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Use native shift instructions in ABIFunctions on Constantinople

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Alex Beregszaszi committed 2018-04-30 20:34:43 +01:00
1 parent 22bfd3da41
commit c3608eaf90
3 files changed
+70 -26
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libsolidity/codegen/ABIFunctions.cpp
+62 -25
View File
@@ -1401,37 +1401,74 @@ string ABIFunctions::copyToMemoryFunction(bool _fromCalldata)
string ABIFunctions::shiftLeftFunction(size_t _numBits)
{
solAssert(_numBits < 256, "");
string functionName = "shift_left_" + to_string(_numBits);
return createFunction(functionName, [&]() {
solAssert(_numBits < 256, "");
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := mul(value, <multiplier>)
}
)")
("functionName", functionName)
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
if (m_evmVersion.hasBitwiseShifting())
{
return createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := shl(<numBits>, value)
}
)")
("functionName", functionName)
("numBits", to_string(_numBits))
.render();
});
}
else
{
return createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := mul(value, <multiplier>)
}
)")
("functionName", functionName)
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
}
}
string ABIFunctions::shiftRightFunction(size_t _numBits, bool _signed)
{
solAssert(_numBits < 256, "");
string functionName = "shift_right_" + to_string(_numBits) + (_signed ? "_signed" : "_unsigned");
return createFunction(functionName, [&]() {
solAssert(_numBits < 256, "");
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := <div>(value, <multiplier>)
}
)")
("functionName", functionName)
("div", _signed ? "sdiv" : "div")
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
if (m_evmVersion.hasBitwiseShifting())
{
return createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := <shiftOp>(<numBits>, value)
}
)")
("functionName", functionName)
("shiftOp", _signed ? "sar" : "shr")
("numBits", to_string(_numBits))
.render();
});
}
else
{
return createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := <div>(value, <multiplier>)
}
)")
("functionName", functionName)
("div", _signed ? "sdiv" : "div")
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
}
}
string ABIFunctions::roundUpFunction()