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S390: Refactor wcscpy ifunc handling.

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The ifunc handling for wcscpy 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 wcscpy variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add wcscpy variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for wcscpy.
	* sysdeps/s390/multiarch/wcscpy-c.c: Move to ...
	* sysdeps/s390/wcscpy-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/wcscpy-vx.S: Move to ...
	* sysdeps/s390/wcscpy-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/wcscpy.c: Move to ...
	* sysdeps/s390/wcscpy.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-wcscpy.h: New file.
This commit is contained in:
Stefan Liebler
2018-12-18 13:57:18 +01:00
parent c7e7cd266e
commit 804f2e5c73
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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@@ -48,6 +48,7 @@
#include <ifunc-memrchr.h>
#include <ifunc-wcslen.h>
#include <ifunc-wcsnlen.h>
#include <ifunc-wcscpy.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@@ -450,6 +451,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_WCSNLEN_IFUNC */
#if HAVE_WCSCPY_IFUNC
IFUNC_IMPL (i, name, wcscpy,
# if HAVE_WCSCPY_Z13
IFUNC_IMPL_ADD (array, i, wcscpy,
dl_hwcap & HWCAP_S390_VX, WCSCPY_Z13)
# endif
# if HAVE_WCSCPY_C
IFUNC_IMPL_ADD (array, i, wcscpy, 1, WCSCPY_C)
# endif
)
#endif /* HAVE_WCSCPY_IFUNC */
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@@ -458,8 +471,6 @@ __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 (wcscpy);
IFUNC_VX_IMPL (wcpcpy);
IFUNC_VX_IMPL (wcsncpy);