From 63d2800fabe4393382f699ba1e41260ab7b01727 Mon Sep 17 00:00:00 2001
From: Anthony Towns <aj@erisian.com.au>
Date: Thu, 4 Feb 2021 12:25:25 +1000
Subject: bip 8: simplify MUST_SIGNAL check

---
 bip-0008.mediawiki | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'bip-0008.mediawiki')

diff --git a/bip-0008.mediawiki b/bip-0008.mediawiki
index d5cb191..8800b43 100644
--- a/bip-0008.mediawiki
+++ b/bip-0008.mediawiki
@@ -181,16 +181,16 @@ Blocks received while in the MUST_SIGNAL phase must be checked to ensure that th
 
     if (GetStateForBlock(block) == MUST_SIGNAL) {
         int nonsignal = 0;
-        int count = 1 + (block.nHeight % 2016);
         walk = block;
-        while (count > 0) {
-            --count;
+        while (true) {
             if ((walk.nVersion & 0xE0000000) != 0x20000000 || ((walk.nVersion >> bit) & 1) != 1) {
                 ++nonsignal;
-                if (nonsignal + threshold > 2016) {
+                if (nonsignal > 2016 - threshold) {
                     return state.Invalid(BlockValidationResult::RECENT_CONSENSUS_CHANGE, "bad-version-bip8-must-signal");
                 }
-            } else if (nonsignal == 0) {
+            }
+            if (walk.nHeight % 2016 == 0) {
+                // checked every block in this retarget period
                 break;
             }
             walk = walk.parent;
-- 
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