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#pragma once
#include <util/system/compiler.h>
#include <util/system/types.h>
#include <utility>
namespace NBench {
namespace NCpu {
struct TParams {
inline size_t Iterations() const noexcept {
return Iterations_;
}
const size_t Iterations_;
};
using TUserFunc = void(TParams&);
struct TRegistar {
TRegistar(const char* name, TUserFunc func);
char Buf[128];
};
}
/**
* Functions that states "I can read and write everywhere in memory".
*
* Use it to prevent optimizer from reordering or discarding memory writes prior to it's call,
* and force memory reads after it's call.
*/
void Clobber();
/**
* Forces whatever `p` points to be in memory and not in register.
*
* @param Pointer to data.
*/
template <typename T>
void Escape(T* p);
#if defined(__GNUC__)
Y_FORCE_INLINE void Clobber() {
asm volatile(""
:
:
: "memory");
}
#elif defined(_MSC_VER)
Y_FORCE_INLINE void Clobber() {
_ReadWriteBarrier();
}
#else
Y_FORCE_INLINE void Clobber() {
}
#endif
#if defined(__GNUC__)
template <typename T>
Y_FORCE_INLINE void Escape(T* p) {
asm volatile(""
:
: "g"(p)
: "memory");
}
#else
template <typename T>
Y_FORCE_INLINE void Escape(T*) {
}
#endif
/**
* Use this function to prevent unused variables elimination.
*
* @param Unused variable (e.g. return value of benchmarked function).
*/
template <typename T>
Y_FORCE_INLINE void DoNotOptimize(T&& datum) {
::DoNotOptimizeAway(std::forward<T>(datum));
}
int Main(int argc, char** argv);
}
#define Y_CPU_BENCHMARK(name, cnt) \
namespace N_bench_##name { \
static void Run(::NBench::NCpu::TParams&); \
const ::NBench::NCpu::TRegistar benchmark(#name, &Run); \
} \
static void N_bench_##name::Run(::NBench::NCpu::TParams& cnt)
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