31 lines
843 B
C
31 lines
843 B
C
|
#pragma once
|
||
|
|
#include <c10/macros/Macros.h>
|
||
|
|
#include <type_traits>
|
||
|
|
|
||
|
|
// Utility to guarantee 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, typename... Args>
|
||
|
|
C10_ALWAYS_INLINE void operator()(const Func& f, Args... args) const {
|
||
|
|
ForcedUnroll<n - 1>{}(f, args...);
|
||
|
|
f(std::integral_constant<int, n - 1>{}, args...);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template <>
|
||
|
|
struct ForcedUnroll<1> {
|
||
|
|
template <typename Func, typename... Args>
|
||
|
|
C10_ALWAYS_INLINE void operator()(const Func& f, Args... args) const {
|
||
|
|
f(std::integral_constant<int, 0>{}, args...);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace c10
|