ClickHouse/src/Functions/bitShiftLeft.cpp
2020-09-13 21:55:12 +08:00

55 lines
1.6 KiB
C++

#include <Functions/FunctionFactory.h>
#include <Functions/FunctionBinaryArithmetic.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
extern const int LOGICAL_ERROR;
}
namespace
{
template <typename A, typename B>
struct BitShiftLeftImpl
{
using ResultType = typename NumberTraits::ResultOfBit<A, B>::Type;
static const constexpr bool allow_fixed_string = false;
template <typename Result = ResultType>
static inline NO_SANITIZE_UNDEFINED Result apply(A a [[maybe_unused]], B b [[maybe_unused]])
{
if constexpr (is_big_int_v<B>)
throw Exception("BitShiftLeft is not implemented for big integers as second argument", ErrorCodes::NOT_IMPLEMENTED);
else if constexpr (is_big_int_v<A>)
return bigint_cast<Result>(a) << bigint_cast<UInt32>(b);
else
return static_cast<Result>(a) << static_cast<Result>(b);
}
#if USE_EMBEDDED_COMPILER
static constexpr bool compilable = true;
static inline llvm::Value * compile(llvm::IRBuilder<> & b, llvm::Value * left, llvm::Value * right, bool)
{
if (!left->getType()->isIntegerTy())
throw Exception("BitShiftLeftImpl expected an integral type", ErrorCodes::LOGICAL_ERROR);
return b.CreateShl(left, right);
}
#endif
};
struct NameBitShiftLeft { static constexpr auto name = "bitShiftLeft"; };
using FunctionBitShiftLeft = BinaryArithmeticOverloadResolver<BitShiftLeftImpl, NameBitShiftLeft>;
}
void registerFunctionBitShiftLeft(FunctionFactory & factory)
{
factory.registerFunction<FunctionBitShiftLeft>();
}
}