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  1. #include <cstring>
  2. #include <ctime>
  3. #include <iostream>
  4. #include <vector>
  5.  
  6. struct Frame
  7. {
  8. 	Frame()
  9. 		: start(std::clock())
  10. 	{
  11. 	}
  12.  
  13. 	~Frame()
  14. 	{
  15. 		clocks += std::clock() - start;
  16. 		++frames;
  17. 	}
  18.  
  19. 	static double GetTime()
  20. 	{
  21. 		if (!frames)
  22. 			return 0;
  23.  
  24. 		return clocks * 1000.0 / CLOCKS_PER_SEC / frames;
  25. 	}
  26.  
  27. 	std::clock_t start;
  28. 	static std::clock_t clocks;
  29. 	static std::uint64_t frames;
  30. };
  31.  
  32. std::clock_t Frame::clocks;
  33. std::uint64_t Frame::frames;
  34.  
  35. #define FRAME_START() { Frame __frame;
  36. #define FRAME_STOP() }
  37.  
  38. int main()
  39. {
  40. 	const int size = 1024*1024;
  41. 	std::vector<int> a(size), b(size);
  42.  
  43. 	for (int k = 0; k < 1000; ++k) {
  44. 		FRAME_START()
  45. 		int *pa = a.data();
  46. 		int *pb = b.data();
  47. 		for (int i = 0; i < 1024; ++i) {
  48. #if 1
  49. 			std::memcpy(pa, pb, 1024 * 4);
  50. 			pa += 1024;
  51. 			pb += 1024;
  52. #else
  53. 			for (int j = 0; j < 1024; ++j)
  54. 				*pa++ = *pb++;
  55. #endif
  56. 		}
  57. 		FRAME_STOP()
  58. 	}
  59.  
  60. 	std::cout << "Frame time: "<< Frame::GetTime() << "\n";
  61. }
Success #stdin #stdout 0.32s 15232KB
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Standard input is empty
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Frame time: 0.323903
https://ideone.com/6PvDH3
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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