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Use multiprecision::msb() in GasMeter and remove FixedHash dependency

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This commit is contained in:
Alex Beregszaszi
2020-01-17 14:24:55 +01:00
committed by Daniel Kirchner
parent 3a17ca6331
commit 00f3c42d17
2 changed files with 8 additions and 19 deletions
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libevmasm/GasMeter.cpp
+8 -3
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@@ -19,8 +19,6 @@
#include <libevmasm/KnownState.h>
#include <libsolutil/FixedHash.h>
using namespace std;
using namespace solidity;
using namespace solidity::util;
@@ -182,7 +180,14 @@ GasMeter::GasConsumption GasMeter::estimateMax(AssemblyItem const& _item, bool _
case Instruction::EXP:
gas = GasCosts::expGas;
if (u256 const* value = classes.knownConstant(m_state->relativeStackElement(-1)))
gas += GasCosts::expByteGas(m_evmVersion) * (32 - (h256(*value).firstBitSet() / 8));
{
if (*value)
{
// Note: msb() counts from 0 and throws on 0 as input.
unsigned const significantByteCount = (boost::multiprecision::msb(*value) + 1 + 7) / 8;
gas += GasCosts::expByteGas(m_evmVersion) * significantByteCount;
}
}
else
gas += GasCosts::expByteGas(m_evmVersion) * 32;
break;