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Add SSE4.2 support for strcspn, strpbrk, and strspn on x86-64.

This commit is contained in:
H.J. Lu 2009-07-03 02:48:56 -07:00 committed by Ulrich Drepper
parent 241e680320
commit 06e51c8f3d
14 changed files with 875 additions and 7 deletions
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16
ChangeLog
View File

@ -1,3 +1,19 @@
2009-07-02 H.J. Lu <hongjiu.lu@intel.com>
* config.h.in (HAVE_SSE4_SUPPORT): New macro.
* config.make.in (config-cflags-sse4): New variable.
* configure.in: Substitute libc_cv_cc_sse4.
* sysdeps/i386/configure.in: Set libc_cv_cc_sse4 and
HAVE_SSE4_SUPPORT.
* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
strcspn-c, strpbrk-c, strspn-c for string if gcc supports SSE4.
* sysdeps/x86_64/multiarch/strcspn-c.c: New file.
* sysdeps/x86_64/multiarch/strcspn.S: New file.
* sysdeps/x86_64/multiarch/strpbrk-c.c: New file.
* sysdeps/x86_64/multiarch/strpbrk.S: New file.
* sysdeps/x86_64/multiarch/strspn-c.c: New file.
* sysdeps/x86_64/multiarch/strspn.S: New file.
2009-06-30 H.J. Lu <hongjiu.lu@intel.com>
* elf/Makefile (distribute): Remove tst-audit.sh. Add

3
config.h.in
View File

@ -129,6 +129,9 @@
/* Define if binutils support TLS handling. */
#undef HAVE_TLS_SUPPORT
/* Define if gcc supports SSE4. */
#undef HAVE_SSE4_SUPPORT
/* Define if the compiler's exception support is based on libunwind. */
#undef HAVE_CC_WITH_LIBUNWIND

2
config.make.in
View File

@ -34,6 +34,8 @@ config-sysdirs = @sysnames@
cflags-cpu = @libc_cv_cc_submachine@
asflags-cpu = @libc_cv_cc_submachine@
config-cflags-sse4 = @libc_cv_cc_sse4@
defines = @DEFINES@
sysincludes = @SYSINCLUDES@
c++-sysincludes = @CXX_SYSINCLUDES@

2
configure vendored
View File

@ -657,6 +657,7 @@ xcoff
elf
ldd_rewrite_script
use_ldconfig
libc_cv_cc_sse4
libc_cv_cpp_asm_debuginfo
libc_cv_forced_unwind
libc_cv_rootsbindir
@ -8744,6 +8745,7 @@ fi
if test $elf = yes; then
cat >>confdefs.h <<\_ACEOF
#define HAVE_ELF 1

1
configure.in
View File

@ -2259,6 +2259,7 @@ AC_SUBST(libc_cv_forced_unwind)
dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
AC_SUBST(libc_cv_cpp_asm_debuginfo)
AC_SUBST(libc_cv_cc_sse4)
AC_SUBST(use_ldconfig)
AC_SUBST(ldd_rewrite_script)

