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S390: Refactor rawmemchr ifunc handling.

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The ifunc handling for rawmemchr 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 rawmemchr variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add rawmemchr variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for rawmemchr.
	* sysdeps/s390/multiarch/rawmemchr-c.c: Move to ...
	* sysdeps/s390/rawmemchr-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/rawmemchr-vx.S: Move to ...
	* sysdeps/s390/rawmemchr-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/rawmemchr.c: Move to ...
	* sysdeps/s390/rawmemchr.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-rawmemchr.h: New file.
This commit is contained in:
Stefan Liebler 2018-12-18 13:57:16 +01:00
parent 581a051c2e
commit 4c7b3cec11
8 changed files with 133 additions and 32 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 rawmemchr variants.
* sysdeps/s390/Makefile (sysdep_routines): Add rawmemchr variants.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Refactor ifunc handling for rawmemchr.
* sysdeps/s390/multiarch/rawmemchr-c.c: Move to ...
* sysdeps/s390/rawmemchr-c.c: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/rawmemchr-vx.S: Move to ...
* sysdeps/s390/rawmemchr-vx.S: ... here and adjust ifunc handling.
* sysdeps/s390/multiarch/rawmemchr.c: Move to ...
* sysdeps/s390/rawmemchr.c: ... here and adjust ifunc handling.
* sysdeps/s390/ifunc-rawmemchr.h: New file.
2018-12-18 Stefan Liebler <stli@linux.ibm.com>
* sysdeps/s390/multiarch/Makefile

3
sysdeps/s390/Makefile
View File

@ -76,5 +76,6 @@ sysdep_routines += bzero memset memset-z900 \
strspn strspn-vx strspn-c \
strpbrk strpbrk-vx strpbrk-c \
strcspn strcspn-vx strcspn-c \
memchr memchr-vx memchr-z900
memchr memchr-vx memchr-z900 \
rawmemchr rawmemchr-vx rawmemchr-c
endif

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

@ -0,0 +1,52 @@
/* rawmemchr 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_RAWMEMCHR_IFUNC 1
#else
# define HAVE_RAWMEMCHR_IFUNC 0
#endif
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define HAVE_RAWMEMCHR_IFUNC_AND_VX_SUPPORT HAVE_RAWMEMCHR_IFUNC
#else
# define HAVE_RAWMEMCHR_IFUNC_AND_VX_SUPPORT 0
#endif
#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
# define RAWMEMCHR_DEFAULT RAWMEMCHR_Z13
# define HAVE_RAWMEMCHR_C 0
# define HAVE_RAWMEMCHR_Z13 1
#else
# define RAWMEMCHR_DEFAULT RAWMEMCHR_C
# define HAVE_RAWMEMCHR_C 1
# define HAVE_RAWMEMCHR_Z13 HAVE_RAWMEMCHR_IFUNC_AND_VX_SUPPORT
#endif
#if HAVE_RAWMEMCHR_C
# define RAWMEMCHR_C __rawmemchr_c
#else
# define RAWMEMCHR_C NULL
#endif
#if HAVE_RAWMEMCHR_Z13
# define RAWMEMCHR_Z13 __rawmemchr_vx
#else
# define RAWMEMCHR_Z13 NULL
#endif

3
sysdeps/s390/multiarch/Makefile
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@ -1,6 +1,5 @@
ifeq ($(subdir),string)
sysdep_routines += rawmemchr rawmemchr-vx rawmemchr-c \
memccpy memccpy-vx memccpy-c \
sysdep_routines += memccpy memccpy-vx memccpy-c \
memrchr memrchr-vx memrchr-c
endif

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

@ -43,6 +43,7 @@
#include <ifunc-strpbrk.h>
#include <ifunc-strcspn.h>
#include <ifunc-memchr.h>
#include <ifunc-rawmemchr.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@ -385,6 +386,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_MEMCHR_IFUNC */
#if HAVE_RAWMEMCHR_IFUNC
IFUNC_IMPL (i, name, rawmemchr,
# if HAVE_RAWMEMCHR_Z13
IFUNC_IMPL_ADD (array, i, rawmemchr,
dl_hwcap & HWCAP_S390_VX, RAWMEMCHR_Z13)
# endif
# if HAVE_RAWMEMCHR_C
IFUNC_IMPL_ADD (array, i, rawmemchr, 1, RAWMEMCHR_C)
# endif
)
#endif /* HAVE_RAWMEMCHR_IFUNC */
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@ -426,7 +439,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_VX_IMPL (wcscspn);
IFUNC_VX_IMPL (wmemchr);
IFUNC_VX_IMPL (rawmemchr);
IFUNC_VX_IMPL (memccpy);

