ClickHouse/dbms/src/Functions/bitShiftRight.cpp
2018-12-27 02:55:09 +03:00

39 lines
1.1 KiB
C++

#include <Functions/FunctionFactory.h>
#include <Functions/FunctionBinaryArithmetic.h>
namespace DB
{
template <typename A, typename B>
struct BitShiftRightImpl
{
using ResultType = typename NumberTraits::ResultOfBit<A, B>::Type;
template <typename Result = ResultType>
static inline NO_SANITIZE_UNDEFINED Result apply(A a, B b)
{
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 is_signed)
{
if (!left->getType()->isIntegerTy())
throw Exception("BitShiftRightImpl expected an integral type", ErrorCodes::LOGICAL_ERROR);
return is_signed ? b.CreateAShr(left, right) : b.CreateLShr(left, right);
}
#endif
};
struct NameBitShiftRight { static constexpr auto name = "bitShiftRight"; };
using FunctionBitShiftRight = FunctionBinaryArithmetic<BitShiftRightImpl, NameBitShiftRight>;
void registerFunctionBitShiftRight(FunctionFactory & factory)
{
factory.registerFunction<FunctionBitShiftRight>();
}
}