From 1657c4bc495815febc2137972c3c63b99d2b0189 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Thu, 28 Mar 2013 23:51:50 +0100
Subject: Use a uint256 for bnChainWork

Every block index entry currently requires a separately-allocated
CBigNum. By replacing them with uint256, it's just 32 bytes extra
in CBlockIndex itself.

This should save us a few megabytes in RAM, and less allocation
overhead.
---
 src/main.h | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

(limited to 'src/main.h')

diff --git a/src/main.h b/src/main.h
index 9a3664a437..24b2cb2aa6 100644
--- a/src/main.h
+++ b/src/main.h
@@ -77,8 +77,8 @@ extern std::set<CBlockIndex*, CBlockIndexWorkComparator> setBlockIndexValid;
 extern uint256 hashGenesisBlock;
 extern CBlockIndex* pindexGenesisBlock;
 extern int nBestHeight;
-extern CBigNum bnBestChainWork;
-extern CBigNum bnBestInvalidWork;
+extern uint256 nBestChainWork;
+extern uint256 nBestInvalidWork;
 extern uint256 hashBestChain;
 extern CBlockIndex* pindexBest;
 extern unsigned int nTransactionsUpdated;
@@ -1619,7 +1619,7 @@ public:
     unsigned int nUndoPos;
 
     // (memory only) Total amount of work (expected number of hashes) in the chain up to and including this block
-    CBigNum bnChainWork;
+    uint256 nChainWork;
 
     // Number of transactions in this block.
     // Note: in a potential headers-first mode, this number cannot be relied upon
@@ -1648,7 +1648,7 @@ public:
         nFile = 0;
         nDataPos = 0;
         nUndoPos = 0;
-        bnChainWork = 0;
+        nChainWork = 0;
         nTx = 0;
         nChainTx = 0;
         nStatus = 0;
@@ -1669,7 +1669,7 @@ public:
         nFile = 0;
         nDataPos = 0;
         nUndoPos = 0;
-        bnChainWork = 0;
+        nChainWork = 0;
         nTx = 0;
         nChainTx = 0;
         nStatus = 0;
@@ -1793,8 +1793,8 @@ public:
 struct CBlockIndexWorkComparator
 {
     bool operator()(CBlockIndex *pa, CBlockIndex *pb) {
-        if (pa->bnChainWork > pb->bnChainWork) return false;
-        if (pa->bnChainWork < pb->bnChainWork) return true;
+        if (pa->nChainWork > pb->nChainWork) return false;
+        if (pa->nChainWork < pb->nChainWork) return true;
 
         if (pa->GetBlockHash() < pb->GetBlockHash()) return false;
         if (pa->GetBlockHash() > pb->GetBlockHash()) return true;
-- 
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