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#pragma once
#include <c10/macros/Macros.h>
// Utility to guaruntee complete unrolling of a loop where the bounds are known
// at compile time. Various pragmas achieve similar effects, but are not as
// portable across compilers.
// Example: c10::ForcedUnroll<4>{}(f); is equivalent to f(0); f(1); f(2); f(3);
namespace c10 {
template <int n>
struct ForcedUnroll {
template <typename Func>
C10_ALWAYS_INLINE void operator()(const Func& f) const {
ForcedUnroll<n - 1>{}(f);
f(n - 1);
}
};
template <>
struct ForcedUnroll<1> {
template <typename Func>
C10_ALWAYS_INLINE void operator()(const Func& f) const {
f(0);
}
};
} // namespace c10
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