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Use native shift instructions on Constantinople

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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: Features:
* Build System: Update internal dependency of jsoncpp to 1.8.4, which introduces more strictness and reduces memory usage. * 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``). * 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: 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. * Type Checker: Make literals (without explicit type casting) an error for tight packing as experimental 0.5.0 feature.

6
libsolidity/codegen/CompilerUtils.cpp
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@ -1265,12 +1265,18 @@ void CompilerUtils::cleanHigherOrderBits(IntegerType const& _typeOnStack)
void CompilerUtils::leftShiftNumberOnStack(unsigned _bits) void CompilerUtils::leftShiftNumberOnStack(unsigned _bits)
{ {
solAssert(_bits < 256, ""); solAssert(_bits < 256, "");
if (m_context.evmVersion().hasBitwiseShifting())
m_context << _bits << Instruction::SHL;
else
m_context << (u256(1) << _bits) << Instruction::MUL; m_context << (u256(1) << _bits) << Instruction::MUL;
} }
void CompilerUtils::rightShiftNumberOnStack(unsigned _bits, bool _isSigned) void CompilerUtils::rightShiftNumberOnStack(unsigned _bits, bool _isSigned)
{ {
solAssert(_bits < 256, ""); solAssert(_bits < 256, "");
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); m_context << (u256(1) << _bits) << Instruction::SWAP1 << (_isSigned ? Instruction::SDIV : Instruction::DIV);
} }

13
libsolidity/codegen/ExpressionCompiler.cpp
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@ -1706,13 +1706,22 @@ void ExpressionCompiler::appendShiftOperatorCode(Token::Value _operator, Type co
m_context.appendConditionalInvalid(); m_context.appendConditionalInvalid();
} }
m_context << Instruction::SWAP1;
// stack: value_to_shift shift_amount
switch (_operator) switch (_operator)
{ {
case Token::SHL: 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; break;
case Token::SAR: 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; break;
case Token::SHR: case Token::SHR:
default: default: