X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.cpp;h=7d86884d12ee51caab40e70e1b14eac56b3f019c;hp=6f1569250a7fe6681c080733c86370fc32b46f0c;hb=c52da3b806b74ba5ab5249784d39da8fec3c7465;hpb=b599da01fa008e5f274a96c948f8346991bfd050

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index 6f156925..7d86884d 100644
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -366,6 +366,29 @@ Square pop_1st_bit(Bitboard* bb) {
 
 #endif
 
+int bitScanReverse32(uint32_t b)
+{
+   int result = 0;
+
+   if (b > 0xFFFF) {
+      b >>= 16;
+      result += 16;
+   }
+   if (b > 0xFF) {
+      b >>= 8;
+      result += 8;
+   }
+   if (b > 0xF) {
+      b >>= 4;
+      result += 4;
+   }
+   if (b > 0x3) {
+      b >>= 2;
+      result += 2;
+   }
+   return result + (b > 0) + (b > 1);
+}
+
 namespace {
 
   // All functions below are used to precompute various bitboards during