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chriseth
2020-09-14 17:35:04 +02:00
parent f264f5474d
commit 8e39110a30
46 changed files with 487 additions and 265 deletions
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libyul/optimiser/ExpressionSimplifier.cpp
+1 -14
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@@ -22,12 +22,9 @@
#include <libyul/optimiser/ExpressionSimplifier.h>
#include <libyul/optimiser/SimplificationRules.h>
#include <libyul/optimiser/Semantics.h>
#include <libyul/optimiser/OptimiserStep.h>
#include <libyul/AsmData.h>
#include <libsolutil/CommonData.h>
using namespace std;
using namespace solidity;
using namespace solidity::yul;
@@ -40,17 +37,7 @@ void ExpressionSimplifier::run(OptimiserStepContext& _context, Block& _ast)
void ExpressionSimplifier::visit(Expression& _expression)
{
ASTModifier::visit(_expression);
while (auto match = SimplificationRules::findFirstMatch(_expression, m_dialect, m_value))
{
// Do not apply the rule if it removes non-constant parts of the expression.
// TODO: The check could actually be less strict than "movable".
// We only require "Does not cause side-effects".
// Note: References to variables that are only assigned once are always movable,
// so if the value of the variable is not movable, the expression that references
// the variable still is.
if (match->removesNonConstants && !SideEffectsCollector(m_dialect, _expression).movable())
return;
while (auto const* match = SimplificationRules::findFirstMatch(_expression, m_dialect, m_value))
_expression = match->action().toExpression(locationOf(_expression));
}
}