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Faster memset on x64

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This implementation speed up memset in several ways. First is avoiding
expensive computed jump. Second is using fact that arguments of memset
are most of time aligned to 8 bytes.

Benchmark results on:
kam.mff.cuni.cz/~ondra/benchmark_string/memset_profile_result27_04_13.tar.bz2
This commit is contained in:
Ondrej Bilka 2013-05-20 08:26:00 +02:00
parent 2d48b41c8f
commit b2b671b677
2 changed files with 96 additions and 1315 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2013-05-20 Ondřej Bílka <neleai@seznam.cz>
* sysdeps/x86_64/memset.S (memset): New implementation.
(__bzero): Likewise.
(__memset_tail): New function.
2013-05-20 Ondřej Bílka <neleai@seznam.cz>
* sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S: New file.

1405
sysdeps/x86_64/memset.S
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