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| author | Ondrej Bilka <neleai@seznam.cz> | 2013-05-20 08:20:00 +0200 |
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| committer | Ondrej Bilka <neleai@seznam.cz> | 2013-05-20 08:24:41 +0200 |
| commit | 2d48b41c8fa610067c4d664ac2339ae6ca43e78c (patch) | |
| tree | 4d1ca07a1228ba16c12a67ddb08595770f397da1 /ChangeLog | |
| parent | 3e694268750d51acc6a68b0ee7ded25a52902c20 (diff) | |
| download | glibc-2d48b41c8fa610067c4d664ac2339ae6ca43e78c.tar.gz glibc-2d48b41c8fa610067c4d664ac2339ae6ca43e78c.tar.xz glibc-2d48b41c8fa610067c4d664ac2339ae6ca43e78c.zip | |
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
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index a2323faff4..6c540a7e23 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,13 @@ +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] |