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Optimize across MLOAD if MSIZE is not used.

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chriseth
2018-04-03 14:34:32 +02:00
parent d21382157c
commit 6777f7a57f
10 changed files with 87 additions and 35 deletions
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libevmasm/SemanticInformation.cpp
+6 -1
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@@ -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)