pd.if.org Git - liblfds/blob - liblfds/liblfds7.1.0/test_and_benchmark/libbenchmark/inc/libbenchmark/libbenchmark_prng.h

   1 /***** defines *****/
   2 #define LIBBENCHMARK_PRNG_MAX   ( (lfds710_pal_uint_t) -1 )
   3
   4 // TRD : 32-bit SplitMix, derived from Sebastiano vigna's site, CC0 license, http://xorshift.di.unimi.it/splitmix64.c, and email with Dr. Vigna
   5 #if( LFDS710_PAL_ALIGN_SINGLE_POINTER == 4 ) // TRD : any 32-bit platform
   6   // TRD : struct LIBBENCHMARK_prng_state prng_state, lfds710_pal_uint_t seed
   7   #define LIBBENCHMARK_PRNG_INIT( prng_state, seed )  (prng_state).entropy = (seed), (prng_state).entropy = ((prng_state).entropy ^ ((prng_state).entropy >> 16)) * 0x85ebca6bUL, (prng_state).entropy = ((prng_state).entropy ^ ((prng_state).entropy >> 13)) * 0xc2b2ae35UL, (prng_state).entropy = ((prng_state).entropy ^ ((prng_state).entropy >> 16))
   8
   9   // TRD : struct libbenchmark_prng_state prng_state, LIBBENCHMARK_pal_atom_t random_value
  10   #define LIBBENCHMARK_PRNG_GENERATE( prng_state, random_value )                \
  11   {                                                                             \
  12     (random_value) = ( (prng_state).entropy += 0x9E3779B9UL );                  \
  13     (random_value) = ((random_value) ^ ((random_value) >> 16)) * 0x85ebca6bUL;  \
  14     (random_value) = ((random_value) ^ ((random_value) >> 13)) * 0xc2b2ae35UL;  \
  15     (random_value) = (random_value ^ (random_value >> 16));                     \
  16   }
  17
  18   #define LIBBENCHMARK_PRNG_MURMURHASH3_MIXING_FUNCTION( random_value )  \
  19   {                                                                      \
  20         (random_value) ^= ((random_value) >> 16);                            \
  21         (random_value) *= 0x85ebca6b;                                        \
  22         (random_value) ^= ((random_value) >> 13);                            \
  23         (random_value) *= 0xc2b2ae35;                                        \
  24         (random_value) ^= ((random_value) >> 16);                            \
  25   }
  26 #endif
  27
  28 // TRD : 64-bit SplitMix, from Sebastiano vigna's site, CC0 license, http://xorshift.di.unimi.it/splitmix64.c
  29 #if( LFDS710_PAL_ALIGN_SINGLE_POINTER == 8 ) // TRD : any 64-bit platform
  30   // TRD : struct LIBBENCHMARK_prng_state prng_state, LIBBENCHMARK_atom_uint_t seed
  31   #define LIBBENCHMARK_PRNG_INIT( prng_state, seed )  (prng_state).entropy = (seed), (prng_state).entropy = ((prng_state).entropy ^ ((prng_state).entropy >> 33)) * 0xff51afd7ed558ccdULL, (prng_state).entropy = ((prng_state).entropy ^ ((prng_state).entropy >> 33)) * 0xc4ceb9fe1a85ec53ULL, (prng_state).entropy = ((prng_state).entropy ^ ((prng_state).entropy >> 33))
  32
  33   // TRD : struct libbenchmark_prng_state prng_state, lfds710_pal_uint_t random_value
  34   #define LIBBENCHMARK_PRNG_GENERATE( prng_state, random_value )                         \
  35   {                                                                                      \
  36     (random_value) = ( (prng_state).entropy += 0x9E3779B97F4A7C15ULL );                  \
  37     (random_value) = ((random_value) ^ ((random_value) >> 30)) * 0xBF58476D1CE4E5B9ULL;  \
  38     (random_value) = ((random_value) ^ ((random_value) >> 27)) * 0x94D049BB133111EBULL;  \
  39     (random_value) = (random_value ^ (random_value >> 31));                              \
  40   }
  41
  42   #define LIBBENCHMARK_PRNG_MURMURHASH3_MIXING_FUNCTION( random_value )  \
  43   {                                                                      \
  44         (random_value) ^= (random_value) >> 33;                              \
  45         (random_value) *= 0xff51afd7ed558ccdULL;                             \
  46         (random_value) ^= (random_value) >> 33;                              \
  47         (random_value) *= 0xc4ceb9fe1a85ec53ULL;                             \
  48         (random_value) ^= (random_value) >> 33;                              \
  49   }
  50 #endif
  51
  52 /***** enums *****/
  53
  54 /***** structs *****/
  55 struct libbenchmark_prng_state
  56 {
  57   lfds710_pal_uint_t
  58     entropy;
  59 };
  60
  61 /***** externs *****/
  62
  63 /***** public prototypes *****/
  64