edponce commented on a change in pull request #10349:
URL: https://github.com/apache/arrow/pull/10349#discussion_r658690788
##########
File path: cpp/src/arrow/compute/kernels/scalar_arithmetic.cc
##########
@@ -454,6 +456,159 @@ struct PowerChecked {
}
};
+using RoundState = internal::OptionsWrapper<RoundOptions>;
+
+struct Round {
+ template <typename T, enable_if_t<std::is_floating_point<T>::value, bool> =
true>
+ static constexpr bool ApproxEqual(T x, T y, int ulp = 8) {
+ // https://en.cppreference.com/w/cpp/types/numeric_limits/epsilon
+ // The machine epsilon has to be scaled to the magnitude of the values used
+ // and multiplied by the desired precision in ULPs (units in the last
place)
+ return (std::fabs(x - y) <=
+ (std::numeric_limits<T>::epsilon() * std::fabs(x + y) * ulp))
+ // unless the result is subnormal
+ || (std::fabs(x - y) < std::numeric_limits<T>::min());
+ }
+
+ template <typename T, enable_if_t<std::is_floating_point<T>::value, bool> =
true>
+ static constexpr bool IsHalf(T val) {
+ // |frac| == 0.5?
+ return ApproxEqual(std::fabs(std::fmod(val, T(1))), T(0.5));
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> RoundWithMultiple(T val, T
mult) {
+ return (val / mult) * mult;
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> Floor(T val) {
+ return std::floor(val);
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> Ceiling(T val) {
+ return std::ceil(val);
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> Truncate(T val) {
+ return std::trunc(val);
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> TowardsInfinity(T val) {
+ return std::signbit(val) ? std::floor(val) : std::ceil(val);
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> HalfDown(T val) {
+ return std::ceil(val - T(0.5));
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> HalfUp(T val) {
+ return std::floor(val + T(0.5));
+ }
+
+ template <typename T>
+ static enable_if_floating_point<T> HalfToEven(T val) {
+ if (IsHalf(val)) {
+ auto floor = std::floor(val);
+ // Odd + 1, Even + 0
+ return floor + (std::fmod(std::fabs(floor), T(2)) >= T(1));
+ }
+ return std::round(val);
+ }
+
+ template <typename T>
+ static enable_if_floating_point<T> HalfToOdd(T val) {
+ if (IsHalf(val)) {
+ auto floor = std::floor(val);
+ // Odd + 0, Even + 1
+ return floor + (std::fmod(std::fabs(floor), T(2)) < T(1));
+ }
+ return std::round(val);
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> Nearest(T val) {
+ return std::round(val);
+ }
+
+ template <typename T>
+ static constexpr enable_if_floating_point<T> HalfTowardsZero(T val) {
+ return std::copysign(std::ceil(std::fabs(val) - T(0.5)), val);
+ }
+
+ template <typename T, typename Arg,
+ enable_if_t<std::is_integral<Arg>::value, bool> = true>
+ static constexpr enable_if_floating_point<T> Call(KernelContext* ctx, Arg
arg,
+ Status* st) {
+ return Call<T, T>(ctx, T(arg), st);
+ }
+
+ template <typename T, typename Arg,
+ enable_if_t<std::is_floating_point<Arg>::value, bool> = true>
+ static enable_if_floating_point<T> Call(KernelContext* ctx, Arg arg, Status*
st) {
+ const RoundOptions& options = RoundState::Get(ctx);
Review comment:
@bkietz @lidavidm How do you pass FunctionOptions to scalar arithmetic
kernels? This currently segfaults when tests are ran. I am passing
[`RoundOptions::Defaults()`](https://github.com/edponce/arrow/blob/ARROW-12744-Add-rounding-kernel/cpp/src/arrow/compute/kernels/scalar_arithmetic.cc#L1117-L1119)
to [`ArithmeticFunction
constructor`](https://github.com/edponce/arrow/blob/ARROW-12744-Add-rounding-kernel/cpp/src/arrow/compute/kernels/scalar_arithmetic.cc#L911-L915),
but it seems options are not set properly in `KernelContext` and
`RoundState::Get(ctx)` does not works properly.
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