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S390: Refactor stpncpy ifunc handling.

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The ifunc handling for stpncpy 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 stpncpy variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add stpncpy variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for stpncpy.
	* sysdeps/s390/multiarch/stpncpy-c.c: Move to ...
	* sysdeps/s390/stpncpy-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/stpncpy-vx.S: Move to ...
	* sysdeps/s390/stpncpy-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/stpncpy.c: Move to ...
	* sysdeps/s390/stpncpy.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-stpncpy.h: New file.
This commit is contained in:
Stefan Liebler 2018-12-18 13:57:11 +01:00
parent d1bdbf3809
commit 25218822bd
8 changed files with 128 additions and 22 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 stpncpy variants.
* sysdeps/s390/Makefile (sysdep_routines): Add stpncpy variants.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Refactor ifunc handling for stpncpy.
* sysdeps/s390/multiarch/stpncpy-c.c: Move to ...
* sysdeps/s390/stpncpy-c.c: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/stpncpy-vx.S: Move to ...
* sysdeps/s390/stpncpy-vx.S: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/stpncpy.c: Move to ...
* sysdeps/s390/stpncpy.c: ... here and adjust ifunc handling.
* sysdeps/s390/ifunc-stpncpy.h: New file.
2018-12-18 Stefan Liebler <stli@linux.ibm.com>
* sysdeps/s390/multiarch/Makefile

3
sysdeps/s390/Makefile
View File

@ -64,5 +64,6 @@ sysdep_routines += bzero memset memset-z900 \
strnlen strnlen-vx strnlen-c \
strcpy strcpy-vx strcpy-z900 \
stpcpy stpcpy-vx stpcpy-c \
strncpy strncpy-vx strncpy-z900
strncpy strncpy-vx strncpy-z900 \
stpncpy stpncpy-vx stpncpy-c
endif

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

@ -0,0 +1,52 @@
/* stpncpy 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_STPNCPY_IFUNC 1
#else
# define HAVE_STPNCPY_IFUNC 0
#endif
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define HAVE_STPNCPY_IFUNC_AND_VX_SUPPORT HAVE_STPNCPY_IFUNC
#else
# define HAVE_STPNCPY_IFUNC_AND_VX_SUPPORT 0
#endif
#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
# define STPNCPY_DEFAULT STPNCPY_Z13
# define HAVE_STPNCPY_C 0
# define HAVE_STPNCPY_Z13 1
#else
# define STPNCPY_DEFAULT STPNCPY_C
# define HAVE_STPNCPY_C 1
# define HAVE_STPNCPY_Z13 HAVE_STPNCPY_IFUNC_AND_VX_SUPPORT
#endif
#if HAVE_STPNCPY_C
# define STPNCPY_C __stpncpy_c
#else
# define STPNCPY_C NULL
#endif
#if HAVE_STPNCPY_Z13
# define STPNCPY_Z13 __stpncpy_vx
#else
# define STPNCPY_Z13 NULL
#endif

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

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

@ -31,6 +31,7 @@
#include <ifunc-strcpy.h>
#include <ifunc-stpcpy.h>
#include <ifunc-strncpy.h>
#include <ifunc-stpncpy.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@ -229,6 +230,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_STRNCPY_IFUNC */
#if HAVE_STPNCPY_IFUNC
IFUNC_IMPL (i, name, stpncpy,
# if HAVE_STPNCPY_Z13
IFUNC_IMPL_ADD (array, i, stpncpy,
dl_hwcap & HWCAP_S390_VX, STPNCPY_Z13)
# endif
# if HAVE_STPNCPY_C
IFUNC_IMPL_ADD (array, i, stpncpy, 1, STPNCPY_C)
# endif
)
#endif /* HAVE_STPNCPY_IFUNC */
#ifdef HAVE_S390_VX_ASM_SUPPORT
@ -248,7 +261,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_VX_IMPL (wcsncpy);
IFUNC_VX_IMPL (stpncpy);
IFUNC_VX_IMPL (wcpncpy);
IFUNC_VX_IMPL (strcat);

21
sysdeps/s390/multiarch/stpncpy-c.c → sysdeps/s390/stpncpy-c.c
View File

@ -16,13 +16,18 @@
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 STPNCPY __stpncpy_c
# ifdef SHARED
# undef libc_hidden_def
# define libc_hidden_def(name) \
__hidden_ver1 (__stpncpy_c, __GI___stpncpy, __stpncpy_c);
# endif /* SHARED */
#include <ifunc-stpncpy.h>
#if HAVE_STPNCPY_C
# if HAVE_STPNCPY_IFUNC
# define STPNCPY STPNCPY_C
# if defined SHARED && IS_IN (libc)
# undef libc_hidden_def
# define libc_hidden_def(name) \
__hidden_ver1 (__stpncpy_c, __GI___stpncpy, __stpncpy_c);
# endif
# endif
# include <string/stpncpy.c>
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
#endif

19
sysdeps/s390/multiarch/stpncpy-vx.S → sysdeps/s390/stpncpy-vx.S
View File

@ -16,7 +16,9 @@
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-stpncpy.h>
#if HAVE_STPNCPY_Z13
# include "sysdep.h"
# include "asm-syntax.h"
@ -38,7 +40,7 @@
-%r6 = loaded bytes
-%r7 = border, tmp
*/
ENTRY(__stpncpy_vx)
ENTRY(STPNCPY_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
@ -196,5 +198,14 @@ ENTRY(__stpncpy_vx)
vl %v16,0(%r5,%r3) /* Load s. */
j .Llt64
END(__stpncpy_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
END(STPNCPY_Z13)
# if ! HAVE_STPNCPY_IFUNC
strong_alias (STPNCPY_Z13, __stpncpy)
weak_alias (__stpncpy, stpncpy)
# endif
# if ! HAVE_STPNCPY_C && defined SHARED && IS_IN (libc)
strong_alias (STPNCPY_Z13, __GI___stpncpy)
# endif
#endif

23
sysdeps/s390/multiarch/stpncpy.c → sysdeps/s390/stpncpy.c
View File

@ -16,7 +16,9 @@
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-stpncpy.h>
#if HAVE_STPNCPY_IFUNC
# define stpncpy __redirect_stpncpy
# define __stpncpy __redirect___stpncpy
# include <string.h>
@ -24,9 +26,18 @@
# undef __stpncpy
# include <ifunc-resolve.h>
s390_vx_libc_ifunc_redirected (__redirect___stpncpy, __stpncpy)
weak_alias (__stpncpy, stpncpy)
# if HAVE_STPNCPY_C
extern __typeof (__redirect_stpncpy) STPNCPY_C attribute_hidden;
# endif
#else
# include <string/stpncpy.c>
#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
# if HAVE_STPNCPY_Z13
extern __typeof (__redirect_stpncpy) STPNCPY_Z13 attribute_hidden;
# endif
s390_libc_ifunc_expr (__redirect___stpncpy, __stpncpy,
(HAVE_STPNCPY_Z13 && (hwcap & HWCAP_S390_VX))
? STPNCPY_Z13
: STPNCPY_DEFAULT
)
weak_alias (__stpncpy, stpncpy)
#endif