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Simplify and optimise stack rotation.

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chriseth committed 2015-11-30 18:50:47 +01:00
1 parent e9c7837c15
commit 35b310cfaf
2 files changed
+27 -8
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libsolidity/codegen/CompilerUtils.cpp
+21 -8
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@@ -695,18 +695,31 @@ void CompilerUtils::copyToStackTop(unsigned _stackDepth, unsigned _itemSize)
void CompilerUtils::moveToStackTop(unsigned _stackDepth, unsigned _itemSize)
{
solAssert(_stackDepth <= 15, "Stack too deep, try removing local variables.");
for (unsigned j = 0; j < _itemSize; ++j)
for (unsigned i = 0; i < _stackDepth + _itemSize - 1; ++i)
m_context << eth::swapInstruction(1 + i);
moveIntoStack(_itemSize, _stackDepth);
}
void CompilerUtils::moveIntoStack(unsigned _stackDepth, unsigned _itemSize)
{
solAssert(_stackDepth <= 16, "Stack too deep, try removing local variables.");
for (unsigned j = 0; j < _itemSize; ++j)
for (unsigned i = _stackDepth; i > 0; --i)
m_context << eth::swapInstruction(i + _itemSize - 1);
if (_stackDepth <= _itemSize)
for (unsigned i = 0; i < _stackDepth; ++i)
rotateStackDown(_stackDepth + _itemSize);
else
for (unsigned i = 0; i < _itemSize; ++i)
rotateStackUp(_stackDepth + _itemSize);
}
void CompilerUtils::rotateStackUp(unsigned _items)
{
solAssert(_items - 1 <= 16, "Stack too deep, try removing local variables.");
for (unsigned i = 1; i < _items; ++i)
m_context << eth::swapInstruction(_items - i);
}
void CompilerUtils::rotateStackDown(unsigned _items)
{
solAssert(_items - 1 <= 16, "Stack too deep, try removing local variables.");
for (unsigned i = 1; i < _items; ++i)
m_context << eth::swapInstruction(i);
}
void CompilerUtils::popStackElement(Type const& _type)