git.mutantstargoat.com Git - dosdemo/blob - src/util.h

   1 #ifndef UTIL_H_
   2 #define UTIL_H_
   3
   4 #include "inttypes.h"
   5
   6 #ifdef __GNUC__
   7 #define INLINE __inline
   8 #define PACKED __attribute__((packed))
   9
  10 #elif defined(__WATCOMC__)
  11 #define INLINE __inline
  12 #define PACKED
  13
  14 #else
  15 #define INLINE
  16 #define PACKED
  17 #endif
  18
  19 /* fast conversion of double -> 32bit int
  20  * for details see:
  21  *  - http://chrishecker.com/images/f/fb/Gdmfp.pdf
  22  *  - http://stereopsis.com/FPU.html#convert
  23  */
  24 static INLINE int32_t cround64(double val)
  25 {
  26         val += 6755399441055744.0;
  27         return *(int32_t*)&val;
  28 }
  29
  30 extern uint32_t perf_start_count, perf_interval_count;
  31
  32 #ifdef __WATCOMC__
  33 void perf_start(void);
  34 #pragma aux perf_start = \
  35         "xor eax, eax" \
  36         "cpuid" \
  37         "rdtsc" \
  38         "mov [perf_start_count], eax" \
  39         modify[eax ebx ecx edx];
  40
  41 void perf_end(void);
  42 #pragma aux perf_end = \
  43         "xor eax, eax" \
  44         "cpuid" \
  45         "rdtsc" \
  46         "sub eax, [perf_start_count]" \
  47         "mov [perf_interval_count], eax" \
  48         modify [eax ebx ecx edx];
  49
  50 void debug_break(void);
  51 #pragma aux debug_break = "int 3";
  52 #endif
  53
  54 #ifdef __GNUC__
  55 #define perf_start()  asm volatile ( \
  56         "xor %%eax, %%eax\n" \
  57         "cpuid\n" \
  58         "rdtsc\n" \
  59         "mov %%eax, %0\n" \
  60         : "=m"(perf_start_count) \
  61         :: "%eax", "%ebx", "%ecx", "%edx")
  62
  63 #define perf_end() asm volatile ( \
  64         "xor %%eax, %%eax\n" \
  65         "cpuid\n" \
  66         "rdtsc\n" \
  67         "sub %1, %%eax\n" \
  68         "mov %%eax, %0\n" \
  69         : "=m"(perf_interval_count) \
  70         : "m"(perf_start_count) \
  71         : "%eax", "%ebx", "%ecx", "%edx")
  72
  73 #define debug_break() \
  74         asm volatile ("int $3")
  75 #endif
  76
  77 #ifdef _MSC_VER
  78 #define perf_start() \
  79         do { \
  80                 __asm { \
  81                         xor eax, eax \
  82                         cpuid \
  83                         rdtsc \
  84                         mov [perf_start_count], eax \
  85                 } \
  86         } while(0)
  87
  88 #define perf_end() \
  89         do { \
  90                 __asm { \
  91                         xor eax, eax \
  92                         cpuid \
  93                         rdtsc \
  94                         sub eax, [perf_start_count] \
  95                         mov [perf_interval_count], eax \
  96                 } \
  97         } while(0)
  98
  99 #define debug_break() \
 100         do { \
 101                 __asm { int 3 } \
 102         } while(0)
 103 #endif
 104
 105 #endif  /* UTIL_H_ */