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S390: Refactor strcmp ifunc handling.

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The ifunc handling for strcmp 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.

Note: The fallback s390-32/s390-64 ifunc variants with clst instruction
are now moved to the unified strcmp-z900.S file which can be used for
31/64bit. The s390-32/s390-64 files multiarch/strcmp.c and strcmp.S
are deleted.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove strcmp variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add strcmp variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for strcmp.
	* sysdeps/s390/multiarch/strcmp-vx.S: Move to ...
	* sysdeps/s390/strcmp-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/strcmp.c: Move to ...
	* sysdeps/s390/strcmp.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-strcmp.h: New file.
	* sysdeps/s390/s390-64/strcmp.S: Move to ...
	* sysdeps/s390/strcmp-z900.S: ... here and adjust to be usable
	for 31/64bit and ifunc handling.
	* sysdeps/s390/s390-32/multiarch/strcmp.c: Delete file.
	* sysdeps/s390/s390-64/multiarch/strcmp.c: Likewise.
	* sysdeps/s390/s390-32/strcmp.S: Likewise.
This commit is contained in:
Stefan Liebler
2018-12-18 13:57:13 +01:00
parent b935335155
commit cdab85fe33
11 changed files with 138 additions and 104 deletions
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14
sysdeps/s390/multiarch/ifunc-impl-list.c
View File

@@ -34,6 +34,7 @@
#include <ifunc-stpncpy.h>
#include <ifunc-strcat.h>
#include <ifunc-strncat.h>
#include <ifunc-strcmp.h>
/* Maximum number of IFUNC implementations. */
#define MAX_IFUNC 3
@@ -268,6 +269,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_STRNCAT_IFUNC */
#if HAVE_STRCMP_IFUNC
IFUNC_IMPL (i, name, strcmp,
# if HAVE_STRCMP_Z13
IFUNC_IMPL_ADD (array, i, strcmp,
dl_hwcap & HWCAP_S390_VX, STRCMP_Z13)
# endif
# if HAVE_STRCMP_Z900_G5
IFUNC_IMPL_ADD (array, i, strcmp, 1, STRCMP_Z900_G5)
# endif
)
#endif /* HAVE_STRCMP_IFUNC */
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \
@@ -292,7 +305,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
IFUNC_VX_IMPL (wcsncat);
IFUNC_VX_IMPL (strcmp);
IFUNC_VX_IMPL (wcscmp);
IFUNC_VX_IMPL (strncmp);