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[Sol->Yul] Remove index access from byte array pop function to optimize it.

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This commit is contained in:
Djordje Mijovic 2021-04-20 18:06:06 +02:00
parent c3f639b355
commit 0dd59fa0a2
2 changed files with 28 additions and 5 deletions
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28
libsolidity/codegen/YulUtilFunctions.cpp
View File

@ -1348,6 +1348,24 @@ string YulUtilFunctions::shortByteArrayEncodeUsedAreaSetLengthFunction()
});
}
string YulUtilFunctions::longByteArrayStorageIndexAccessNoCheckFunction()
{
return m_functionCollector.createFunction(
"long_byte_array_index_access_no_checks",
[&](vector<string>& _args, vector<string>& _returnParams) {
_args = {"array", "index"};
_returnParams = {"slot", "offset"};
return Whiskers(R"(
offset := sub(31, mod(index, 0x20))
let dataArea := <dataAreaFunc>(array)
slot := add(dataArea, div(index, 0x20))
)")
("dataAreaFunc", arrayDataAreaFunction(*TypeProvider::bytesStorage()))
.render();
}
);
}
string YulUtilFunctions::storageArrayPopFunction(ArrayType const& _type)
{
solAssert(_type.location() == DataLocation::Storage, "");
@ -1406,7 +1424,7 @@ string YulUtilFunctions::storageByteArrayPopFunction(ArrayType const& _type)
sstore(array, <encodeUsedSetLen>(data, newLen))
}
default {
let slot, offset := <indexAccess>(array, newLen)
let slot, offset := <indexAccessNoChecks>(array, newLen)
<setToZero>(slot, offset)
sstore(array, sub(data, 2))
}
@ -1417,7 +1435,7 @@ string YulUtilFunctions::storageByteArrayPopFunction(ArrayType const& _type)
("extractByteArrayLength", extractByteArrayLengthFunction())
("transitLongToShort", byteArrayTransitLongToShortFunction(_type))
("encodeUsedSetLen", shortByteArrayEncodeUsedAreaSetLengthFunction())
("indexAccess", storageArrayIndexAccessFunction(_type))
("indexAccessNoChecks", longByteArrayStorageIndexAccessNoCheckFunction())
("setToZero", storageSetToZeroFunction(*_type.baseType()))
.render();
});
@ -2112,13 +2130,12 @@ string YulUtilFunctions::storageArrayIndexAccessFunction(ArrayType const& _type)
<?multipleItemsPerSlot>
<?isBytesArray>
offset := sub(31, mod(index, 0x20))
switch lt(arrayLength, 0x20)
case 0 {
let dataArea := <dataAreaFunc>(array)
slot := add(dataArea, div(index, 0x20))
slot, offset := <indexAccessNoChecks>(array, index)
}
default {
offset := sub(31, mod(index, 0x20))
slot := array
}
<!isBytesArray>
@ -2137,6 +2154,7 @@ string YulUtilFunctions::storageArrayIndexAccessFunction(ArrayType const& _type)
("panic", panicFunction(PanicCode::ArrayOutOfBounds))
("arrayLen", arrayLengthFunction(_type))
("dataAreaFunc", arrayDataAreaFunction(_type))
("indexAccessNoChecks", longByteArrayStorageIndexAccessNoCheckFunction())
("multipleItemsPerSlot", _type.baseType()->storageBytes() <= 16)
("isBytesArray", _type.isByteArray())
("storageSize", _type.baseType()->storageSize().str())

5
libsolidity/codegen/YulUtilFunctions.h
View File

@ -552,6 +552,11 @@ private:
/// signature: (data, len) -> data
std::string shortByteArrayEncodeUsedAreaSetLengthFunction();
/// @returns the name of a function that calculates slot and offset for index
/// Doesn't perform length checks, assumes that index is in bounds
/// signature: (array, index)
std::string longByteArrayStorageIndexAccessNoCheckFunction();
langutil::EVMVersion m_evmVersion;
RevertStrings m_revertStrings;
MultiUseYulFunctionCollector& m_functionCollector;