71
sysdeps/i386/configure vendored
View File

@ -1,10 +1,42 @@
as_nl='
'
export as_nl
# Printing a long string crashes Solaris 7 /usr/bin/printf.
as_echo='\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'
as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo
as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo$as_echo
if (test "X`printf %s $as_echo`" = "X$as_echo") 2>/dev/null; then
as_echo='printf %s\n'
as_echo_n='printf %s'
else
if test "X`(/usr/ucb/echo -n -n $as_echo) 2>/dev/null`" = "X-n $as_echo"; then
as_echo_body='eval /usr/ucb/echo -n "$1$as_nl"'
as_echo_n='/usr/ucb/echo -n'
else
as_echo_body='eval expr "X$1" : "X\\(.*\\)"'
as_echo_n_body='eval
arg=$1;
case $arg in
*"$as_nl"*)
expr "X$arg" : "X\\(.*\\)$as_nl";
arg=`expr "X$arg" : ".*$as_nl\\(.*\\)"`;;
esac;
expr "X$arg" : "X\\(.*\\)" | tr -d "$as_nl"
'
export as_echo_n_body
as_echo_n='sh -c $as_echo_n_body as_echo'
fi
export as_echo_body
as_echo='sh -c $as_echo_body as_echo'
fi
# This file is generated from configure.in by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/i386.
echo "$as_me:$LINENO: checking if -g produces usable source locations for assembler-with-cpp" >&5
echo $ECHO_N "checking if -g produces usable source locations for assembler-with-cpp... $ECHO_C" >&6
{ $as_echo "$as_me:$LINENO: checking if -g produces usable source locations for assembler-with-cpp" >&5
$as_echo_n "checking if -g produces usable source locations for assembler-with-cpp... " >&6; }
if test "${libc_cv_cpp_asm_debuginfo+set}" = set; then
echo $ECHO_N "(cached) $ECHO_C" >&6
$as_echo_n "(cached) " >&6
else
cat > conftest.S <<EOF
#include "confdefs.h"
@ -27,7 +59,7 @@ if { ac_try='${CC-cc} $CPPFLAGS $ASFLAGS -g -c conftest.S 1>&5'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } && {
ac_pattern='conftest\.S'
{ ac_try='readelf --debug-dump=line conftest.o |
@ -35,7 +67,7 @@ if { ac_try='${CC-cc} $CPPFLAGS $ASFLAGS -g -c conftest.S 1>&5'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }
}; then
libc_cv_cpp_asm_debuginfo=yes
@ -44,11 +76,36 @@ else
fi
rm -f conftest*
fi
echo "$as_me:$LINENO: result: $libc_cv_cpp_asm_debuginfo" >&5
echo "${ECHO_T}$libc_cv_cpp_asm_debuginfo" >&6
{ $as_echo "$as_me:$LINENO: result: $libc_cv_cpp_asm_debuginfo" >&5
$as_echo "$libc_cv_cpp_asm_debuginfo" >&6; }
if test $libc_cv_cpp_asm_debuginfo = yes; then
cat >>confdefs.h <<\_ACEOF
#define HAVE_CPP_ASM_DEBUGINFO 1
_ACEOF
fi
{ $as_echo "$as_me:$LINENO: checking for SSE4 support" >&5
$as_echo_n "checking for SSE4 support... " >&6; }
if test "${libc_cv_cc_sse4+set}" = set; then
$as_echo_n "(cached) " >&6
else
if { ac_try='${CC-cc} -msse4 -xc /dev/null -S -o /dev/null'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
libc_cv_cc_sse4=yes
else
libc_cv_cc_sse4=no
fi
fi
{ $as_echo "$as_me:$LINENO: result: $libc_cv_cc_sse4" >&5
$as_echo "$libc_cv_cc_sse4" >&6; }
if test $libc_cv_cc_sse4 = yes; then
cat >>confdefs.h <<\_ACEOF
#define HAVE_SSE4_SUPPORT 1
_ACEOF
fi

11
sysdeps/i386/configure.in
View File

@ -33,3 +33,14 @@ rm -f conftest*])AC_SUBST(libc_cv_cpp_asm_debuginfo)
if test $libc_cv_cpp_asm_debuginfo = yes; then
AC_DEFINE(HAVE_CPP_ASM_DEBUGINFO)
fi
dnl Check if -msse4 works.
AC_CACHE_CHECK(for SSE4 support, libc_cv_cc_sse4, [dnl
if AC_TRY_COMMAND([${CC-cc} -msse4 -xc /dev/null -S -o /dev/null]); then
libc_cv_cc_sse4=yes
else
libc_cv_cc_sse4=no
fi])
if test $libc_cv_cc_sse4 = yes; then
AC_DEFINE(HAVE_SSE4_SUPPORT)
fi

6
sysdeps/x86_64/multiarch/Makefile
View File

@ -5,4 +5,10 @@ endif
ifeq ($(subdir),string)
sysdep_routines += stpncpy-c strncpy-c strncmp-c
ifeq (yes,$(config-cflags-sse4))
sysdep_routines += strcspn-c strpbrk-c strspn-c
CFLAGS-strcspn-c.c += -msse4
CFLAGS-strpbrk-c.c += -msse4
CFLAGS-strspn-c.c += -msse4
endif
endif

331
sysdeps/x86_64/multiarch/strcspn-c.c Normal file
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@ -0,0 +1,331 @@
/* strcspn with SSE4.2 intrinsics
Copyright (C) 2009 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. */
#include <nmmintrin.h>
#include <string.h>
/* We use 0x2:
_SIDD_SBYTE_OPS
| _SIDD_CMP_EQUAL_ANY
| _SIDD_POSITIVE_POLARITY
| _SIDD_LEAST_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
A A A A A A A A A A A A A A A A
to find out if the first 16byte data element has any byte A and
the offset of the first byte. There are 3 cases:
1. The first 16byte data element has the byte A at the offset X.
2. The first 16byte data element has EOS and doesn't have the byte A.
3. The first 16byte data element is valid and doesn't have the byte A.
Here is the table of ECX, CFlag, ZFlag and SFlag for 2 cases:
1 X 1 0/1 0
2 16 0 1 0
3 16 0 0 0
We exit from the loop for cases 1 and 2 with jbe which branches
when either CFlag or ZFlag is 1. If CFlag == 1, ECX has the offset
X for case 1. */
#ifndef STRCSPN_SSE2
#define STRCSPN_SSE2 __strcspn_sse2
#define STRCSPN_SSE42 __strcspn_sse42
#endif
extern
#ifdef USE_AS_STRPBRK
char *
#else
size_t
#endif
STRCSPN_SSE2 (const char *, const char *);
#ifdef USE_AS_STRPBRK
char *
#else
size_t
#endif
__attribute__ ((section (".text.sse4.2")))
STRCSPN_SSE42 (const char *s, const char *a)
{
int offset;
const char *aligned;
__m128i mask, mask0, mask1;
__m128i value;
int index, length;
int cflag, zflag;
if (*a == 0)
#ifdef USE_AS_STRPBRK
return NULL;
#else
return strlen (s);
#endif
offset = (int) ((size_t) a & 15);
if (offset != 0)
{
/* Load masks. */
aligned = (const char *) ((size_t) a & 0xfffffffffffffff0L);
mask0 = _mm_load_si128 ((__m128i *) aligned);
switch (offset)
{
case 1:
mask = _mm_srli_si128 (mask0, 1);
break;
case 2:
mask = _mm_srli_si128 (mask0, 2);
break;
case 3:
mask = _mm_srli_si128 (mask0, 3);
break;
case 4:
mask = _mm_srli_si128 (mask0, 4);
break;
case 5:
mask = _mm_srli_si128 (mask0, 5);
break;
case 6:
mask = _mm_srli_si128 (mask0, 6);
break;
case 7:
mask = _mm_srli_si128 (mask0, 7);
break;
case 8:
mask = _mm_srli_si128 (mask0, 8);
break;
case 9:
mask = _mm_srli_si128 (mask0, 9);
break;
case 10:
mask = _mm_srli_si128 (mask0, 10);
break;
case 11:
mask = _mm_srli_si128 (mask0, 11);
break;
case 12:
mask = _mm_srli_si128 (mask0, 12);
break;
case 13:
mask = _mm_srli_si128 (mask0, 13);
break;
case 14:
mask = _mm_srli_si128 (mask0, 14);
break;
case 15:
mask = _mm_srli_si128 (mask0, 15);
break;
}
/* Find where the NULL terminator is. */
length = _mm_cmpistri (mask, mask, 0x3a);
if (length == 16 - offset)
{
/* There is no NULL terminator. */
mask1 = _mm_load_si128 ((__m128i *) (aligned + 16));
index = _mm_cmpistri (mask1, mask1, 0x3a);
length += index;
/* Don't use SSE4.2 if the length of A > 16. */
if (length > 16)
return STRCSPN_SSE2 (s, a);
if (index != 0)
{
/* Combine mask0 and mask1. */
switch (offset)
{
case 1:
mask = _mm_alignr_epi8 (mask1, mask0, 1);
break;
case 2:
mask = _mm_alignr_epi8 (mask1, mask0, 2);
break;
case 3:
mask = _mm_alignr_epi8 (mask1, mask0, 3);
break;
case 4:
mask = _mm_alignr_epi8 (mask1, mask0, 4);
break;
case 5:
mask = _mm_alignr_epi8 (mask1, mask0, 5);
break;
case 6:
mask = _mm_alignr_epi8 (mask1, mask0, 6);
break;
case 7:
mask = _mm_alignr_epi8 (mask1, mask0, 7);
break;
case 8:
mask = _mm_alignr_epi8 (mask1, mask0, 8);
break;
case 9:
mask = _mm_alignr_epi8 (mask1, mask0, 9);
break;
case 10:
mask = _mm_alignr_epi8 (mask1, mask0, 10);
break;
case 11:
mask = _mm_alignr_epi8 (mask1, mask0, 11);
break;
case 12:
mask = _mm_alignr_epi8 (mask1, mask0, 12);
break;
case 13:
mask = _mm_alignr_epi8 (mask1, mask0, 13);
break;
case 14:
mask = _mm_alignr_epi8 (mask1, mask0, 14);
break;
case 15:
mask = _mm_alignr_epi8 (mask1, mask0, 15);
break;
}
}
}
}
else
{
/* A is aligned. */
mask = _mm_load_si128 ((__m128i *) a);
/* Find where the NULL terminator is. */
length = _mm_cmpistri (mask, mask, 0x3a);
if (length == 16)
{
/* There is no NULL terminator. Don't use SSE4.2 if the length
of A > 16. */
if (a[16] != 0)
return STRCSPN_SSE2 (s, a);
}
}
offset = (int) ((size_t) s & 15);
if (offset != 0)
{
/* Check partial string. */
aligned = (const char *) ((size_t) s & 0xfffffffffffffff0L);
value = _mm_load_si128 ((__m128i *) aligned);
switch (offset)
{
case 1:
value = _mm_srli_si128 (value, 1);
break;
case 2:
value = _mm_srli_si128 (value, 2);
break;
case 3:
value = _mm_srli_si128 (value, 3);
break;
case 4:
value = _mm_srli_si128 (value, 4);
break;
case 5:
value = _mm_srli_si128 (value, 5);
break;
case 6:
value = _mm_srli_si128 (value, 6);
break;
case 7:
value = _mm_srli_si128 (value, 7);
break;
case 8:
value = _mm_srli_si128 (value, 8);
break;
case 9:
value = _mm_srli_si128 (value, 9);
break;
case 10:
value = _mm_srli_si128 (value, 10);
break;
case 11:
value = _mm_srli_si128 (value, 11);
break;
case 12:
value = _mm_srli_si128 (value, 12);
break;
case 13:
value = _mm_srli_si128 (value, 13);
break;
case 14:
value = _mm_srli_si128 (value, 14);
break;
case 15:
value = _mm_srli_si128 (value, 15);
break;
}
length = _mm_cmpistri (mask, value, 0x2);
/* No need to check ZFlag since ZFlag is always 1. */
cflag = _mm_cmpistrc (mask, value, 0x2);
if (cflag)
#ifdef USE_AS_STRPBRK
return (char *) (s + length);
#else
return length;
#endif
/* Find where the NULL terminator is. */
index = _mm_cmpistri (value, value, 0x3a);
if (index < 16 - offset)
#ifdef USE_AS_STRPBRK
return NULL;
#else
return index;
#endif
aligned += 16;
}
else
aligned = s;
loop:
value = _mm_load_si128 ((__m128i *) aligned);
index = _mm_cmpistri (mask, value, 0x2);
cflag = _mm_cmpistrc (mask, value, 0x2);
zflag = _mm_cmpistrz (mask, value, 0x2);
if (cflag)
#ifdef USE_AS_STRPBRK
return (char *) (aligned + index);
#else
return (size_t) (aligned + index - s);
#endif
if (zflag)
#ifdef USE_AS_STRPBRK
return NULL;
#else
{
/* Find where the NULL terminator is. */
index = _mm_cmpistri (value, value, 0x3a);
return (size_t) (aligned + index - s);
}
#endif
aligned += 16;
goto loop;
}

