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Shawn O. Pearce bed3229b55 Precompute the fanout decoding and the oid offset in a pack-*.idx
The fanout table is fairly commonly accessed, we need to read it
twice for each object we lookup in any given pack file.  Most of
the processors running Git are running in little-endian mode, as
they are variants of the x86 platform, so reading the fanout is
a costly operation as we need to convert from network byte order
to local byte order.  By decoding the fanout table into a malloc
obtained buffer we can save these 2 decode operations per lookup
and make search go more quickly.

This also cleans up the initialization of the search functions
by cutting out a few instructions, saving a small amount of time.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2009-01-03 03:34:09 -08:00
src Precompute the fanout decoding and the oid offset in a pack-*.idx 2009-01-03 03:34:09 -08:00
tests Rewrite git_foreach_dirent into gitfo_dirent 2008-12-31 15:35:36 -08:00
.gitignore Add pkg-config support. 2008-12-30 07:31:03 -08:00
.HEADER Switch the license from BSD to GPL+libgcc exception 2008-11-01 15:55:47 -07:00
api.doxygen doxygen config: Update path to public headers 2008-12-02 08:45:03 -08:00
CONVENTIONS Move include files to include/git/, drop git_ prefix from file names 2008-11-01 15:42:23 -07:00
COPYING Switch the license from BSD to GPL+libgcc exception 2008-11-01 15:55:47 -07:00
git.git-authors Add Adam Simpkins to list of consenting authors 2008-12-09 08:36:10 -08:00
libgit2.pc.in Fix pkgconfig file wrt last added dependencies 2008-12-30 16:50:45 -08:00
Makefile Add a build variable to allow supression of -fvisibility 2008-12-31 13:45:34 -08:00