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S390: Add z13 memmove ifunc variant.

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This patch introduces a z13 specific ifunc variant for memmove.
As the common code implementation, it checks if we can copy from
the beginning to the end - with z196 memcpy implementation - or
if we have to copy from the end to the beginning.
The latter case is done by using vector load/store instructions.

If vector instructions are not available, the common-code is
used as fallback.  Therefore it is implemented in memmove-c with
a different name.
Furthermore the ifunc logic decides if we need the common-code
implementation at all.  If vector instructions are supported
due to the minimum architecture level set we can skip the
common-code ifunc variant.

ChangeLog:

	* sysdeps/s390/Makefile (sysdep_routines): Add memmove-c.
	* sysdeps/s390/ifunc-memcpy.h (HAVE_MEMMOVE_IFUNC,
	HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT, MEMMOVE_DEFAULT,
	HAVE_MEMMOVE_C, MEMMOVE_C,  HAVE_MEMMOVE_Z13, MEMMOVE_Z13):
	New defines.
	* sysdeps/s390/memcpy-z900.S: Add z13 memmove implementation.
	* sysdeps/s390/memmove-c.c: New file.
	* sysdeps/s390/memmove.c: Likewise.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc variants for memmove.
This commit is contained in:
Stefan Liebler
2018-12-18 13:57:08 +01:00
parent 2ee1bc57ab
commit cdd927d98c
7 changed files with 230 additions and 1 deletions
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12
sysdeps/s390/multiarch/ifunc-impl-list.c
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@@ -126,6 +126,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
)
#endif /* HAVE_MEMCPY_IFUNC */
#if HAVE_MEMMOVE_IFUNC
IFUNC_IMPL (i, name, memmove,
# if HAVE_MEMMOVE_Z13
IFUNC_IMPL_ADD (array, i, memmove,
dl_hwcap & HWCAP_S390_VX, MEMMOVE_Z13)
# endif
# if HAVE_MEMMOVE_C
IFUNC_IMPL_ADD (array, i, memmove, 1, MEMMOVE_C)
# endif
)
#endif /* HAVE_MEMMOVE_IFUNC */
#ifdef HAVE_S390_VX_ASM_SUPPORT
# define IFUNC_VX_IMPL(FUNC) \