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powerpc: Optimized strncat for POWER8

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With new optimized strnlen for POWER8 [1], this patch adds
strncat for power8 to make use of optimized strlen and strnlen.
This is faster than POWER7 current implementation for larger strings.

Tested on powerpc64 and powerpc64le.

[1] https://sourceware.org/ml/libc-alpha/2017-03/msg00491.html

	* sysdeps/powerpc/powerpc64/multiarch/Makefile (sysdep_routines): Add
	strncat-power8.
	* sysdeps/powerpc/powerpc64/multiarch/strncat.c (strncat): Add
	__strncat_power8 to ifunc list.
	* sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
	(strncat): Add __strncat_power8 to list of strncat functions.
	* sysdeps/powerpc/powerpc64/multiarch/strncat-power8.c: New file.
This commit is contained in:
Rajalakshmi Srinivasaraghavan 2017-04-13 11:29:20 +05:30
parent 158d5fa0e1
commit 249dcdb71b
5 changed files with 50 additions and 2 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2017-04-13 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc64/multiarch/Makefile (sysdep_routines): Add
strncat-power8.
* sysdeps/powerpc/powerpc64/multiarch/strncat.c (strncat): Add
__strncat_power8 to ifunc list.
* sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
(strncat): Add __strncat_power8 to list of strncat functions.
* sysdeps/powerpc/powerpc64/multiarch/strncat-power8.c: New file.
2017-04-11 Adhemerval Zanella <adhemerval.zanella@linaro.org>
[BZ #21270]

3
sysdeps/powerpc/powerpc64/multiarch/Makefile
View file

@ -15,7 +15,8 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
strchrnul-power8 strchrnul-power7 strchrnul-ppc64 \
strcpy-power8 strcpy-power7 strcpy-ppc64 stpcpy-power8 \
stpcpy-power7 stpcpy-ppc64 \
strrchr-power7 strrchr-ppc64 strncat-power7 strncat-ppc64 \
strrchr-power7 strrchr-ppc64 \
strncat-power8 strncat-power7 strncat-ppc64 \
strncpy-power7 strncpy-ppc64 \
stpncpy-power8 stpncpy-power7 stpncpy-ppc64 \
strcmp-power9 strcmp-power8 strcmp-power7 strcmp-ppc64 \

3
sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
View file

@ -291,6 +291,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
/* Support sysdeps/powerpc/powerpc64/multiarch/strncat.c. */
IFUNC_IMPL (i, name, strncat,
IFUNC_IMPL_ADD (array, i, strncat,
hwcap2 & PPC_FEATURE2_ARCH_2_07,
__strncat_power8)
IFUNC_IMPL_ADD (array, i, strncat,
hwcap & PPC_FEATURE_HAS_VSX,
__strncat_power7)

31
sysdeps/powerpc/powerpc64/multiarch/strncat-power8.c Normal file
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@ -0,0 +1,31 @@
/* Copyright (C) 2017 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 <string.h>
#define STRNCAT __strncat_power8
extern __typeof (strncat) __strncat_power8 attribute_hidden;
extern __typeof (strlen) __strlen_power8 attribute_hidden;
extern __typeof (strnlen) __strnlen_power8 attribute_hidden;
extern __typeof (memcpy) __memcpy_power7 attribute_hidden;
#define strlen __strlen_power8
#define __strnlen __strnlen_power8
#define memcpy __memcpy_power7
#include <string/strncat.c>

5
sysdeps/powerpc/powerpc64/multiarch/strncat.c
View file

@ -23,9 +23,12 @@
extern __typeof (strncat) __strncat_ppc attribute_hidden;
extern __typeof (strncat) __strncat_power7 attribute_hidden;
extern __typeof (strncat) __strncat_power8 attribute_hidden;
libc_ifunc (strncat,
(hwcap & PPC_FEATURE_HAS_VSX)
(hwcap & PPC_FEATURE2_ARCH_2_07)
? __strncat_power8
: (hwcap & PPC_FEATURE_HAS_VSX)
? __strncat_power7
: __strncat_ppc);
#endif