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Avoid *begin always being included in the sorted list regardless of its value.

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This was a minor criticism by @zamar in the original pull request
https://github.com/official-stockfish/Stockfish/pull/1065
necessitating a comment explanation.

No functional change.

Closes #1091
This commit is contained in:
mstembera 2017-05-07 20:14:23 -07:00 • committed by Joona Kiiski
parent 8b15961349
commit 321a27fbe3
1 changed files with 4 additions and 6 deletions
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10
src/movepick.cpp
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@ -36,18 +36,16 @@ namespace {
// partial_insertion_sort() sorts moves in descending order up to and including
// a given limit. The order of moves smaller than the limit is left unspecified.
// To keep the implementation simple, *begin is always included in the sorted moves.
void partial_insertion_sort(ExtMove* begin, ExtMove* end, int limit) {
for (ExtMove *sortedEnd = begin + 1, *p = begin + 1; p < end; ++p)
for (ExtMove *sortedEnd = begin, *p = begin + 1; p < end; ++p)
if (p->value >= limit)
{
ExtMove tmp = *p, *q;
*p = *sortedEnd;
for (q = sortedEnd; q != begin && *(q-1) < tmp; --q)
*q = *(q-1);
*p = *++sortedEnd;
for (q = sortedEnd; q != begin && *(q - 1) < tmp; --q)
*q = *(q - 1);
*q = tmp;
++sortedEnd;
}
}