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S390: Refactor wcsncat ifunc handling.

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The ifunc handling for wcsncat is adjusted in order to omit ifunc
if the minimum architecture level already supports newer CPUs by default.
Unfortunately the c ifunc variant can't be omitted at all as it is used
by the z13 ifunc variant as fallback if the pointers are not 4-byte aligned.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove wcsncat variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add wcsncat variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for wcsncat.
	* sysdeps/s390/multiarch/wcsncat-c.c: Move to ...
	* sysdeps/s390/wcsncat-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/wcsncat-vx.S: Move to ...
	* sysdeps/s390/wcsncat-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/wcsncat.c: Move to ...
	* sysdeps/s390/wcsncat.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-wcsncat.h: New file.
This commit is contained in:
Stefan Liebler
2018-12-18 13:57:20 +01:00
parent 3389cae427
commit 814a76e1bc
8 changed files with 116 additions and 19 deletions
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15
sysdeps/s390/multiarch/ifunc-impl-list.c
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@@ -53,6 +53,7 @@
#include <ifunc-wcsncpy.h>
#include <ifunc-wcpncpy.h>
#include <ifunc-wcscat.h>
#include <ifunc-wcsncat.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@@ -515,6 +516,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_WCSCAT_IFUNC */
#if HAVE_WCSNCAT_IFUNC
IFUNC_IMPL (i, name, wcsncat,
# if HAVE_WCSNCAT_Z13
IFUNC_IMPL_ADD (array, i, wcsncat,
dl_hwcap & HWCAP_S390_VX, WCSNCAT_Z13)
# endif
# if HAVE_WCSNCAT_C
IFUNC_IMPL_ADD (array, i, wcsncat, 1, WCSNCAT_C)
# endif
)
#endif /* HAVE_WCSNCAT_IFUNC */
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@@ -523,8 +536,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
__##FUNC##_vx) \
IFUNC_IMPL_ADD (array, i, FUNC, 1, __##FUNC##_c))
IFUNC_VX_IMPL (wcsncat);
IFUNC_VX_IMPL (wcscmp);
IFUNC_VX_IMPL (wcsncmp);