X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitbase.cpp;h=0f274c8aeb82a7d1d7ab0ddf3cfc6833d6f7b570;hp=dbda28e0019cf9e161b826cd4130307f2db6cb97;hb=d3091971b789b4be4c56fdf608eae33c5c54bbd4;hpb=a646f74e6a62af756b2e51756a81ee983db4ff34

diff --git a/src/bitbase.cpp b/src/bitbase.cpp
index dbda28e0..0f274c8a 100644
--- a/src/bitbase.cpp
+++ b/src/bitbase.cpp
@@ -26,10 +26,10 @@
 namespace {
 
   // There are 24 possible pawn squares: the first 4 files and ranks from 2 to 7
-  const unsigned IndexMax = 2*24*64*64; // stm * psq * wksq * bksq = 196608
+  const unsigned MAX_INDEX = 2*24*64*64; // stm * psq * wksq * bksq = 196608
 
   // Each uint32_t stores results of 32 positions, one per bit
-  uint32_t KPKBitbase[IndexMax / 32];
+  uint32_t KPKBitbase[MAX_INDEX / 32];
 
   // A KPK bitbase index is an integer in [0, IndexMax] range
   //
@@ -84,20 +84,20 @@ void Bitbases::init_kpk() {
 
   unsigned idx, repeat = 1;
   std::vector<KPKPosition> db;
-  db.reserve(IndexMax);
+  db.reserve(MAX_INDEX);
 
   // Initialize db with known win / draw positions
-  for (idx = 0; idx < IndexMax; ++idx)
+  for (idx = 0; idx < MAX_INDEX; ++idx)
       db.push_back(KPKPosition(idx));
 
   // Iterate through the positions until none of the unknown positions can be
   // changed to either wins or draws (15 cycles needed).
   while (repeat)
-      for (repeat = idx = 0; idx < IndexMax; ++idx)
+      for (repeat = idx = 0; idx < MAX_INDEX; ++idx)
           repeat |= (db[idx] == UNKNOWN && db[idx].classify(db) != UNKNOWN);
 
   // Map 32 results into one KPKBitbase[] entry
-  for (idx = 0; idx < IndexMax; ++idx)
+  for (idx = 0; idx < MAX_INDEX; ++idx)
       if (db[idx] == WIN)
           KPKBitbase[idx / 32] |= 1 << (idx & 0x1F);
 }
@@ -107,14 +107,16 @@ namespace {
 
   KPKPosition::KPKPosition(unsigned idx) {
 
-    wksq = Square((idx >>  0) & 0x3F);
-    bksq = Square((idx >>  6) & 0x3F);
-    us   = Color ((idx >> 12) & 0x01);
-    psq  = File  ((idx >> 13) & 0x03) | Rank(RANK_7 - (idx >> 15));
-    result  = UNKNOWN;
+    wksq   = Square((idx >>  0) & 0x3F);
+    bksq   = Square((idx >>  6) & 0x3F);
+    us     = Color ((idx >> 12) & 0x01);
+    psq    = make_square(File((idx >> 13) & 0x3), RANK_7 - Rank((idx >> 15) & 0x7));
+    result = UNKNOWN;
 
     // Check if two pieces are on the same square or if a king can be captured
-    if (   square_distance(wksq, bksq) <= 1 || wksq == psq || bksq == psq
+    if (   square_distance(wksq, bksq) <= 1
+        || wksq == psq
+        || bksq == psq
         || (us == WHITE && (StepAttacksBB[PAWN][psq] & bksq)))
         result = INVALID;