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#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 BitRotateLeftImpl
{
using ResultType = typename NumberTraits::ResultOfBit<A, B>::Type;
static const constexpr bool allow_fixed_string = false;
static const constexpr bool allow_string_integer = 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<A> || is_big_int_v<B>)
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Bit rotate is not implemented for big integers");
else
return (static_cast<Result>(a) << static_cast<Result>(b))
| (static_cast<Result>(a) >> ((sizeof(Result) * 8) - 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(ErrorCodes::LOGICAL_ERROR, "BitRotateLeftImpl expected an integral type");
auto * size = llvm::ConstantInt::get(left->getType(), left->getType()->getPrimitiveSizeInBits());
/// XXX how is this supposed to behave in signed mode?
return b.CreateOr(b.CreateShl(left, right), b.CreateLShr(left, b.CreateSub(size, right)));
}
#endif
};
struct NameBitRotateLeft { static constexpr auto name = "bitRotateLeft"; };
using FunctionBitRotateLeft = BinaryArithmeticOverloadResolver<BitRotateLeftImpl, NameBitRotateLeft, true, false>;
}
REGISTER_FUNCTION(BitRotateLeft)
{
factory.registerFunction<FunctionBitRotateLeft>();
}
}
|
