From 05156442c3e020456047534d6ed5b02c92628837 Mon Sep 17 00:00:00 2001
From: Simon Gardling <titaniumtown@proton.me>
Date: Thu, 13 Mar 2025 15:43:13 -0400
Subject: [PATCH] add comment about loop unrolling

---
 src/repr/board.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/repr/board.rs b/src/repr/board.rs
index 6153438..0dcfc1d 100644
--- a/src/repr/board.rs
+++ b/src/repr/board.rs
@@ -291,6 +291,8 @@ impl Board {
                 let mut temp_flips = BitBoard::new();
 
                 // Expand in direction until edge or non-opponent piece
+                // PERF! tested unrolling this loop using `const_for`
+                // resulted in a 9% slowdown
                 loop {
                     current = $dir(&current, 1);
                     if current.is_empty() || !current.intersects(*opponent_board) {