HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-16 23:26:23 +08:00
Code Issues Packages Projects Releases Wiki Activity

Split branches in generate_piece_moves()

Browse Source 
Instead of one comparison in while() condition use two,
the first to check if the piece is exsistant and the second
to loop across pieces of that type.

This should help branch prediction in cases we have only
one piece of the same type, for instance for queens, the
first branch is always true and the second is almost always
false.

Increased speed of 0.3-0.5 % on Gcc pgo compiles.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-08-27 12:15:07 +02:00
parent 2a2353aac6
commit d9dc9dbd65
1 changed files with 6 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
src/movegen.cpp
View File

@@ -429,10 +429,13 @@ namespace {
Square from;
const Square* ptr = pos.piece_list_begin(us, Piece);
while ((from = *ptr++) != SQ_NONE)
if (*ptr != SQ_NONE)
{
b = pos.attacks_from<Piece>(from) & target;
SERIALIZE_MOVES(b);
do {
from = *ptr;
b = pos.attacks_from<Piece>(from) & target;
SERIALIZE_MOVES(b);
} while (*++ptr != SQ_NONE);
}
return mlist;
}