5 Commits

Author	SHA1	Message	Date
Christopher Haster	46e22b2a38	Adopted lfs_ctz_index implementation using popcount ... This reduces the O(n^2logn) runtime to read a file to only O(nlog). The extra O(n) did not touch the disk, so it isn't a problem until the files become very large, but this solution comes with very little cost. Long story short, you can find the block index + offset pair for a CTZ linked-list with this series of formulas: n' = floor(N / (B - 2w/8)) N' = (B - 2w/8)n' + (w/8)popcount(n') off' = N - N' n, off = n'-1, off'+B if off' < 0 n', off'+(w/8)(ctz(n')+1) if off' >= 0 For the long story, you will need to see the updated DESIGN.md	2017-10-18 00:44:30 -05:00
Christopher Haster	454b588f73	Updated SPEC.md and DESIGN.md based on recent changes ... - Added math behind CTZ limits - Added documentation over atomic moves	2017-10-12 20:31:33 -05:00
Christopher Haster	476915fee6	Removed a few "what"s from the documentation	2017-07-16 12:41:47 -05:00
Christopher Haster	0d66f9f991	Cleaned up design documentation	2017-06-28 15:50:29 -05:00
Christopher Haster	d2bf2bbc72	Added documentation over the underlying design	2017-05-18 23:44:18 -05:00