From 0d4cb48ef1b916679d9fad9f247a297c85c7fedf Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Sun, 19 Jun 2016 01:31:52 -0700
Subject: [PATCH] Use vTxHashes to optimize InitData significantly

---
 src/blockencodings.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/blockencodings.cpp b/src/blockencodings.cpp
index 204de45c29..9a0805e400 100644
--- a/src/blockencodings.cpp
+++ b/src/blockencodings.cpp
@@ -99,11 +99,13 @@ ReadStatus PartiallyDownloadedBlock::InitData(const CBlockHeaderAndShortTxIDs& c
 
     std::vector<bool> have_txn(txn_available.size());
     LOCK(pool->cs);
-    for (CTxMemPool::txiter it = pool->mapTx.begin(); it != pool->mapTx.end(); it++) {
-        std::unordered_map<uint64_t, uint16_t>::iterator idit = shorttxids.find(cmpctblock.GetShortID(it->GetTx().GetHash()));
+    const std::vector<std::pair<uint256, CTxMemPool::txiter> >& vTxHashes = pool->vTxHashes;
+    for (size_t i = 0; i < vTxHashes.size(); i++) {
+        uint64_t shortid = cmpctblock.GetShortID(vTxHashes[i].first);
+        std::unordered_map<uint64_t, uint16_t>::iterator idit = shorttxids.find(shortid);
         if (idit != shorttxids.end()) {
             if (!have_txn[idit->second]) {
-                txn_available[idit->second] = it->GetSharedTx();
+                txn_available[idit->second] = vTxHashes[i].second->GetSharedTx();
                 have_txn[idit->second]  = true;
                 mempool_count++;
             } else {