From 74973416aa6a7b0fae9ed2b9911fa18fe87c4e1c Mon Sep 17 00:00:00 2001
From: eug-vs <eugene@eug-vs.xyz>
Date: Sat, 21 Jan 2023 18:24:52 +0300
Subject: feat: precompute first rank attacks

---
 src/bitboard.rs | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/bitboard.rs')

diff --git a/src/bitboard.rs b/src/bitboard.rs
index 6481863..646006c 100644
--- a/src/bitboard.rs
+++ b/src/bitboard.rs
@@ -24,6 +24,9 @@ pub fn pop_count(bb: Bitboard) -> u8 {
 
 /// Return Bitboard with only Least Single Bit
 pub fn ls1b(bb: Bitboard) -> u64 {
+    if bb == 0 {
+        return 0
+    }
     bb & !(bb - 1)
 }
 
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