SFMT.h

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#pragma once

#ifndef SFMTST_H
#define SFMTST_H
#if defined(__cplusplus)
extern "C" {
#endif

#include <stdio.h>
#include <assert.h>

#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
  #include <inttypes.h>
#elif defined(_MSC_VER) || defined(__BORLANDC__)
  typedef unsigned int uint32_t;
  typedef unsigned __int64 uint64_t;
  #define inline __inline
#else
  #include <inttypes.h>
  #if defined(__GNUC__)
    #define inline __inline__
  #endif
#endif

#ifndef PRIu64
  #if defined(_MSC_VER) || defined(__BORLANDC__)
    #define PRIu64 "I64u"
    #define PRIx64 "I64x"
  #else
    #define PRIu64 "llu"
    #define PRIx64 "llx"
  #endif
#endif

#include "SFMT-params.h"

/*------------------------------------------
  128-bit SIMD like data type for standard C
  ------------------------------------------*/
#if defined(HAVE_ALTIVEC)
  #if !defined(__APPLE__)
    #include <altivec.h>
  #endif

union W128_T {
    vector unsigned int s;
    uint32_t u[4];
    uint64_t u64[2];
};
#elif defined(HAVE_SSE2)
  #include <emmintrin.h>

union W128_T {
    uint32_t u[4];
    uint64_t u64[2];
    __m128i si;
};
#else

union W128_T {
    uint32_t u[4];
    uint64_t u64[2];
};
#endif

typedef union W128_T w128_t;

struct SFMT_T {
    w128_t state[SFMT_N];
    int idx;
};

typedef struct SFMT_T sfmt_t;

void sfmt_fill_array32(sfmt_t * sfmt, uint32_t * array, int size);
void sfmt_fill_array64(sfmt_t * sfmt, uint64_t * array, int size);
void sfmt_init_gen_rand(sfmt_t * sfmt, uint32_t seed);
void sfmt_init_by_array(sfmt_t * sfmt, uint32_t * init_key, int key_length);
const char * sfmt_get_idstring(sfmt_t * sfmt);
int sfmt_get_min_array_size32(sfmt_t * sfmt);
int sfmt_get_min_array_size64(sfmt_t * sfmt);
void sfmt_gen_rand_all(sfmt_t * sfmt);

#ifndef ONLY64

inline static uint32_t sfmt_genrand_uint32(sfmt_t * sfmt) {
    uint32_t r;
    uint32_t * psfmt32 = &sfmt->state[0].u[0];

    if (sfmt->idx >= SFMT_N32) {
        sfmt_gen_rand_all(sfmt);
        sfmt->idx = 0;
    }
    r = psfmt32[sfmt->idx++];
    return r;
}
#endif

inline static uint64_t sfmt_genrand_uint64(sfmt_t * sfmt) {
#if defined(BIG_ENDIAN64) && !defined(ONLY64)
    uint32_t * psfmt32 = &sfmt->state[0].u[0];
    uint32_t r1, r2;
#else
    uint64_t r;
#endif
    uint64_t * psfmt64 = &sfmt->state[0].u64[0];
    assert(sfmt->idx % 2 == 0);

    if (sfmt->idx >= SFMT_N32) {
        sfmt_gen_rand_all(sfmt);
        sfmt->idx = 0;
    }
#if defined(BIG_ENDIAN64) && !defined(ONLY64)
    r1 = psfmt32[sfmt->idx];
    r2 = psfmt32[sfmt->idx + 1];
    sfmt->idx += 2;
    return ((uint64_t)r2 << 32) | r1;
#else
    r = psfmt64[sfmt->idx / 2];
    sfmt->idx += 2;
    return r;
#endif
}

/* =================================================
   The following real versions are due to Isaku Wada
   ================================================= */
inline static double sfmt_to_real1(uint32_t v)
{
    return v * (1.0/4294967295.0);
    /* divided by 2^32-1 */
}

inline static double sfmt_genrand_real1(sfmt_t * sfmt)
{
    return sfmt_to_real1(sfmt_genrand_uint32(sfmt));
}

inline static double sfmt_to_real2(uint32_t v)
{
    return v * (1.0/4294967296.0);
    /* divided by 2^32 */
}

inline static double sfmt_genrand_real2(sfmt_t * sfmt)
{
    return sfmt_to_real2(sfmt_genrand_uint32(sfmt));
}

inline static double sfmt_to_real3(uint32_t v)
{
    return (((double)v) + 0.5)*(1.0/4294967296.0);
    /* divided by 2^32 */
}

inline static double sfmt_genrand_real3(sfmt_t * sfmt)
{
    return sfmt_to_real3(sfmt_genrand_uint32(sfmt));
}

inline static double sfmt_to_res53(uint64_t v)
{
    return v * (1.0/18446744073709551616.0L);
}

inline static double sfmt_genrand_res53(sfmt_t * sfmt)
{
    return sfmt_to_res53(sfmt_genrand_uint64(sfmt));
}


/* =================================================
   The following function are added by Saito.
   ================================================= */
inline static double sfmt_to_res53_mix(uint32_t x, uint32_t y)
{
    return sfmt_to_res53(x | ((uint64_t)y << 32));
}

inline static double sfmt_genrand_res53_mix(sfmt_t * sfmt)
{
    uint32_t x, y;

    x = sfmt_genrand_uint32(sfmt);
    y = sfmt_genrand_uint32(sfmt);
    return sfmt_to_res53_mix(x, y);
}

#if defined(__cplusplus)
}
#endif

#endif