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ethminer
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Some tweaks in gas counting

cl-refactor
Paweł Bylica 10 years ago
parent
73bf7087e7
commit
3505e832ee
2 changed files with 9 additions and 11 deletions
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  1. 5
      libevmjit/GasMeter.cpp
  2. 15
      libevmjit/Memory.cpp

5
libevmjit/GasMeter.cpp
View File

@ -183,10 +183,9 @@ void GasMeter::countSha3Data(llvm::Value* _dataLength)
assert(m_blockCost > 0); // SHA3 instruction is already counted
// TODO: This round ups to 32 happens in many places
// FIXME: 64-bit arith used, but not verified
static_assert(c_sha3WordGas != 1, "SHA3 data cost has changed. Update GasMeter");
auto dataLength64 = getBuilder().CreateTrunc(_dataLength, Type::lowPrecision);
auto words64 = m_builder.CreateUDiv(m_builder.CreateAdd(dataLength64, getBuilder().getInt64(31)), getBuilder().getInt64(32));
auto dataLength64 = getBuilder().CreateTrunc(_dataLength, Type::Gas);
auto words64 = m_builder.CreateUDiv(m_builder.CreateNUWAdd(dataLength64, getBuilder().getInt64(31)), getBuilder().getInt64(32));
auto cost64 = m_builder.CreateNUWMul(getBuilder().getInt64(c_sha3WordGas), words64);
count(cost64);
}

15
libevmjit/Memory.cpp
View File

@ -197,7 +197,8 @@ void Memory::copyBytes(llvm::Value* _srcPtr, llvm::Value* _srcSize, llvm::Value*
// Additional copy cost
// TODO: This round ups to 32 happens in many places
auto copyWords = m_builder.CreateUDiv(m_builder.CreateAdd(_reqBytes, Constant::get(31)), Constant::get(32));
auto reqBytes = m_builder.CreateTrunc(_reqBytes, Type::Gas);
auto copyWords = m_builder.CreateUDiv(m_builder.CreateNUWAdd(reqBytes, m_builder.getInt64(31)), m_builder.getInt64(32));
m_gasMeter.countCopy(copyWords);
// Algorithm:
@ -210,14 +211,12 @@ void Memory::copyBytes(llvm::Value* _srcPtr, llvm::Value* _srcSize, llvm::Value*
// bytesToCopy = select(isOutsideData, 0, bytesToCopy0)
auto isOutsideData = m_builder.CreateICmpUGE(_srcIdx, _srcSize);
auto idx64 = m_builder.CreateTrunc(_srcIdx, Type::lowPrecision);
auto size64 = m_builder.CreateTrunc(_srcSize, Type::lowPrecision);
auto idx64 = m_builder.CreateTrunc(_srcIdx, Type::Size);
auto size64 = m_builder.CreateTrunc(_srcSize, Type::Size);
auto dataLeftSize = m_builder.CreateNUWSub(size64, idx64);
auto reqBytes64 = m_builder.CreateTrunc(_reqBytes, Type::lowPrecision);
auto outOfBound = m_builder.CreateICmpUGT(reqBytes64, dataLeftSize);
auto bytesToCopyInner = m_builder.CreateSelect(outOfBound, dataLeftSize, reqBytes64);
auto zero64 = llvm::ConstantInt::get(Type::lowPrecision, 0); // TODO: Cache common constants
auto bytesToCopy = m_builder.CreateSelect(isOutsideData, zero64, bytesToCopyInner);
auto outOfBound = m_builder.CreateICmpUGT(reqBytes, dataLeftSize);
auto bytesToCopyInner = m_builder.CreateSelect(outOfBound, dataLeftSize, reqBytes);
auto bytesToCopy = m_builder.CreateSelect(isOutsideData, m_builder.getInt64(0), bytesToCopyInner);
auto src = m_builder.CreateGEP(_srcPtr, idx64, "src");
auto dstIdx = m_builder.CreateTrunc(_destMemIdx, Type::Size, "dstIdx"); // Never allow memory index be a type bigger than i64

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