi
movdqa %xmm4, %xmm6
movdqu 48(%rax), %xmm2
pcmpeqb %xmm1, %xmm4
pcmpeqb %xmm0, %xmm6
pmovmskb %xmm6, %edx
movdqa %xmm3, %xmm6
pcmpeqb %xmm1, %xmm3
pcmpeqb %xmm0, %xmm6
pcmpeqb %xmm2, %xmm0
salq $16, %rdx
pmovmskb %xmm3, %r9d
pmovmskb %xmm6, %r8d
pmovmskb %xmm0, %ecx
salq $32, %r9
salq $32, %r8
pcmpeqb %xmm1, %xmm2
orq %r8, %rdx
salq $48, %rcx
pmovmskb %xmm5, %r8d
orq %rsi, %rdx
pmovmskb %xmm4, %esi
orq %rcx, %rdx
pmovmskb %xmm2, %ecx
salq $16, %rsi
salq $48, %rcx
orq %r9, %rsi
orq %r8, %rsi
orq %rcx, %rsi
movl %edi, %ecx
subl %eax, %ecx
shrq %cl, %rdx
shrq %cl, %rsi
testq %rdx, %rdx
je L(loop_header2)
leaq -1(%rdx), %rax
xorq %rdx, %rax
andq %rax, %rsi
je L(exit)
bsrq %rsi, %rax
addq %rdi, %rax
ret
END (strrchr)
weak_alias (strrchr, rindex)