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authorOndrej Bilka <neleai@seznam.cz>2013-05-20 08:20:00 +0200
committerOndrej Bilka <neleai@seznam.cz>2013-05-20 08:24:41 +0200
commit2d48b41c8fa610067c4d664ac2339ae6ca43e78c (patch)
tree4d1ca07a1228ba16c12a67ddb08595770f397da1 /ChangeLog
parent3e694268750d51acc6a68b0ee7ded25a52902c20 (diff)
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Faster memcpy on x64.
We add new memcpy version that uses unaligned loads which are fast
on modern processors. This allows second improvement which is avoiding
computed jump which is relatively expensive operation.

Tests available here:
http://kam.mff.cuni.cz/~ondra/memcpy_profile_result27_04_13.tar.bz2
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+2013-05-20  Ondřej Bílka  <neleai@seznam.cz>
+
+	* sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S: New file.
+	* sysdeps/x86_64/multiarch/memcpy.S (__new_memcpy): Add
+	__memcpy_sse2_unaligned ifunc selection.
+	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines):
+	Add memcpy-sse2-unaligned.S.
+	* sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list):
+	Add: __memcpy_sse2_unaligned.
+
 2013-05-19  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #15490]