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#ifndef _RANDOMDGEN__PHILOX_H_
#define _RANDOMDGEN__PHILOX_H_
#include "numpy/npy_common.h"
#include <inttypes.h>
#define PHILOX_BUFFER_SIZE 4L
struct r123array2x64 {
uint64_t v[2];
};
struct r123array4x64 {
uint64_t v[4];
};
enum r123_enum_philox4x64 { philox4x64_rounds = 10 };
typedef struct r123array4x64 philox4x64_ctr_t;
typedef struct r123array2x64 philox4x64_key_t;
typedef struct r123array2x64 philox4x64_ukey_t;
static NPY_INLINE struct r123array2x64
_philox4x64bumpkey(struct r123array2x64 key) {
key.v[0] += (0x9E3779B97F4A7C15ULL);
key.v[1] += (0xBB67AE8584CAA73BULL);
return key;
}
/* Prefer uint128 if available: GCC, clang, ICC */
#ifdef __SIZEOF_INT128__
static NPY_INLINE uint64_t mulhilo64(uint64_t a, uint64_t b, uint64_t *hip) {
__uint128_t product = ((__uint128_t)a) * ((__uint128_t)b);
*hip = product >> 64;
return (uint64_t)product;
}
#else
#ifdef _WIN32
#include <intrin.h>
#if defined(_WIN64) && defined(_M_AMD64)
#pragma intrinsic(_umul128)
#else
#pragma intrinsic(__emulu)
static NPY_INLINE uint64_t _umul128(uint64_t a, uint64_t b, uint64_t *high) {
uint64_t a_lo, a_hi, b_lo, b_hi, a_x_b_hi, a_x_b_mid, a_x_b_lo, b_x_a_mid,
carry_bit;
a_lo = (uint32_t)a;
a_hi = a >> 32;
b_lo = (uint32_t)b;
b_hi = b >> 32;
a_x_b_hi = __emulu(a_hi, b_hi);
a_x_b_mid = __emulu(a_hi, b_lo);
b_x_a_mid = __emulu(b_hi, a_lo);
a_x_b_lo = __emulu(a_lo, b_lo);
carry_bit = ((uint64_t)(uint32_t)a_x_b_mid + (uint64_t)(uint32_t)b_x_a_mid +
(a_x_b_lo >> 32)) >>
32;
*high = a_x_b_hi + (a_x_b_mid >> 32) + (b_x_a_mid >> 32) + carry_bit;
return a_x_b_lo + ((a_x_b_mid + b_x_a_mid) << 32);
}
#endif
static NPY_INLINE uint64_t mulhilo64(uint64_t a, uint64_t b, uint64_t *hip) {
return _umul128(a, b, hip);
}
#else
static NPY_INLINE uint64_t _umul128(uint64_t a, uint64_t b, uint64_t *high) {
uint64_t a_lo, a_hi, b_lo, b_hi, a_x_b_hi, a_x_b_mid, a_x_b_lo, b_x_a_mid,
carry_bit;
a_lo = (uint32_t)a;
a_hi = a >> 32;
b_lo = (uint32_t)b;
b_hi = b >> 32;
a_x_b_hi = a_hi * b_hi;
a_x_b_mid = a_hi * b_lo;
b_x_a_mid = b_hi * a_lo;
a_x_b_lo = a_lo * b_lo;
carry_bit = ((uint64_t)(uint32_t)a_x_b_mid + (uint64_t)(uint32_t)b_x_a_mid +
(a_x_b_lo >> 32)) >>
32;
*high = a_x_b_hi + (a_x_b_mid >> 32) + (b_x_a_mid >> 32) + carry_bit;
return a_x_b_lo + ((a_x_b_mid + b_x_a_mid) << 32);
}
static NPY_INLINE uint64_t mulhilo64(uint64_t a, uint64_t b, uint64_t *hip) {
return _umul128(a, b, hip);
}
#endif
#endif
static NPY_INLINE struct r123array4x64 _philox4x64round(struct r123array4x64 ctr,
struct r123array2x64 key);
static NPY_INLINE struct r123array4x64 _philox4x64round(struct r123array4x64 ctr,
struct r123array2x64 key) {
uint64_t hi0;
uint64_t hi1;
uint64_t lo0 = mulhilo64((0xD2E7470EE14C6C93ULL), ctr.v[0], &hi0);
uint64_t lo1 = mulhilo64((0xCA5A826395121157ULL), ctr.v[2], &hi1);
struct r123array4x64 out = {
{hi1 ^ ctr.v[1] ^ key.v[0], lo1, hi0 ^ ctr.v[3] ^ key.v[1], lo0}};
return out;
}
static NPY_INLINE philox4x64_key_t philox4x64keyinit(philox4x64_ukey_t uk) {
return uk;
}
static NPY_INLINE philox4x64_ctr_t philox4x64_R(unsigned int R,
philox4x64_ctr_t ctr,
philox4x64_key_t key);
static NPY_INLINE philox4x64_ctr_t philox4x64_R(unsigned int R,
philox4x64_ctr_t ctr,
philox4x64_key_t key) {
if (R > 0) {
ctr = _philox4x64round(ctr, key);
}
if (R > 1) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 2) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 3) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 4) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 5) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 6) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 7) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 8) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 9) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 10) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 11) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 12) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 13) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 14) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
if (R > 15) {
key = _philox4x64bumpkey(key);
ctr = _philox4x64round(ctr, key);
}
return ctr;
}
typedef struct s_philox_state {
philox4x64_ctr_t *ctr;
philox4x64_key_t *key;
int buffer_pos;
uint64_t buffer[PHILOX_BUFFER_SIZE];
int has_uint32;
uint32_t uinteger;
} philox_state;
static NPY_INLINE uint64_t philox_next(philox_state *state) {
uint64_t out;
int i;
philox4x64_ctr_t ct;
if (state->buffer_pos < PHILOX_BUFFER_SIZE) {
out = state->buffer[state->buffer_pos];
state->buffer_pos++;
return out;
}
/* generate 4 new uint64_t */
state->ctr->v[0]++;
/* Handle carry */
if (state->ctr->v[0] == 0) {
state->ctr->v[1]++;
if (state->ctr->v[1] == 0) {
state->ctr->v[2]++;
if (state->ctr->v[2] == 0) {
state->ctr->v[3]++;
}
}
}
ct = philox4x64_R(philox4x64_rounds, *state->ctr, *state->key);
for (i = 0; i < 4; i++) {
state->buffer[i] = ct.v[i];
}
state->buffer_pos = 1;
return state->buffer[0];
}
static NPY_INLINE uint64_t philox_next64(philox_state *state) {
return philox_next(state);
}
static NPY_INLINE uint32_t philox_next32(philox_state *state) {
uint64_t next;
if (state->has_uint32) {
state->has_uint32 = 0;
return state->uinteger;
}
next = philox_next(state);
state->has_uint32 = 1;
state->uinteger = (uint32_t)(next >> 32);
return (uint32_t)(next & 0xffffffff);
}
extern void philox_jump(philox_state *state);
extern void philox_advance(uint64_t *step, philox_state *state);
#endif
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