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[Sol->Yul] Refactor shift functions to be consistent

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This commit is contained in:
Mathias Baumann 2019-06-06 17:59:30 +02:00
parent 89c435a167
commit 6a0976ed5e
1 changed files with 19 additions and 29 deletions
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48
libsolidity/codegen/YulUtilFunctions.cpp
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@ -224,34 +224,24 @@ string YulUtilFunctions::shiftLeftFunction(size_t _numBits)
solAssert(_numBits < 256, "");
string functionName = "shift_left_" + to_string(_numBits);
if (m_evmVersion.hasBitwiseShifting())
{
return m_functionCollector->createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := shl(<numBits>, value)
}
)")
("functionName", functionName)
("numBits", to_string(_numBits))
.render();
});
}
else
{
return m_functionCollector->createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue := mul(value, <multiplier>)
}
)")
("functionName", functionName)
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
}
return m_functionCollector->createFunction(functionName, [&]() {
return
Whiskers(R"(
function <functionName>(value) -> newValue {
newValue :=
<?hasShifts>
shl(<numBits>, value)
<!hasShifts>
mul(value, <multiplier>)
</hasShifts>
}
)")
("functionName", functionName)
("numBits", to_string(_numBits))
("hasShifts", m_evmVersion.hasBitwiseShifting())
("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
.render();
});
}
string YulUtilFunctions::dynamicShiftLeftFunction()
@ -282,7 +272,7 @@ string YulUtilFunctions::shiftRightFunction(size_t _numBits)
// Note that if this is extended with signed shifts,
// the opcodes SAR and SDIV behave differently with regards to rounding!
string functionName = "shift_right_" + to_string(_numBits) + "_unsigned_" + m_evmVersion.name();
string functionName = "shift_right_" + to_string(_numBits) + "_unsigned";
return m_functionCollector->createFunction(functionName, [&]() {
return
Whiskers(R"(