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After building the heap, the code continuously pops two elements from the heap until only 2 or 3 elements remain, at which point it switches back to a regular heapsort with one element popped at a time. However, to handle the final 2 or 3 elements, an additional else-if statement in the while loop was introduced, potentially increasing branch misses. Moreover, when there are only 2 or 3 elements left, continuing with regular heapify operations is unnecessary as these cases are simple enough to be handled with a single comparison and 1 or 2 swaps outside the while loop. Eliminating the additional else-if statement and directly managing cases involving 2 or 3 elements outside the loop reduces unnecessary conditional branches resulting from the numerous loops and conditionals in heapify. This optimization maintains consistent numbers of comparisons and swaps for arrays with even lengths while reducing swaps and comparisons for arrays with odd lengths from 2.5 swaps and 1 comparison to 1.5 swaps and 1 comparison. Link: https://lkml.kernel.org/r/20240527203011.1644280-4-visitorckw@gmail.com Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com> Cc: Ching-Chun (Jim) Huang <jserv@ccns.ncku.edu.tw> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.