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Use native shift instructions on Constantinople

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This commit is contained in:
Alex Beregszaszi
2018-04-30 20:34:43 +01:00
parent 5cce2e552b
commit 22bfd3da41
3 changed files with 20 additions and 4 deletions
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libsolidity/codegen/ExpressionCompiler.cpp
+11 -2
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@@ -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: