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Extended LoopInvariantCodeMotion for storage and state

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This commit is contained in:
Harikrishnan Mulackal
2020-08-19 12:41:29 +02:00
parent 3cbe65e4f3
commit 5c6e7f03b4
4 changed files with 68 additions and 7 deletions
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libyul/optimiser/Semantics.h
+38
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@@ -54,11 +54,48 @@ public:
Block const& _ast,
std::map<YulString, SideEffects> const* _functionSideEffects = nullptr
);
SideEffectsCollector(
Dialect const& _dialect,
ForLoop const& _ast,
std::map<YulString, SideEffects> const* _functionSideEffects = nullptr
);
using ASTWalker::operator();
void operator()(FunctionCall const& _functionCall) override;
bool movable() const { return m_sideEffects.movable; }
bool movableRelativeTo(SideEffects const& _other, bool _codeContainsMSize)
{
if (!m_sideEffects.cannotLoop)
return false;
if (m_sideEffects.movable)
return true;
if (
!m_sideEffects.movableApartFromEffects ||
m_sideEffects.storage == SideEffects::Write ||
m_sideEffects.otherState == SideEffects::Write ||
m_sideEffects.memory == SideEffects::Write
)
return false;
if (m_sideEffects.otherState == SideEffects::Read)
if (_other.otherState == SideEffects::Write)
return false;
if (m_sideEffects.storage == SideEffects::Read)
if (_other.storage == SideEffects::Write)
return false;
if (m_sideEffects.memory == SideEffects::Read)
if (_codeContainsMSize || _other.memory == SideEffects::Write)
return false;
return true;
}
bool canBeRemoved(bool _allowMSizeModification = false) const
{
if (_allowMSizeModification)
@@ -70,6 +107,7 @@ public:
bool invalidatesStorage() const { return m_sideEffects.storage == SideEffects::Write; }
bool invalidatesMemory() const { return m_sideEffects.memory == SideEffects::Write; }
SideEffects sideEffects() { return m_sideEffects; }
private:
Dialect const& m_dialect;