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Merge #9572: Skip witness sighash cache for non-segwit transactions

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0da49b5 Skip precompute sighash for transactions without witness (Johnson Lau)

Pull request description:

  This saves unnecessary hash caching for non-segwit transactions, but I am not sure if the difference is noticeable.

Tree-SHA512: 5cd733a729a52a45781510b3572b26e76837a94155caa14311c6d23a27a12e9613ff278dfc2592e21f640202782f22c5ad00fca85c4de5efacaa617c48ccb08d
This commit is contained in:
Wladimir J. van der Laan 2017-10-05 19:39:24 +02:00
commit 17f2acedbe
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GPG Key ID: 1E4AED62986CD25D
2 changed files with 12 additions and 6 deletions
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17
src/script/interpreter.cpp
View File

@ -1168,9 +1168,13 @@ uint256 GetOutputsHash(const CTransaction& txTo) {
PrecomputedTransactionData::PrecomputedTransactionData(const CTransaction& txTo)
{
hashPrevouts = GetPrevoutHash(txTo);
hashSequence = GetSequenceHash(txTo);
hashOutputs = GetOutputsHash(txTo);
// Cache is calculated only for transactions with witness
if (txTo.HasWitness()) {
hashPrevouts = GetPrevoutHash(txTo);
hashSequence = GetSequenceHash(txTo);
hashOutputs = GetOutputsHash(txTo);
ready = true;
}
}
uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache)
@ -1181,18 +1185,19 @@ uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsig
uint256 hashPrevouts;
uint256 hashSequence;
uint256 hashOutputs;
const bool cacheready = cache && cache->ready;
if (!(nHashType & SIGHASH_ANYONECANPAY)) {
hashPrevouts = cache ? cache->hashPrevouts : GetPrevoutHash(txTo);
hashPrevouts = cacheready ? cache->hashPrevouts : GetPrevoutHash(txTo);
}
if (!(nHashType & SIGHASH_ANYONECANPAY) && (nHashType & 0x1f) != SIGHASH_SINGLE && (nHashType & 0x1f) != SIGHASH_NONE) {
hashSequence = cache ? cache->hashSequence : GetSequenceHash(txTo);
hashSequence = cacheready ? cache->hashSequence : GetSequenceHash(txTo);
}
if ((nHashType & 0x1f) != SIGHASH_SINGLE && (nHashType & 0x1f) != SIGHASH_NONE) {
hashOutputs = cache ? cache->hashOutputs : GetOutputsHash(txTo);
hashOutputs = cacheready ? cache->hashOutputs : GetOutputsHash(txTo);
} else if ((nHashType & 0x1f) == SIGHASH_SINGLE && nIn < txTo.vout.size()) {
CHashWriter ss(SER_GETHASH, 0);
ss << txTo.vout[nIn];

1
src/script/interpreter.h
View File

@ -113,6 +113,7 @@ bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned i
struct PrecomputedTransactionData
{
uint256 hashPrevouts, hashSequence, hashOutputs;
bool ready = false;
explicit PrecomputedTransactionData(const CTransaction& tx);
};