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S390: Refactor strncat ifunc handling.

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The ifunc handling for strncat is adjusted in order to omit ifunc
variants if those will never be used as the minimum architecture level
already supports newer CPUs by default.
Glibc internal calls will then also use the "newer" ifunc variant.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove strncat variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add strncat variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for strncat.
	* sysdeps/s390/multiarch/strncat-c.c: Move to ...
	* sysdeps/s390/strncat-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/strncat-vx.S: Move to ...
	* sysdeps/s390/strncat-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/strncat.c: Move to ...
	* sysdeps/s390/strncat.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-strncat.h: New file.
This commit is contained in:
Stefan Liebler 2018-12-18 13:57:12 +01:00
parent 8e5a0afbbf
commit b935335155
8 changed files with 123 additions and 16 deletions
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15
ChangeLog
View File

@ -1,3 +1,18 @@
2018-12-18 Stefan Liebler <stli@linux.ibm.com>
* sysdeps/s390/multiarch/Makefile
(sysdep_routines): Remove strncat variants.
* sysdeps/s390/Makefile (sysdep_routines): Add strncat variants.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Refactor ifunc handling for strncat.
* sysdeps/s390/multiarch/strncat-c.c: Move to ...
* sysdeps/s390/strncat-c.c: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/strncat-vx.S: Move to ...
* sysdeps/s390/strncat-vx.S: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/strncat.c: Move to ...
* sysdeps/s390/strncat.c: ... here and adjust ifunc handling.
* sysdeps/s390/ifunc-strncat.h: New file.
2018-12-18 Stefan Liebler <stli@linux.ibm.com>
* sysdeps/s390/multiarch/Makefile

3
sysdeps/s390/Makefile
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@ -66,5 +66,6 @@ sysdep_routines += bzero memset memset-z900 \
stpcpy stpcpy-vx stpcpy-c \
strncpy strncpy-vx strncpy-z900 \
stpncpy stpncpy-vx stpncpy-c \
strcat strcat-vx strcat-c
strcat strcat-vx strcat-c \
strncat strncat-vx strncat-c
endif

52
sysdeps/s390/ifunc-strncat.h Normal file
View File

@ -0,0 +1,52 @@
/* strncat variant information on S/390 version.
Copyright (C) 2018 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 USE_MULTIARCH && IS_IN (libc) \
&& ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
# define HAVE_STRNCAT_IFUNC 1
#else
# define HAVE_STRNCAT_IFUNC 0
#endif
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define HAVE_STRNCAT_IFUNC_AND_VX_SUPPORT HAVE_STRNCAT_IFUNC
#else
# define HAVE_STRNCAT_IFUNC_AND_VX_SUPPORT 0
#endif
#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
# define STRNCAT_DEFAULT STRNCAT_Z13
# define HAVE_STRNCAT_C 0
# define HAVE_STRNCAT_Z13 1
#else
# define STRNCAT_DEFAULT STRNCAT_C
# define HAVE_STRNCAT_C 1
# define HAVE_STRNCAT_Z13 HAVE_STRNCAT_IFUNC_AND_VX_SUPPORT
#endif
#if HAVE_STRNCAT_C
# define STRNCAT_C __strncat_c
#else
# define STRNCAT_C NULL
#endif
#if HAVE_STRNCAT_Z13
# define STRNCAT_Z13 __strncat_vx
#else
# define STRNCAT_Z13 NULL
#endif

3
sysdeps/s390/multiarch/Makefile
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@ -1,6 +1,5 @@
ifeq ($(subdir),string)
sysdep_routines += strncat strncat-vx strncat-c \
strcmp strcmp-vx \
sysdep_routines += strcmp strcmp-vx \
strncmp strncmp-vx strncmp-c \
strchr strchr-vx strchr-c \
strchrnul strchrnul-vx strchrnul-c \

14
sysdeps/s390/multiarch/ifunc-impl-list.c
View File

@ -33,6 +33,7 @@
#include <ifunc-strncpy.h>
#include <ifunc-stpncpy.h>
#include <ifunc-strcat.h>
#include <ifunc-strncat.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@ -255,6 +256,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_STRCAT_IFUNC */
#if HAVE_STRNCAT_IFUNC
IFUNC_IMPL (i, name, strncat,
# if HAVE_STRNCAT_Z13
IFUNC_IMPL_ADD (array, i, strncat,
dl_hwcap & HWCAP_S390_VX, STRNCAT_Z13)
# endif
# if HAVE_STRNCAT_C
IFUNC_IMPL_ADD (array, i, strncat, 1, STRNCAT_C)
# endif
)
#endif /* HAVE_STRNCAT_IFUNC */
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@ -277,7 +290,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_VX_IMPL (wcscat);
IFUNC_VX_IMPL (strncat);
IFUNC_VX_IMPL (wcsncat);
IFUNC_VX_IMPL (strcmp);

10
sysdeps/s390/multiarch/strncat-c.c → sysdeps/s390/strncat-c.c
View File

@ -16,8 +16,12 @@
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 STRNCAT __strncat_c
# define STRNCAT_PRIMARY
#include <ifunc-strncat.h>
#if HAVE_STRNCAT_C
# if HAVE_STRNCAT_IFUNC
# define STRNCAT STRNCAT_C
# define STRNCAT_PRIMARY
# endif
# include <string/strncat.c>
#endif

21
sysdeps/s390/multiarch/strncat-vx.S → sysdeps/s390/strncat-vx.S
View File

@ -16,7 +16,8 @@
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 <ifunc-strncat.h>
#if HAVE_STRNCAT_Z13
# include "sysdep.h"
# include "asm-syntax.h"
@ -40,7 +41,7 @@
-v18=part of src
-v31=register save area for r6, r7
*/
ENTRY(__strncat_vx)
ENTRY(STRNCAT_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
@ -235,5 +236,17 @@ ENTRY(__strncat_vx)
vl %v16,0(%r5,%r3) /* Load s. */
j .Lcpy_lt64
END(__strncat_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
END(STRNCAT_Z13)
# if ! HAVE_STRNCAT_IFUNC
strong_alias (STRNCAT_Z13, strncat)
# endif
# if ! HAVE_STRNCAT_C
/* See string/strncat.c and define STRNCAT_PRIMARY. */
strong_alias (STRNCAT_Z13, __strncat)
# if defined SHARED && IS_IN (libc)
strong_alias (__strncat, __GI___strncat)
# endif
# endif
#endif

21
sysdeps/s390/multiarch/strncat.c → sysdeps/s390/strncat.c
View File

@ -16,12 +16,23 @@
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 <ifunc-strncat.h>
#if HAVE_STRNCAT_IFUNC
# include <string.h>
# include <ifunc-resolve.h>
s390_vx_libc_ifunc2 (__strncat, strncat)
# if HAVE_STRNCAT_C
extern __typeof (__strncat) STRNCAT_C attribute_hidden;
# endif
#else
# include <string/strncat.c>
#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
# if HAVE_STRNCAT_Z13
extern __typeof (__strncat) STRNCAT_Z13 attribute_hidden;
# endif
s390_libc_ifunc_expr (__strncat, strncat,
(HAVE_STRNCAT_Z13 && (hwcap & HWCAP_S390_VX))
? STRNCAT_Z13
: STRNCAT_DEFAULT
)
#endif