From 2640f91e36558650bb988dcc82b5148ee71f3eb0 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Tue, 18 Aug 2026 22:22:27 -0700
Subject: optimize with settlement counter

---
 src/sim/cell/cell.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/sim/cell/cell.rs')

diff --git a/src/sim/cell/cell.rs b/src/sim/cell/cell.rs
index d567893..edb2402 100644
--- a/src/sim/cell/cell.rs
+++ b/src/sim/cell/cell.rs
@@ -10,6 +10,7 @@ pub struct Cell {
 impl Cell {
     const FLAG_PARITY: u8 = 0b0000_0001;
     const FLAG_RB: u8 = 0b0000_0010;
+    const MASK_SETTLED: u8 = 0b0001_1100;
 
     #[inline]
     pub fn parity(self) -> u8 {
@@ -33,6 +34,7 @@ impl Cell {
     pub fn rb(self) -> bool {
         (self.flags & Self::FLAG_RB) == Self::FLAG_RB
     }
+    #[inline]
     pub fn set_rb(&mut self, rb: bool) {
         if rb {
             self.flags |= Self::FLAG_RB
@@ -40,6 +42,28 @@ impl Cell {
             self.flags = self.flags & !Self::FLAG_RB
         }
     }
+
+    #[inline]
+    pub fn settled(self) -> u8 {
+        (self.flags & Self::MASK_SETTLED) >> 2
+    }
+    #[inline]
+    fn set_settled(&mut self, settled: u8) {
+        debug_assert!(settled <= 7);
+        self.flags = (settled << 2) | (self.flags & !Self::MASK_SETTLED);
+    }
+    #[inline]
+    pub fn reset_settled(&mut self) {
+        self.flags &= !Self::MASK_SETTLED;
+    }
+
+    #[inline]
+    pub fn increment_settled(&mut self) {
+        let s = self.settled();
+        if s < 7 {
+            self.set_settled(s + 1);
+        }
+    }
 }
 
 impl Cell {
-- 
cgit v1.3.1