82
sysdeps/x86_64/multiarch/strcspn.S Normal file
View File

@ -0,0 +1,82 @@
/* Multiple versions of strcspn
Copyright (C) 2009 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. */
#include <config.h>
#ifdef HAVE_SSE4_SUPPORT
#include <sysdep.h>
#include <ifunc-defines.h>
#ifdef USE_AS_STRPBRK
#define STRCSPN_SSE42 __strpbrk_sse42
#define STRCSPN_SSE2 __strpbrk_sse2
#define __GI_STRCSPN __GI_strpbrk
#else
#ifndef STRCSPN
#define STRCSPN strcspn
#define STRCSPN_SSE42 __strcspn_sse42
#define STRCSPN_SSE2 __strcspn_sse2
#define __GI_STRCSPN __GI_strcspn
#endif
#endif
/* Define multiple versions only for the definition in libc. Don't
define multiple versions for strpbrk in static library since we
need strpbrk before the initialization happened. */
#if (defined SHARED || !defined USE_AS_STRPBRK) && !defined NOT_IN_libc
.text
ENTRY(STRCSPN)
.type STRCSPN, @gnu_indirect_function
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
jne 1f
call __init_cpu_features
1: leaq STRCSPN_SSE2(%rip), %rax
testl $(1<<20), __cpu_features+CPUID_OFFSET+COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET(%rip)
jz 2f
leaq STRCSPN_SSE42(%rip), %rax
2: ret
END(STRCSPN)
# undef ENTRY
# define ENTRY(name) \
.type STRCSPN_SSE2, @function; \
.globl STRCSPN_SSE2; \
.align 16; \
STRCSPN_SSE2: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
cfi_endproc; .size STRCSPN_SSE2, .-STRCSPN_SSE2
# undef libc_hidden_builtin_def
/* It doesn't make sense to send libc-internal strcspn 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_STRCSPN; __GI_STRCSPN = STRCSPN_SSE2
#endif
#endif /* HAVE_SSE4_SUPPORT */
#ifdef USE_AS_STRPBRK
#include "../strpbrk.S"
#else
#include "../strcspn.S"
#endif

4
sysdeps/x86_64/multiarch/strpbrk-c.c Normal file
View File

@ -0,0 +1,4 @@
#define USE_AS_STRPBRK
#define STRCSPN_SSE2 __strpbrk_sse2
#define STRCSPN_SSE42 __strpbrk_sse42
#include "strcspn-c.c"

3
sysdeps/x86_64/multiarch/strpbrk.S Normal file
View File

@ -0,0 +1,3 @@
#define STRCSPN strpbrk
#define USE_AS_STRPBRK
#include "strcspn.S"

