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This patch provides optimized version of wmemset with the z13 vector
instructions.
ChangeLog:
* sysdeps/s390/multiarch/wmemset-c.c: New File.
* sysdeps/s390/multiarch/wmemset-vx.S: Likewise.
* sysdeps/s390/multiarch/wmemset.c: Likewise.
* sysdeps/s390/multiarch/Makefile
(sysdep_routines): Add wmemset functions.
* sysdeps/s390/multiarch/ifunc-impl-list-common.c
(__libc_ifunc_impl_list_common): Add ifunc test for wmemset.
* wcsmbs/wmemset.c: Use WMEMSET if defined.
* string/test-memset.c: Add wmemset support.
* wcsmbs/test-wmemset.c: New File.
* wcsmbs/Makefile (strop-tests): Add wmemset.
* benchtests/bench-memset.c: Add wmemset support.
* benchtests/bench-wmemset.c: New File.
* benchtests/Makefile (wcsmbs-bench): Add wmemset.
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