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Optimizer: generate code starting with empty state

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This commit is contained in:
chriseth 2016-10-21 17:33:30 +02:00
parent 3e13e59ff9
commit ba42c6e447
2 changed files with 5 additions and 2 deletions
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1
Changelog.md
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@ -9,6 +9,7 @@ Features:
* Support shifting constant numbers.
Bugfixes:
* Optimizer: fix related to stale knowledge about SHA3 operations
* Disallow unknown options in ``solc``.
* Proper type checking for bound functions.
* Code Generator: expect zero stack increase after `super` as an expression.

6
libevmasm/Assembly.cpp
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@ -327,8 +327,10 @@ Assembly& Assembly::optimise(bool _enable, bool _isCreation, size_t _runs)
AssemblyItems optimisedItems;
for (BasicBlock const& block: cfg.optimisedBlocks())
{
assertThrow(!!block.startState, OptimizerException, "");
CommonSubexpressionEliminator eliminator(*block.startState);
// We used to start with the block's initial state but it caused
// too many inconsistencies.
KnownState emptyState;
CommonSubexpressionEliminator eliminator(emptyState);
auto iter = m_items.begin() + block.begin;
auto const end = m_items.begin() + block.end;
while (iter < end)