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This patch provides optimized versions of strncat and wcsncat with the z13
vector instructions.
ChangeLog:
* sysdeps/s390/multiarch/strncat-c.c: New File.
* sysdeps/s390/multiarch/strncat-vx.S: Likewise.
* sysdeps/s390/multiarch/strncat.c: Likewise.
* sysdeps/s390/multiarch/wcsncat-c.c: Likewise.
* sysdeps/s390/multiarch/wcsncat-vx.S: Likewise.
* sysdeps/s390/multiarch/wcsncat.c: Likewise.
* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strncat and
wcsncat functions.
* sysdeps/s390/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Add ifunc test for strncat, wcsncat.
* wcsmbs/wcsncat.c (WCSNCAT): Define and use macro.
* string/test-strncat.c: Add wcsncat support.
* wcsmbs/test-wcsncat.c: New File.
* wcsmbs/Makefile (strop-tests): Add wcsncat.
* benchtests/bench-strncat.c: Add wcsncat support.
* benchtests/bench-wcsncat.c: New File.
* benchtests/Makefile (wcsmbs-bench): Add wcsncat.
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