25
sysdeps/s390/multiarch/rawmemchr.c → sysdeps/s390/rawmemchr-c.c
View File

@ -1,4 +1,4 @@
/* Multiple versions of rawmemchr.
/* Default rawmemchr implementation for S/390.
Copyright (C) 2015-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -16,16 +16,19 @@
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 __rawmemchr __redirect___rawmemchr
# include <string.h>
# undef __rawmemchr
# include <ifunc-resolve.h>
#include <ifunc-rawmemchr.h>
s390_vx_libc_ifunc2_redirected (__redirect___rawmemchr, __rawmemchr
, __rawmemchr)
weak_alias (__rawmemchr, rawmemchr)
#if HAVE_RAWMEMCHR_C
# if HAVE_RAWMEMCHR_IFUNC
# define RAWMEMCHR RAWMEMCHR_C
# undef weak_alias
# define weak_alias(a, b)
# if defined SHARED && IS_IN (libc)
# undef libc_hidden_def
# define libc_hidden_def(name) \
__hidden_ver1 (__rawmemchr_c, __GI___rawmemchr, __rawmemchr_c);
# endif
# endif
#else
# include <string/rawmemchr.c>
#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
#endif

20
sysdeps/s390/multiarch/rawmemchr-vx.S → sysdeps/s390/rawmemchr-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-rawmemchr.h>
#if HAVE_RAWMEMCHR_Z13
# include "sysdep.h"
# include "asm-syntax.h"
@ -37,7 +39,7 @@
-v17=index of unequal
-v18=c replicated
*/
ENTRY(__rawmemchr_vx)
ENTRY(RAWMEMCHR_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
@ -88,5 +90,15 @@ ENTRY(__rawmemchr_vx)
.Lend_found:
la %r2,0(%r5,%r2) /* Return pointer to character. */
br %r14
END(__rawmemchr_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
END(RAWMEMCHR_Z13)
# if ! HAVE_RAWMEMCHR_IFUNC
strong_alias (RAWMEMCHR_Z13, __rawmemchr)
weak_alias (__rawmemchr, rawmemchr)
# endif
# if ! HAVE_RAWMEMCHR_C && defined SHARED && IS_IN (libc)
strong_alias (RAWMEMCHR_Z13, __GI___rawmemchr)
# endif
#endif /* HAVE_RAWMEMCHR_Z13 */

33
sysdeps/s390/multiarch/rawmemchr-c.c → sysdeps/s390/rawmemchr.c
View File

@ -1,4 +1,4 @@
/* Default rawmemchr implementation for S/390.
/* Multiple versions of rawmemchr.
Copyright (C) 2015-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -16,19 +16,26 @@
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-rawmemchr.h>
#if HAVE_RAWMEMCHR_IFUNC
# define __rawmemchr __redirect___rawmemchr
# include <string.h>
# undef __rawmemchr
# include <ifunc-resolve.h>
# define RAWMEMCHR __rawmemchr_c
# undef weak_alias
# define weak_alias(a, b)
# ifdef SHARED
# undef libc_hidden_def
# define libc_hidden_def(name) \
__hidden_ver1 (__rawmemchr_c, __GI___rawmemchr, __rawmemchr_c);
# endif /* SHARED */
# if HAVE_RAWMEMCHR_C
extern __typeof (__redirect___rawmemchr) RAWMEMCHR_C attribute_hidden;
# endif
extern __typeof (rawmemchr) __rawmemchr_c attribute_hidden;
# if HAVE_RAWMEMCHR_Z13
extern __typeof (__redirect___rawmemchr) RAWMEMCHR_Z13 attribute_hidden;
# endif
# include <string/rawmemchr.c>
#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
s390_libc_ifunc_expr (__redirect___rawmemchr, __rawmemchr,
(HAVE_RAWMEMCHR_Z13 && (hwcap & HWCAP_S390_VX))
? RAWMEMCHR_Z13
: RAWMEMCHR_DEFAULT
)
weak_alias (__rawmemchr, rawmemchr)
#endif /* HAVE_RAWMEMCHR_IFUNC */