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lib/sort: optimize heapsort for equal elements in sift-down path

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Patch series "lib/sort: Optimize the number of swaps and comparisons".

This patch series aims to optimize the heapsort algorithm, specifically
targeting a reduction in the number of swaps and comparisons required.


This patch (of 2):

Currently, when searching for the sift-down path and encountering equal
elements, the algorithm chooses the left child.  However, considering that
the height of the right subtree may be one less than that of the left
subtree, selecting the right child in such cases can potentially reduce
the number of comparisons and swaps.

For instance, when sorting an array of 10,000 identical elements, the
current implementation requires 247,209 comparisons.  With this patch, the
number of comparisons can be reduced to 227,241.

Link: https://lkml.kernel.org/r/20240113031352.2395118-1-visitorckw@gmail.com
Link: https://lkml.kernel.org/r/20240113031352.2395118-2-visitorckw@gmail.com
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kuan-Wei Chiu 2024-01-13 11:13:51 +08:00 committed by Andrew Morton
parent 6db9d31783
commit db946a4222
1 changed files with 1 additions and 1 deletions
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2
lib/sort.c
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@ -262,7 +262,7 @@ void sort_r(void *base, size_t num, size_t size,
* average, 3/4 worst-case.)
*/
for (b = a; c = 2*b + size, (d = c + size) < n;)
b = do_cmp(base + c, base + d, cmp_func, priv) >= 0 ? c : d;
b = do_cmp(base + c, base + d, cmp_func, priv) > 0 ? c : d;
if (d == n) /* Special case last leaf with no sibling */
b = c;