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S390: Optimize strcmp and wcscmp.

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This patch provides optimized versions of strcmp and wcscmp with the z13
vector instructions.

The architecture specific string.h had a typo, which leads to ommiting the
inline version in this file if __USE_STRING_INLINES is defined.
Tested this inline version by tweaking test-strcmp.c.

ChangeLog:

	* sysdeps/s390/multiarch/strcmp-vx.S: New File.
	* sysdeps/s390/multiarch/strcmp.c: Likewise.
	* sysdeps/s390/multiarch/wcscmp-c.c: Likewise.
	* sysdeps/s390/multiarch/wcscmp-vx.S: Likewise.
	* sysdeps/s390/multiarch/wcscmp.c: Likewise.
	* sysdeps/s390/s390-32/multiarch/strcmp.c: Likewise.
	* sysdeps/s390/s390-64/multiarch/strcmp.c: Likewise.
	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strcmp and
	wcscmp functions.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc test for strcmp, wcscmp.
	* string/strcmp.c (STRCMP): Define and use macro.
	* benchtests/bench-wcscmp.c: New File.
	* benchtests/Makefile (wcsmbs-bench): Add wcscmp.
	* sysdeps/s390/bits/string.h: Fix typo: _HAVE_STRING_ARCH_strcmp
	instead of _HAVE_STRING_ARCH_memchr.
This commit is contained in:
Stefan Liebler 2015-08-26 10:26:22 +02:00 committed by Andreas Krebbel
parent e1fe91180e
commit 63724a6db6
14 changed files with 430 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
ChangeLog
View File

@ -1,3 +1,22 @@
2015-08-26 Stefan Liebler <stli@linux.vnet.ibm.com>
* sysdeps/s390/multiarch/strcmp-vx.S: New File.
* sysdeps/s390/multiarch/strcmp.c: Likewise.
* sysdeps/s390/multiarch/wcscmp-c.c: Likewise.
* sysdeps/s390/multiarch/wcscmp-vx.S: Likewise.
* sysdeps/s390/multiarch/wcscmp.c: Likewise.
* sysdeps/s390/s390-32/multiarch/strcmp.c: Likewise.
* sysdeps/s390/s390-64/multiarch/strcmp.c: Likewise.
* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strcmp and
wcscmp functions.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Add ifunc test for strcmp, wcscmp.
* string/strcmp.c (STRCMP): Define and use macro.
* benchtests/bench-wcscmp.c: New File.
* benchtests/Makefile (wcsmbs-bench): Add wcscmp.
* sysdeps/s390/bits/string.h: Fix typo: _HAVE_STRING_ARCH_strcmp
instead of _HAVE_STRING_ARCH_memchr.
2015-08-26 Stefan Liebler <stli@linux.vnet.ibm.com>
* sysdeps/s390/multiarch/strncat-c.c: New File.

3
benchtests/Makefile
View File

@ -36,7 +36,8 @@ string-bench := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \
strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \
strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok \
strcoll
wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat
wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat \
wcscmp
string-bench-all := $(string-bench) ${wcsmbs-bench}
# We have to generate locales

20
benchtests/bench-wcscmp.c Normal file
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@ -0,0 +1,20 @@
/* Measure wcscmp functions.
Copyright (C) 2015 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/>. */
#define WIDE 1
#include "bench-strcmp.c"

6
string/strcmp.c
View File

@ -19,11 +19,15 @@
#undef strcmp
#ifndef STRCMP
# define STRCMP strcmp
#endif
/* Compare S1 and S2, returning less than, equal to or
greater than zero if S1 is lexicographically less than,
equal to or greater than S2. */
int
strcmp (const char *p1, const char *p2)
STRCMP (const char *p1, const char *p2)
{
const unsigned char *s1 = (const unsigned char *) p1;
const unsigned char *s2 = (const unsigned char *) p2;

4
sysdeps/s390/bits/string.h
View File

@ -226,8 +226,8 @@ memchr (const void *__str, int __c, size_t __n)
}
#endif
/* Search N bytes of S for C. */
#define _HAVE_STRING_ARCH_memchr 1
/* Compare S1 and S2. */
#define _HAVE_STRING_ARCH_strcmp 1
#ifndef _FORCE_INLINES
__STRING_INLINE int
strcmp (const char *__s1, const char *__s2)

6
sysdeps/s390/multiarch/Makefile
View File

@ -6,7 +6,8 @@ sysdep_routines += strlen strlen-vx strlen-c \
strncpy strncpy-vx \
stpncpy stpncpy-vx stpncpy-c \
strcat strcat-vx strcat-c \
strncat strncat-vx strncat-c
strncat strncat-vx strncat-c \
strcmp strcmp-vx
endif
ifeq ($(subdir),wcsmbs)
@ -17,5 +18,6 @@ sysdep_routines += wcslen wcslen-vx wcslen-c \
wcsncpy wcsncpy-vx wcsncpy-c \
wcpncpy wcpncpy-vx wcpncpy-c \
wcscat wcscat-vx wcscat-c \
wcsncat wcsncat-vx wcsncat-c
wcsncat wcsncat-vx wcsncat-c \
wcscmp wcscmp-vx wcscmp-c
endif

3
sysdeps/s390/multiarch/ifunc-impl-list.c
View File

@ -103,6 +103,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_VX_IMPL (strncat);
IFUNC_VX_IMPL (wcsncat);
IFUNC_VX_IMPL (strcmp);
IFUNC_VX_IMPL (wcscmp);
#endif /* HAVE_S390_VX_ASM_SUPPORT */
return i;

116
sysdeps/s390/multiarch/strcmp-vx.S Normal file
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@ -0,0 +1,116 @@
/* Vector optimized 32/64 bit S/390 version of strcmp.
Copyright (C) 2015 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/>. */
#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* int strcmp (const char *s1, const char *s2)
Compare two strings
Register usage:
-r1=loaded byte count s1
-r2=s1
-r3=s2
-r4=loaded byte coutn s2, tmp
-r5=current_len
-v16=part of s1
-v17=part of s2
-v18=index of unequal
*/
ENTRY(__strcmp_vx)
.machine "z13"
.machinemode "zarch_nohighgprs"
lghi %r5,0 /* current_len = 0. */
.Lloop:
vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */
vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */
lcbb %r1,0(%r5,%r2),6 /* Get loaded byte count of s1. */
jo .Llt16_1 /* Jump away if vr is not fully loaded. */
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2 /* Jump away if vr is not fully loaded. */
/* Both vrs are fully loaded. */
aghi %r5,16
vfenezbs %v18,%v16,%v17 /* Compare not equal with zero search. */
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezbs %v18,%v16,%v17
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezbs %v18,%v16,%v17
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezbs %v18,%v16,%v17
jno .Lfound
j .Lloop
.Llt16_1:
lcbb %r4,0(%r5,%r3),6 /* Get loaded byte count of s2. */
.Llt16_2:
clr %r1,%r4
locrh %r1,%r4 /* Get minimum of bytes loaded in s1/2. */
algfr %r5,%r1 /* Add smallest loaded bytes to current_len. */
vfenezbs %v18,%v16,%v17 /* Compare not equal with zero search. */
vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */
clrjl %r4,%r1,.Lfound /* Jump away if miscompare is within loaded
bytes. */
j .Lloop
.Lfound:
je .Lend_equal
lghi %r2,1
lghi %r1,-1
locgrl %r2,%r1
br %r14
.Lend_equal:
lghi %r2,0
br %r14
END(__strcmp_vx)
# define strcmp __strcmp_c
# undef libc_hidden_builtin_def
# define libc_hidden_builtin_def(name) strong_alias(__strcmp_c, __GI_strcmp)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
#include <strcmp.S>

26
sysdeps/s390/multiarch/strcmp.c Normal file
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@ -0,0 +1,26 @@
/* Multiple versions of strcmp.
Copyright (C) 2015 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/>. */
#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
# include <string.h>
# include <ifunc-resolve.h>
# undef strcmp
s390_vx_libc_ifunc2 (__strcmp, strcmp)
#endif

32
sysdeps/s390/multiarch/wcscmp-c.c Normal file
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@ -0,0 +1,32 @@
/* Default wcscmp implementation for S/390.
Copyright (C) 2015 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/>. */
#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
# define WCSCMP __wcscmp_c
# include <wchar.h>
extern __typeof (wcscmp) __wcscmp_c;
# undef weak_alias
# define weak_alias(name, alias)
# ifdef SHARED
# undef libc_hidden_def
# define libc_hidden_def(name) \
__hidden_ver1 (__wcscmp_c, __GI___wcscmp, __wcscmp_c);
# endif /* SHARED */
# include <wcsmbs/wcscmp.c>
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */

131
sysdeps/s390/multiarch/wcscmp-vx.S Normal file
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@ -0,0 +1,131 @@
/* Vector optimized 32/64 bit S/390 version of wcscmp.
Copyright (C) 2015 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/>. */
#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* int wcscmp (const wchar_t *s1, const wchar_t *s2)
Compare two strings
Register usage:
-r1=loaded byte count s1
-r2=s1
-r3=s2
-r4=loaded byte coutn s2, tmp
-r5=current_len
-v16=part of s1
-v17=part of s2
-v18=index of unequal
*/
ENTRY(__wcscmp_vx)
.machine "z13"
.machinemode "zarch_nohighgprs"
lghi %r5,0 /* current_len = 0. */
.Lloop:
vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */
vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */
lcbb %r1,0(%r5,%r2),6 /* Get loaded byte count of s1. */
jo .Llt16_1 /* Jump away if vr is not fully loaded. */
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2 /* Jump away if vr is not fully loaded. */
/* Both vrs are fully loaded. */
aghi %r5,16
vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
vlbb %v16,0(%r5,%r2),6
vlbb %v17,0(%r5,%r3),6
lcbb %r1,0(%r5,%r2),6
jo .Llt16_1
lcbb %r4,0(%r5,%r3),6
jo .Llt16_2
aghi %r5,16
vfenezfs %v18,%v16,%v17
jno .Lfound
j .Lloop
.Lcmp_one_char:
/* At least one of both strings is not 4-byte aligned
and there is no full character before next block-boundary.
Compare one character to get over the boundary and
proceed with normal loop! */
vlef %v16,0(%r5,%r2),0 /* Load one character. */
vlef %v17,0(%r5,%r3),0
lghi %r1,4 /* Loaded byte count is 4. */
j .Llt_cmp /* Proceed with comparision. */
.Llt16_1:
lcbb %r4,0(%r5,%r3),6 /* Get loaded byte count of s2. */
.Llt16_2:
clr %r1,%r4
locrh %r1,%r4 /* Get minimum of bytes loaded in s1/2. */
nill %r1,65532 /* Align bytes loaded to full characters. */
jz .Lcmp_one_char /* Jump away if no full char is available. */
.Llt_cmp:
algfr %r5,%r1 /* Add smallest loaded bytes to current_len. */
vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */
vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */
clrjl %r4,%r1,.Lfound /* Jump away if miscompare is within loaded
bytes. */
j .Lloop
.Lfound:
/* vfenezf found an unequal element or zero.
This instruction compares unsigned words, but wchar_t is signed.
Thus we have to compare the found element again. */
vlgvb %r4,%v18,7 /* Extract not equal byte-index, */
srl %r4,2 /* Convert it to character-index. */
vlgvf %r3,%v16,0(%r4) /* Load character-values. */
vlgvf %r4,%v17,0(%r4)
cr %r3,%r4
je .Lend_equal
lghi %r2,1
lghi %r1,-1
locgrl %r2,%r1
br %r14
.Lend_equal:
lghi %r2,0
br %r14
END(__wcscmp_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */

28
sysdeps/s390/multiarch/wcscmp.c Normal file
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@ -0,0 +1,28 @@
/* Multiple versions of wcscmp.
Copyright (C) 2015 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/>. */
#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
# include <wchar.h>
# include <ifunc-resolve.h>
s390_vx_libc_ifunc (__wcscmp)
weak_alias (__wcscmp, wcscmp)
#else
# include <wcsmbs/wcscmp.c>
#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */

21
sysdeps/s390/s390-32/multiarch/strcmp.c Normal file
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@ -0,0 +1,21 @@
/* Multiple versions of strcmp.
Copyright (C) 2015 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/>. */
/* This wrapper-file is needed, because otherwise file
sysdeps/s390/s390-[32|64]/strcmp.S will be used. */
#include <sysdeps/s390/multiarch/strcmp.c>

21
sysdeps/s390/s390-64/multiarch/strcmp.c Normal file
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@ -0,0 +1,21 @@
/* Multiple versions of strcmp.
Copyright (C) 2015 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/>. */
/* This wrapper-file is needed, because otherwise file
sysdeps/s390/s390-[32|64]/strcmp.S will be used. */
#include <sysdeps/s390/multiarch/strcmp.c>