Greatly speedup has_mate_threat()

[stockfish] / src / piece.cpp

diff --git a/src/piece.cpp b/src/piece.cpp
index 382ed6456312604c73e2ceea1f9ad40b37c9776e..40babba695165c8ac7630f1e9b0c0222746308ea 100644 (file)
--- a/src/piece.cpp
+++ b/src/piece.cpp
@@ -35,8 +35,8 @@
 
 static const char PieceChars[] = " pnbrqk";
 
-int piece_type_to_char(PieceType pt, bool upcase) {
-  return upcase? toupper(PieceChars[pt]) : PieceChars[pt];
+char piece_type_to_char(PieceType pt, bool upcase) {
+  return char(upcase? toupper(PieceChars[pt]) : PieceChars[pt]);
 }
 
 PieceType piece_type_from_char(char c) {