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Slightly optimize ApproximateBestSubset and its usage for PS txes (#3184)
* From 2 best sets with the same `nTotal` in ApproximateBestSubset prefer the one with less inputs * There is no reason to run ApproximateBestSubset again if nMinChange is 0 * Apply review suggestions
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@ -2570,6 +2570,7 @@ static void ApproximateBestSubset(std::vector<std::pair<CAmount, std::pair<const
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vfBest.assign(vValue.size(), true);
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nBest = nTotalLower;
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int nBestInputCount = 0;
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if (!llmq::IsOldInstantSendEnabled()) {
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// The new system does not require special handling for InstantSend as this is all done in CInstantSendManager.
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@ -2583,6 +2584,7 @@ static void ApproximateBestSubset(std::vector<std::pair<CAmount, std::pair<const
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{
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vfIncluded.assign(vValue.size(), false);
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CAmount nTotal = 0;
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int nTotalInputCount = 0;
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bool fReachedTarget = false;
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for (int nPass = 0; nPass < 2 && !fReachedTarget; nPass++)
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{
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@ -2600,16 +2602,19 @@ static void ApproximateBestSubset(std::vector<std::pair<CAmount, std::pair<const
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if (nPass == 0 ? insecure_rand.rand32()&1 : !vfIncluded[i])
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{
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nTotal += vValue[i].first;
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++nTotalInputCount;
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vfIncluded[i] = true;
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if (nTotal >= nTargetValue)
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{
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fReachedTarget = true;
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if (nTotal < nBest)
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if (nTotal < nBest || (nTotal == nBest && nTotalInputCount < nBestInputCount))
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{
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nBest = nTotal;
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nBestInputCount = nTotalInputCount;
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vfBest = vfIncluded;
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}
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nTotal -= vValue[i].first;
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--nTotalInputCount;
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vfIncluded[i] = false;
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}
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}
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@ -2774,7 +2779,7 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, const int nConfMin
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CAmount nBest;
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ApproximateBestSubset(vValue, nTotalLower, nTargetValue, vfBest, nBest, fUseInstantSend);
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if (nBest != nTargetValue && nTotalLower >= nTargetValue + nMinChange)
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if (nBest != nTargetValue && nMinChange != 0 && nTotalLower >= nTargetValue + nMinChange)
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ApproximateBestSubset(vValue, nTotalLower, nTargetValue + nMinChange, vfBest, nBest, fUseInstantSend);
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// If we have a bigger coin and (either the stochastic approximation didn't find a good solution,
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