287
sysdeps/x86_64/multiarch/strspn-c.c Normal file
View File

@ -0,0 +1,287 @@
/* strspn with SSE4.2 intrinsics
Copyright (C) 2009 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. */
#include <nmmintrin.h>
#include <string.h>
/* We use 0x12:
_SIDD_SBYTE_OPS
| _SIDD_CMP_EQUAL_ANY
| _SIDD_NEGATIVE_POLARITY
| _SIDD_LEAST_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
A A A A A A A A A A A A A A A A
to find out if the first 16byte data element has any non-A byte and
the offset of the first byte. There are 2 cases:
1. The first 16byte data element has the non-A byte, including
EOS, at the offset X.
2. The first 16byte data element is valid and doesn't have the non-A
byte.
Here is the table of ECX, CFlag, ZFlag and SFlag for 2 cases:
case ECX CFlag ZFlag SFlag
1 X 1 0/1 0
2 16 0 0 0
We exit from the loop for case 1. */
extern size_t __strspn_sse2 (const char *, const char *);
size_t
__attribute__ ((section (".text.sse4.2")))
__strspn_sse42 (const char *s, const char *a)
{
int offset;
const char *aligned;
__m128i mask, mask0, mask1;
__m128i value;
int index, length;
int cflag;
if (*a == 0)
return 0;
offset = (int) ((size_t) a & 15);
if (offset != 0)
{
/* Load masks. */
aligned = (const char *) ((size_t) a & 0xfffffffffffffff0L);
mask0 = _mm_load_si128 ((__m128i *) aligned);
switch (offset)
{
case 1:
mask = _mm_srli_si128 (mask0, 1);
break;
case 2:
mask = _mm_srli_si128 (mask0, 2);
break;
case 3:
mask = _mm_srli_si128 (mask0, 3);
break;
case 4:
mask = _mm_srli_si128 (mask0, 4);
break;
case 5:
mask = _mm_srli_si128 (mask0, 5);
break;
case 6:
mask = _mm_srli_si128 (mask0, 6);
break;
case 7:
mask = _mm_srli_si128 (mask0, 7);
break;
case 8:
mask = _mm_srli_si128 (mask0, 8);
break;
case 9:
mask = _mm_srli_si128 (mask0, 9);
break;
case 10:
mask = _mm_srli_si128 (mask0, 10);
break;
case 11:
mask = _mm_srli_si128 (mask0, 11);
break;
case 12:
mask = _mm_srli_si128 (mask0, 12);
break;
case 13:
mask = _mm_srli_si128 (mask0, 13);
break;
case 14:
mask = _mm_srli_si128 (mask0, 14);
break;
case 15:
mask = _mm_srli_si128 (mask0, 15);
break;
}
/* Find where the NULL terminator is. */
length = _mm_cmpistri (mask, mask, 0x3a);
if (length == 16 - offset)
{
/* There is no NULL terminator. */
mask1 = _mm_load_si128 ((__m128i *) (aligned + 16));
index = _mm_cmpistri (mask1, mask1, 0x3a);
length += index;
/* Don't use SSE4.2 if the length of A > 16. */
if (length > 16)
return __strspn_sse2 (s, a);
if (index != 0)
{
/* Combine mask0 and mask1. */
switch (offset)
{
case 1:
mask = _mm_alignr_epi8 (mask1, mask0, 1);
break;
case 2:
mask = _mm_alignr_epi8 (mask1, mask0, 2);
break;
case 3:
mask = _mm_alignr_epi8 (mask1, mask0, 3);
break;
case 4:
mask = _mm_alignr_epi8 (mask1, mask0, 4);
break;
case 5:
mask = _mm_alignr_epi8 (mask1, mask0, 5);
break;
case 6:
mask = _mm_alignr_epi8 (mask1, mask0, 6);
break;
case 7:
mask = _mm_alignr_epi8 (mask1, mask0, 7);
break;
case 8:
mask = _mm_alignr_epi8 (mask1, mask0, 8);
break;
case 9:
mask = _mm_alignr_epi8 (mask1, mask0, 9);
break;
case 10:
mask = _mm_alignr_epi8 (mask1, mask0, 10);
break;
case 11:
mask = _mm_alignr_epi8 (mask1, mask0, 11);
break;
case 12:
