git.sesse.net Git - narabu/blob - ryg_rans/platform.h

   1 // Just some platform utilities.
   2 #ifndef PLATFORM_H_INCLUDED
   3 #define PLATFORM_H_INCLUDED
   4
   5 // x86 intrinsics (__rdtsc etc.)
   6
   7 #if defined(_MSC_VER)
   8
   9 #define _CRT_SECURE_NO_DEPRECATE
  10 #include <intrin.h>
  11 #define ALIGNSPEC(type,name,alignment) __declspec(align(alignment)) type name
  12
  13 #elif defined(__GNUC__)
  14
  15 #include <x86intrin.h>
  16 #define ALIGNSPEC(type,name,alignment) type name __attribute__((aligned(alignment)))
  17
  18 #else
  19 #error Unknown compiler!
  20 #endif
  21
  22 // Timer
  23
  24 #if defined(_WIN32)
  25
  26 #define WIN32_LEAN_AND_MEAN
  27 #define NOMINMAX
  28 #include <Windows.h>
  29
  30 #define PRIu64 "llu"
  31
  32 double timer()
  33 {
  34     LARGE_INTEGER ctr, freq;
  35     QueryPerformanceCounter(&ctr);
  36     QueryPerformanceFrequency(&freq);
  37     return 1.0 * ctr.QuadPart / freq.QuadPart;
  38 }
  39
  40 #elif defined(__linux__)
  41
  42 #define __STDC_FORMAT_MACROS
  43 #include <time.h>
  44 #include <inttypes.h>
  45 #include <assert.h>
  46
  47 static inline double timer()
  48 {
  49     timespec ts;
  50     ts.tv_sec = 0;
  51     ts.tv_nsec = 0;
  52     int status = clock_gettime(CLOCK_MONOTONIC, &ts);
  53     assert(status == 0);
  54     return double(ts.tv_sec) + 1.0e-9 * double(ts.tv_nsec);
  55 }
  56
  57 #else
  58
  59 #error Unknown platform!
  60
  61 #endif
  62
  63 #endif // PLATFORM_H_INCLUDED
  64