path: root/tools
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authorRich Felker <>2011-04-27 13:27:04 -0400
committerRich Felker <>2011-04-27 13:27:04 -0400
commit22263709eda9f7d692a0f484fd759f757418dbd7 (patch)
tree0a801dc54d32eb32e5104377909da1283cdea72c /tools
parent4bb9b4f3b4a6794da3091f58acbd938ff66fc15b (diff)
replace heap sort with smoothsort implementation by Valentin Ochs
Smoothsort is an adaptive variant of heapsort. This version was written by Valentin Ochs (apo) specifically for inclusion in musl. I worked with him to get it working in O(1) memory usage even with giant array element widths, and to optimize it heavily for size and speed. It's still roughly 4 times as large as the old heap sort implementation, but roughly 20 times faster given an almost-sorted array of 1M elements (20 being the base-2 log of 1M), i.e. it really does reduce O(n log n) to O(n) in the mostly-sorted case. It's still somewhat slower than glibc's Introsort for random input, but now considerably faster than glibc when the input is already sorted, or mostly sorted.
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