mask = _mm_alignr_epi8 (mask1, mask0, 12);
break;
case 13:
mask = _mm_alignr_epi8 (mask1, mask0, 13);
break;
case 14:
mask = _mm_alignr_epi8 (mask1, mask0, 14);
break;
case 15:
mask = _mm_alignr_epi8 (mask1, mask0, 15);
break;
}
}
}
}
else
{
/* A is aligned. */
mask = _mm_load_si128 ((__m128i *) a);
/* Find where the NULL terminator is. */
length = _mm_cmpistri (mask, mask, 0x3a);
if (length == 16)
{
/* There is no NULL terminator. Don't use SSE4.2 if the length
of A > 16. */
if (a[16] != 0)
return __strspn_sse2 (s, a);
}
}
offset = (int) ((size_t) s & 15);
if (offset != 0)
{
/* Check partial string. */
aligned = (const char *) ((size_t) s & 0xfffffffffffffff0L);
value = _mm_load_si128 ((__m128i *) aligned);
switch (offset)
{
case 1:
value = _mm_srli_si128 (value, 1);
break;
case 2:
value = _mm_srli_si128 (value, 2);
break;
case 3:
value = _mm_srli_si128 (value, 3);
break;
case 4:
value = _mm_srli_si128 (value, 4);
break;
case 5:
value = _mm_srli_si128 (value, 5);
break;
case 6:
value = _mm_srli_si128 (value, 6);
break;
case 7:
value = _mm_srli_si128 (value, 7);
break;
case 8:
value = _mm_srli_si128 (value, 8);
break;
case 9:
value = _mm_srli_si128 (value, 9);
break;
case 10:
value = _mm_srli_si128 (value, 10);
break;
case 11:
value = _mm_srli_si128 (value, 11);
break;
case 12:
value = _mm_srli_si128 (value, 12);
break;
case 13:
value = _mm_srli_si128 (value, 13);
break;
case 14:
value = _mm_srli_si128 (value, 14);
break;
case 15:
value = _mm_srli_si128 (value, 15);
break;
}
length = _mm_cmpistri (mask, value, 0x12);
/* No need to check CFlag since it is always 1. */
if (length < 16 - offset)
return length;
/* Find where the NULL terminator is. */
index = _mm_cmpistri (value, value, 0x3a);
if (index < 16 - offset)
return length;
aligned += 16;
}
else
aligned = s;
loop:
value = _mm_load_si128 ((__m128i *) aligned);
index = _mm_cmpistri (mask, value, 0x12);
cflag = _mm_cmpistrc (mask, value, 0x12);
if (cflag)
return (size_t) (aligned + index - s);
aligned += 16;
goto loop;
}

63
sysdeps/x86_64/multiarch/strspn.S Normal file
View File

@ -0,0 +1,63 @@
/* Multiple versions of strspn
Copyright (C) 2009 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. */
#include <config.h>
#ifdef HAVE_SSE4_SUPPORT
#include <sysdep.h>
#include <ifunc-defines.h>
/* Define multiple versions only for the definition in libc. */
#ifndef NOT_IN_libc
.text
ENTRY(strspn)
.type strspn, @gnu_indirect_function
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
jne 1f
call __init_cpu_features
1: leaq __strspn_sse2(%rip), %rax
testl $(1<<20), __cpu_features+CPUID_OFFSET+COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET(%rip)
jz 2f
leaq __strspn_sse42(%rip), %rax
2: ret
END(strspn)
# undef ENTRY
# define ENTRY(name) \
.type __strspn_sse2, @function; \
.globl __strspn_sse2; \
.align 16; \
__strspn_sse2: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
cfi_endproc; .size __strspn_sse2, .-__strspn_sse2
# undef libc_hidden_builtin_def
/* It doesn't make sense to send libc-internal strspn 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_strspn; __GI_strspn = __strspn_sse2
#endif
#endif /* HAVE_SSE4_SUPPORT */
#include "../strspn.S"