~25% speedup in selfplay due to: incremental zobrist hashing, smarter road checking, re-using the input computed for the NN

1 files changed, 6 insertions, 0 deletions

diff --git a/include/zobrist.h b/include/zobrist.h
index 5fd5ace..27053a6 100644
--- a/include/zobrist.h
+++ b/include/zobrist.h
@@ -19,8 +19,14 @@
 #include <tak.h>
 #include <xorshift64.h>
 
+#define PLY_PARITY_MAGIC 0x9E3779B97F4A7C15ULL
+
 void zobrist_free(void);
 
 int zobrist_init(const uint8_t board_size);
 
+// hash for whole state
 uint64_t zobrist_compute(tak_state_p state);
+
+// hash contribution from a single board cell at location l
+uint64_t zobrist_cell(tak_state_p state, const uint8_t l);