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Use native shift instructions on Constantinople

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This commit is contained in:
Alex Beregszaszi 2018-03-29 09:56:51 +01:00
parent 5cce2e552b
commit 22bfd3da41
3 changed files with 20 additions and 4 deletions
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1
Changelog.md
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@ -2,6 +2,7 @@
Features:
* Build System: Update internal dependency of jsoncpp to 1.8.4, which introduces more strictness and reduces memory usage.
* Code Generator: Use native shift instructions on target Constantinople.
* Optimizer: Remove unnecessary masking of the result of known short instructions (``ADDRESS``, ``CALLER``, ``ORIGIN`` and ``COINBASE``).
* Type Checker: Deprecate the ``years`` unit denomination and raise a warning for it (or an error as experimental 0.5.0 feature).
* Type Checker: Make literals (without explicit type casting) an error for tight packing as experimental 0.5.0 feature.

10
libsolidity/codegen/CompilerUtils.cpp
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@ -1265,13 +1265,19 @@ void CompilerUtils::cleanHigherOrderBits(IntegerType const& _typeOnStack)
void CompilerUtils::leftShiftNumberOnStack(unsigned _bits)
{
solAssert(_bits < 256, "");
m_context << (u256(1) << _bits) << Instruction::MUL;
if (m_context.evmVersion().hasBitwiseShifting())
m_context << _bits << Instruction::SHL;
else
m_context << (u256(1) << _bits) << Instruction::MUL;
}
void CompilerUtils::rightShiftNumberOnStack(unsigned _bits, bool _isSigned)
{
solAssert(_bits < 256, "");
m_context << (u256(1) << _bits) << Instruction::SWAP1 << (_isSigned ? Instruction::SDIV : Instruction::DIV);
if (m_context.evmVersion().hasBitwiseShifting())
m_context << _bits << (_isSigned ? Instruction::SAR : Instruction::SHR);
else
m_context << (u256(1) << _bits) << Instruction::SWAP1 << (_isSigned ? Instruction::SDIV : Instruction::DIV);
}
unsigned CompilerUtils::prepareMemoryStore(Type const& _type, bool _padToWords)

13
libsolidity/codegen/ExpressionCompiler.cpp
View File

@ -1706,13 +1706,22 @@ void ExpressionCompiler::appendShiftOperatorCode(Token::Value _operator, Type co
m_context.appendConditionalInvalid();
}
m_context << Instruction::SWAP1;
// stack: value_to_shift shift_amount
switch (_operator)
{
case Token::SHL:
m_context << Instruction::SWAP1 << u256(2) << Instruction::EXP << Instruction::MUL;
if (m_context.evmVersion().hasBitwiseShifting())
m_context << Instruction::SHL;
else
m_context << u256(2) << Instruction::EXP << Instruction::MUL;
break;
case Token::SAR:
m_context << Instruction::SWAP1 << u256(2) << Instruction::EXP << Instruction::SWAP1 << (c_valueSigned ? Instruction::SDIV : Instruction::DIV);
if (m_context.evmVersion().hasBitwiseShifting())
m_context << (c_valueSigned ? Instruction::SAR : Instruction::SHR);
else
m_context << u256(2) << Instruction::EXP << Instruction::SWAP1 << (c_valueSigned ? Instruction::SDIV : Instruction::DIV);
break;
case Token::SHR:
default: