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authorDan McGee <dan@archlinux.org>2012-01-02 13:29:40 -0600
committerDan McGee <dan@archlinux.org>2012-01-02 19:41:42 -0600
commit0b9cd9448c16dcf5e21ee8822698dbe908db520f (patch)
tree51061eb85fe69c880cf2497977102e022484152f /doc/asciidoc-override.css
parent177beb91c96a078f729bd11c2f6c1144082e69e3 (diff)
pkghash improvements/modifications
This patch changes a variety of small things related to our pkghash implementation with an eye toward performance, especially on native 32-bit systems. * Use `unsigned int` rather than `size_t` for hash sizes. We already return ERANGE for any attempted creation of a hash greater than 1 million elements, so unsigned int is more than large enough for our purposes. Switching to this type allows 32 bit systems to do native math without helper functions from libgcc. * _alpm_pkghash_create() now internally adds extra padding for additional array elements, rather than that being the responsibility of the caller. * #define values are moved into static const values in pkghash.c; a new `stride` value is also extracted (but remains set at 1). * Division and modulus operators are removed from the normal find and add paths if possible. We store the upper limit of the number of elements in the hash so we no longer need to calculate this every element addition. When doing wraparound position calculations, we only apply the modulus operator if the value is greater than the number of buckets. Signed-off-by: Dan McGee <dan@archlinux.org>
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