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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 #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
  53 void halt(void);
  54 #pragma aux halt = "hlt";
  55 #endif
  56
  57 #ifdef __GNUC__
  58 #define perf_start()  asm volatile ( \
  59         "xor %%eax, %%eax\n" \
  60         "cpuid\n" \
  61         "rdtsc\n" \
  62         "mov %%eax, %0\n" \
  63         : "=m"(perf_start_count) \
  64         :: "%eax", "%ebx", "%ecx", "%edx")
  65
  66 #define perf_end() asm volatile ( \
  67         "xor %%eax, %%eax\n" \
  68         "cpuid\n" \
  69         "rdtsc\n" \
  70         "sub %1, %%eax\n" \
  71         "mov %%eax, %0\n" \
  72         : "=m"(perf_interval_count) \
  73         : "m"(perf_start_count) \
  74         : "%eax", "%ebx", "%ecx", "%edx")
  75
  76 #define debug_break() \
  77         asm volatile ("int $3")
  78
  79 #define halt() \
  80         asm volatile("hlt")
  81 #endif
  82
  83 #ifdef _MSC_VER
  84 #define perf_start() \
  85         do { \
  86                 __asm { \
  87                         xor eax, eax \
  88                         cpuid \
  89                         rdtsc \
  90                         mov [perf_start_count], eax \
  91                 } \
  92         } while(0)
  93
  94 #define perf_end() \
  95         do { \
  96                 __asm { \
  97                         xor eax, eax \
  98                         cpuid \
  99                         rdtsc \
 100                         sub eax, [perf_start_count] \
 101                         mov [perf_interval_count], eax \
 102                 } \
 103         } while(0)
 104
 105 #define debug_break() \
 106         do { \
 107                 __asm { int 3 } \
 108         } while(0)
 109 #endif
 110
 111 #endif  /* UTIL_H_ */