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Merge pull request #5677 from ethereum/someOpts

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Some optimisations.
This commit is contained in:
chriseth 2018-12-18 18:23:16 +01:00 committed by GitHub
commit 34be592e53
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 21 additions and 12 deletions
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25
libevmasm/AssemblyItem.h
View File

@ -57,22 +57,26 @@ class AssemblyItem
public:
enum class JumpType { Ordinary, IntoFunction, OutOfFunction };
AssemblyItem(u256 _push, langutil::SourceLocation const& _location = langutil::SourceLocation()):
AssemblyItem(Push, _push, _location) { }
AssemblyItem(solidity::Instruction _i, langutil::SourceLocation const& _location = langutil::SourceLocation()):
AssemblyItem(u256 _push, langutil::SourceLocation _location = langutil::SourceLocation()):
AssemblyItem(Push, std::move(_push), std::move(_location)) { }
AssemblyItem(solidity::Instruction _i, langutil::SourceLocation _location = langutil::SourceLocation()):
m_type(Operation),
m_instruction(_i),
m_location(_location)
m_location(std::move(_location))
{}
AssemblyItem(AssemblyItemType _type, u256 _data = 0, langutil::SourceLocation const& _location = langutil::SourceLocation()):
AssemblyItem(AssemblyItemType _type, u256 _data = 0, langutil::SourceLocation _location = langutil::SourceLocation()):
m_type(_type),
m_location(_location)
m_location(std::move(_location))
{
if (m_type == Operation)
m_instruction = Instruction(uint8_t(_data));
else
m_data = std::make_shared<u256>(_data);
m_data = std::make_shared<u256>(std::move(_data));
}
AssemblyItem(AssemblyItem const&) = default;
AssemblyItem(AssemblyItem&&) = default;
AssemblyItem& operator=(AssemblyItem const&) = default;
AssemblyItem& operator=(AssemblyItem&&) = default;
AssemblyItem tag() const { assertThrow(m_type == PushTag || m_type == Tag, Exception, ""); return AssemblyItem(Tag, data()); }
AssemblyItem pushTag() const { assertThrow(m_type == PushTag || m_type == Tag, Exception, ""); return AssemblyItem(PushTag, data()); }
@ -114,6 +118,13 @@ public:
return data() < _other.data();
}
/// Shortcut that avoids constructing an AssemblyItem just to perform the comparison.
bool operator==(Instruction _instr) const
{
return type() == Operation && instruction() == _instr;
}
bool operator!=(Instruction _instr) const { return !operator==(_instr); }
/// @returns an upper bound for the number of bytes required by this item, assuming that
/// the value of a jump tag takes @a _addressLength bytes.
unsigned bytesRequired(unsigned _addressLength) const;

6
libevmasm/PeepholeOptimiser.cpp
View File

@ -160,8 +160,7 @@ struct CommutativeSwap: SimplePeepholeOptimizerMethod<CommutativeSwap, 2>
{
// Remove SWAP1 if following instruction is commutative
if (
_swap.type() == Operation &&
_swap.instruction() == Instruction::SWAP1 &&
_swap == Instruction::SWAP1 &&
SemanticInformation::isCommutativeOperation(_op)
)
{
@ -185,8 +184,7 @@ struct SwapComparison: SimplePeepholeOptimizerMethod<SwapComparison, 2>
};
if (
_swap.type() == Operation &&
_swap.instruction() == Instruction::SWAP1 &&
_swap == Instruction::SWAP1 &&
_op.type() == Operation &&
swappableOps.count(_op.instruction())
)

2
libevmasm/SemanticInformation.cpp
View File

@ -108,7 +108,7 @@ bool SemanticInformation::isSwapInstruction(AssemblyItem const& _item)
bool SemanticInformation::isJumpInstruction(AssemblyItem const& _item)
{
return _item == AssemblyItem(Instruction::JUMP) || _item == AssemblyItem(Instruction::JUMPI);
return _item == Instruction::JUMP || _item == Instruction::JUMPI;
}
bool SemanticInformation::altersControlFlow(AssemblyItem const& _item)