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