**diff options**

author | Rich Felker <dalias@aerifal.cx> | 2011-04-27 13:27:04 -0400 |
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committer | Rich Felker <dalias@aerifal.cx> | 2011-04-27 13:27:04 -0400 |

commit | 22263709eda9f7d692a0f484fd759f757418dbd7 (patch) | |

tree | 0a801dc54d32eb32e5104377909da1283cdea72c /README | |

parent | 4bb9b4f3b4a6794da3091f58acbd938ff66fc15b (diff) | |

download | musl-22263709eda9f7d692a0f484fd759f757418dbd7.tar.gz |

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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