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Combine CCoinsViewCache's HaveCoins and const GetCoins into AccessCoins.

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The efficient version of CCoinsViewCache::GetCoins only works for known-to-exist
cache entries, requiring a separate HaveCoins call beforehand. This is
inefficient as both perform a hashtable lookup.

Replace the non-mutable GetCoins with AccessCoins, which returns a potentially-NULL
pointer. This also decreases the overloading of GetCoins.

Also replace some copying (inefficient) GetCoins calls with equivalent AccessCoins,
decreasing the copying.
This commit is contained in:
Pieter Wuille
2014-09-02 21:21:15 +02:00
parent b8d92236f6
commit 629d75faac
7 changed files with 54 additions and 51 deletions
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7
src/miner.cpp
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@@ -167,12 +167,13 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
nTotalIn += mempool.mapTx[txin.prevout.hash].GetTx().vout[txin.prevout.n].nValue;
continue;
}
const CCoins &coins = view.GetCoins(txin.prevout.hash);
const CCoins* coins = view.AccessCoins(txin.prevout.hash);
assert(coins);
int64_t nValueIn = coins.vout[txin.prevout.n].nValue;
int64_t nValueIn = coins->vout[txin.prevout.n].nValue;
nTotalIn += nValueIn;
int nConf = pindexPrev->nHeight - coins.nHeight + 1;
int nConf = pindexPrev->nHeight - coins->nHeight + 1;
dPriority += (double)nValueIn * nConf;
}