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| author | chriseth <chris@ethereum.org> | 2018-03-09 02:41:29 +0800 |
|---|---|---|
| committer | chriseth <chris@ethereum.org> | 2018-04-03 20:34:32 +0800 |
| commit | 6777f7a57fed6b39128773f13084da729dd64588 (patch) | |
| tree | 87b74e6f8e3f12eec98ca6b2265b23cf1e9f3a71 /libevmasm/SemanticInformation.cpp | |
| parent | d21382157cbda53d98f3a4e0d7c0d0a7d213aebf (diff) | |
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Optimize across MLOAD if MSIZE is not used.
Diffstat (limited to 'libevmasm/SemanticInformation.cpp')
| -rw-r--r-- | libevmasm/SemanticInformation.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libevmasm/SemanticInformation.cpp b/libevmasm/SemanticInformation.cpp index 03870f7c..71267ee8 100644 --- a/libevmasm/SemanticInformation.cpp +++ b/libevmasm/SemanticInformation.cpp @@ -28,7 +28,7 @@ using namespace std; using namespace dev; using namespace dev::eth; -bool SemanticInformation::breaksCSEAnalysisBlock(AssemblyItem const& _item) +bool SemanticInformation::breaksCSEAnalysisBlock(AssemblyItem const& _item, bool _msizeImportant) { switch (_item.type()) { @@ -59,6 +59,11 @@ bool SemanticInformation::breaksCSEAnalysisBlock(AssemblyItem const& _item) return false; if (_item.instruction() == Instruction::MSTORE) return false; + if (!_msizeImportant && ( + _item.instruction() == Instruction::MLOAD || + _item.instruction() == Instruction::KECCAK256 + )) + return false; //@todo: We do not handle the following memory instructions for now: // calldatacopy, codecopy, extcodecopy, mstore8, // msize (note that msize also depends on memory read access) |