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| author |  David Turner <dturner@twopensource.com> | 2014-06-18 01:54:42 -0400 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2014-06-18 10:57:18 -0700 |
| commit | 745224e04a03e4544c58d5d38d3c54f67100f8eb (patch) | |
| tree | 615a8a79eaedbb737408f3b3c2ff8f0940f92684 /t/t4020-diff-external.sh | |
| parent | refs.c: optimize check_refname_component() (diff) | |
| download | tgif-745224e04a03e4544c58d5d38d3c54f67100f8eb.tar.xz | |
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>
Diffstat (limited to 't/t4020-diff-external.sh')
0 files changed, 0 insertions, 0 deletions