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authorDavid Turner <dturner@twopensource.com>2014-06-18 05:54:42 (GMT)
committerJunio C Hamano <gitster@pobox.com>2014-06-18 17:57:18 (GMT)
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refs.c: SSE2 optimizations for check_refname_component
Optimize check_refname_component using SSE2 on x86_64. git rev-parse HEAD is a good test-case for this, since it does almost nothing except parse refs. For one particular repo with about 60k refs, almost all packed, the timings are: Look up table: 29 ms SSE2: 23 ms This cuts about 20% off of the runtime. Ondřej Bílka <neleai@seznam.cz> suggested an SSE2 approach to the substring searches, which netted a speed boost over the SSE4.2 code I had initially written. Signed-off-by: David Turner <dturner@twitter.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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