ClickHouse/dbms/src/Functions/tanh.cpp
2019-08-01 06:06:15 +03:00

47 lines
905 B
C++

#include <Functions/FunctionMathUnary.h>
#include <Functions/FunctionFactory.h>
namespace DB
{
struct TanhName { static constexpr auto name = "tanh"; };
#if USE_FASTOPS
namespace
{
struct Impl
{
static constexpr auto name = TanhName::name;
static constexpr auto rows_per_iteration = 0;
static constexpr bool always_returns_float64 = false;
template <typename T>
static void execute(const T * src, size_t size, T * dst)
{
NFastOps::Tanh<>(src, size, dst);
}
};
}
using FunctionTanh = FunctionMathUnary<Impl>;
#else
static double tanh(double x)
{
return 2 / (1.0 + exp(-2 * x)) - 1;
}
using FunctionTanh = FunctionMathUnary<UnaryFunctionVectorized<TanhName, tanh>>;
#endif
void registerFunctionTanh(FunctionFactory & factory)
{
factory.registerFunction<FunctionTanh>(FunctionFactory::CaseInsensitive);
}
}