mirror of
https://github.com/ZDoom/Raze.git
synced 2024-12-03 09:32:45 +00:00
120 lines
2.8 KiB
C++
120 lines
2.8 KiB
C++
/**
|
|
* @file SFMT.h
|
|
*
|
|
* @brief SIMD oriented Fast Mersenne Twister(SFMT) pseudorandom
|
|
* number generator
|
|
*
|
|
* @author Mutsuo Saito (Hiroshima University)
|
|
* @author Makoto Matsumoto (Hiroshima University)
|
|
*
|
|
* Copyright (C) 2006, 2007 Mutsuo Saito, Makoto Matsumoto and Hiroshima
|
|
* University. All rights reserved.
|
|
*
|
|
* The new BSD License is applied to this software.
|
|
* see LICENSE.txt
|
|
*
|
|
* @note We assume that your system has inttypes.h. If your system
|
|
* doesn't have inttypes.h, you have to typedef uint32_t and uint64_t,
|
|
* and you have to define PRIu64 and PRIx64 in this file as follows:
|
|
* @verbatim
|
|
typedef unsigned int uint32_t
|
|
typedef unsigned long long uint64_t
|
|
#define PRIu64 "llu"
|
|
#define PRIx64 "llx"
|
|
@endverbatim
|
|
* uint32_t must be exactly 32-bit unsigned integer type (no more, no
|
|
* less), and uint64_t must be exactly 64-bit unsigned integer type.
|
|
* PRIu64 and PRIx64 are used for printf function to print 64-bit
|
|
* unsigned int and 64-bit unsigned int in hexadecimal format.
|
|
*/
|
|
|
|
#ifndef SFMT_H
|
|
#define SFMT_H
|
|
|
|
#ifndef PRIu64
|
|
#if defined(_MSC_VER) || defined(__BORLANDC__)
|
|
#define PRIu64 "I64u"
|
|
#define PRIx64 "I64x"
|
|
#else
|
|
#define PRIu64 "llu"
|
|
#define PRIx64 "llx"
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(__GNUC__)
|
|
#define ALWAYSINLINE __attribute__((always_inline))
|
|
#else
|
|
#define ALWAYSINLINE
|
|
#endif
|
|
|
|
#if defined(_MSC_VER)
|
|
#if _MSC_VER >= 1200
|
|
#define PRE_ALWAYS __forceinline
|
|
#else
|
|
#define PRE_ALWAYS inline
|
|
#endif
|
|
#else
|
|
#define PRE_ALWAYS inline
|
|
#endif
|
|
|
|
/*------------------------------------------------------
|
|
128-bit SIMD data type for Altivec, SSE2 or standard C
|
|
------------------------------------------------------*/
|
|
#if defined(HAVE_ALTIVEC)
|
|
#if !defined(__APPLE__)
|
|
#include <altivec.h>
|
|
#endif
|
|
/** 128-bit data structure */
|
|
union w128_t {
|
|
vector unsigned int s;
|
|
uint32_t u[4];
|
|
uint64_t u64[2];
|
|
};
|
|
|
|
#elif defined(HAVE_SSE2)
|
|
#include <emmintrin.h>
|
|
|
|
/** 128-bit data structure */
|
|
union w128_t {
|
|
__m128i si;
|
|
uint32_t u[4];
|
|
uint64_t u64[2];
|
|
};
|
|
|
|
#else
|
|
|
|
/** 128-bit data structure */
|
|
union w128_t {
|
|
uint32_t u[4];
|
|
uint64_t u64[2];
|
|
};
|
|
|
|
#endif
|
|
|
|
/*-----------------
|
|
BASIC DEFINITIONS
|
|
-----------------*/
|
|
|
|
/** Mersenne Exponent. The period of the sequence
|
|
* is a multiple of 2^MEXP-1. */
|
|
#if !defined(MEXP)
|
|
// [RH] The default MEXP for SFMT is 19937, but since that consumes
|
|
// quite a lot of space for state, and we're using lots of different
|
|
// RNGs, default to something smaller.
|
|
#define MEXP 607
|
|
#endif
|
|
|
|
namespace SFMT
|
|
{
|
|
/** SFMT generator has an internal state array of 128-bit integers,
|
|
* and N is its size. */
|
|
enum { N = MEXP / 128 + 1 };
|
|
/** N32 is the size of internal state array when regarded as an array
|
|
* of 32-bit integers.*/
|
|
enum { N32 = N * 4 };
|
|
/** N64 is the size of internal state array when regarded as an array
|
|
* of 64-bit integers.*/
|
|
enum { N64 = N * 2 };
|
|
};
|
|
|
|
#endif
|