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authorH.J. Lu <hjl.tools@gmail.com>2017-05-26 12:21:55 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-06-08 05:07:18 -0700
commit468dd82cbea3e8aa954229958a6b9aae623bcb30 (patch)
tree9a6ace5760af31c4edb1dbcc88e02ae82dd4a0ae /ChangeLog.old-ports-microblaze
parent6f6e1e2e9ab2edaaf2fa20913b195733b08cb0a9 (diff)
downloadglibc-hjl/avx2/master.tar.gz
glibc-hjl/avx2/master.tar.xz
glibc-hjl/avx2/master.zip
x86-64: Optimize strrchr/wcsrchr with AVX2 hjl/avx2/master
Optimize strrchr/wcsrchr with AVX2 to check 32 bytes with vector
instructions.  It is as fast as SSE2 version for small data sizes
and up to 1X faster for large data sizes on Haswell.  Select AVX2
version on AVX2 machines where vzeroupper is preferred and AVX
unaligned load is fast.

	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
	strrchr-sse2, strrchr-avx2, wcsrchr-sse2 and wcsrchr-avx2.
	* sysdeps/x86_64/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add tests for __strrchr_avx2,
	__strrchr_sse2, __wcsrchr_avx2 and __wcsrchr_sse2.
	* sysdeps/x86_64/multiarch/strrchr-avx2.S: New file.
	* sysdeps/x86_64/multiarch/strrchr-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/strrchr.c: Likewise.
	* sysdeps/x86_64/multiarch/wcsrchr-avx2.S: Likewise.
	* sysdeps/x86_64/multiarch/wcsrchr-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/wcsrchr.c: Likewise.
Diffstat (limited to 'ChangeLog.old-ports-microblaze')
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