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rstl::sort is just a few regswaps away

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Henrique Gemignani Passos Lima 2022-11-28 02:40:31 +02:00
parent 5af3c20f3c
commit ef221d5c96
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1 changed files with 9 additions and 11 deletions
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20
include/rstl/algorithm.hpp
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@ -72,23 +72,21 @@ void sort(It first, It last, Cmp cmp) {
if (count <= 20) { if (count <= 20) {
__insertion_sort(first, last, cmp); __insertion_sort(first, last, cmp);
} else { } else {
It beforeLast = last - 1; It end = last;
It middle = first + count / 2; __sort3(*first, *(first + count / 2), *--end, cmp);
__sort3(*first, *middle, *(last - 1), cmp); typename iterator_traits< It >::value_type value = *(first + count / 2);
typename iterator_traits< It >::value_type value = *middle;
It it = first + 1; It it = first + 1;
--end;
while (true) { while (true) {
while (cmp(*it, value)) while (cmp(*it, value))
++it; ++it;
while (cmp(value, *beforeLast)) while (cmp(value, *end))
--beforeLast; --end;
if (it >= beforeLast) if (it >= end)
break; break;
iter_swap(beforeLast, it); // wrong order? iter_swap(it, end);
++it; ++it;
--beforeLast; --end;
} }
sort(first, it, cmp); sort(first, it, cmp);
sort(it, last, cmp); sort(it, last, cmp);