mirror of
https://github.com/ZDoom/qzdoom-gpl.git
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583 lines
15 KiB
C++
583 lines
15 KiB
C++
/**
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* @file SFMT.c
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* @brief SIMD oriented Fast Mersenne Twister(SFMT)
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*
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* @author Mutsuo Saito (Hiroshima University)
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* @author Makoto Matsumoto (Hiroshima University)
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*
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* Copyright (C) 2006,2007 Mutsuo Saito, Makoto Matsumoto and Hiroshima
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* University. All rights reserved.
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*
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* The new BSD License is applied to this software, see LICENSE.txt
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*/
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#include <string.h>
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#include <assert.h>
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#include "m_random.h"
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#include "SFMT-params.h"
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#if defined(__BIG_ENDIAN__) && !defined(__amd64) && !defined(BIG_ENDIAN64)
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#define BIG_ENDIAN64 1
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#endif
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#if defined(HAVE_ALTIVEC) && !defined(BIG_ENDIAN64)
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#define BIG_ENDIAN64 1
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#endif
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#if defined(ONLY64) && !defined(BIG_ENDIAN64)
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#if defined(__GNUC__)
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#error "-DONLY64 must be specified with -DBIG_ENDIAN64"
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#endif
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#undef ONLY64
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#endif
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/** a parity check vector which certificate the period of 2^{MEXP} */
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static const DWORD parity[4] = { PARITY1, PARITY2, PARITY3, PARITY4 };
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/*----------------
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STATIC FUNCTIONS
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----------------*/
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inline static int idxof(int i);
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inline static void rshift128(w128_t *out, w128_t const *in, int shift);
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inline static void lshift128(w128_t *out, w128_t const *in, int shift);
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inline static DWORD func1(DWORD x);
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inline static DWORD func2(DWORD x);
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#if defined(BIG_ENDIAN64) && !defined(ONLY64)
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inline static void swap(w128_t *array, int size);
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#endif
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// These SIMD versions WILL NOT work as-is. I'm not even sure SSE2 is
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// safe to provide as a runtime option without significant changes to
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// how the state is stored, since the VC++ docs warn that:
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// Using variables of type __m128i will cause the compiler to generate
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// the SSE2 movdqa instruction. This instruction does not cause a fault
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// on Pentium III processors but will result in silent failure, with
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// possible side effects caused by whatever instructions movdqa
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// translates into on Pentium III processors.
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#if defined(HAVE_ALTIVEC)
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#include "SFMT-alti.h"
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#elif defined(HAVE_SSE2)
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#include "SFMT-sse2.h"
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#endif
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/**
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* This function simulate a 64-bit index of LITTLE ENDIAN
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* in BIG ENDIAN machine.
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*/
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#ifdef ONLY64
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inline static int idxof(int i) {
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return i ^ 1;
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}
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#else
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inline static int idxof(int i) {
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return i;
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}
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#endif
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/**
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* This function simulates SIMD 128-bit right shift by the standard C.
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* The 128-bit integer given in in is shifted by (shift * 8) bits.
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* This function simulates the LITTLE ENDIAN SIMD.
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* @param out the output of this function
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* @param in the 128-bit data to be shifted
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* @param shift the shift value
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*/
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#ifdef ONLY64
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inline static void rshift128(w128_t *out, w128_t const *in, int shift) {
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QWORD th, tl, oh, ol;
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th = ((QWORD)in->u[2] << 32) | ((QWORD)in->u[3]);
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tl = ((QWORD)in->u[0] << 32) | ((QWORD)in->u[1]);
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oh = th >> (shift * 8);
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ol = tl >> (shift * 8);
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ol |= th << (64 - shift * 8);
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out->u[0] = (DWORD)(ol >> 32);
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out->u[1] = (DWORD)ol;
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out->u[2] = (DWORD)(oh >> 32);
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out->u[3] = (DWORD)oh;
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}
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#else
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inline static void rshift128(w128_t *out, w128_t const *in, int shift) {
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QWORD th, tl, oh, ol;
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th = ((QWORD)in->u[3] << 32) | ((QWORD)in->u[2]);
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tl = ((QWORD)in->u[1] << 32) | ((QWORD)in->u[0]);
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oh = th >> (shift * 8);
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ol = tl >> (shift * 8);
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ol |= th << (64 - shift * 8);
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out->u[1] = (DWORD)(ol >> 32);
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out->u[0] = (DWORD)ol;
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out->u[3] = (DWORD)(oh >> 32);
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out->u[2] = (DWORD)oh;
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}
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#endif
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/**
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* This function simulates SIMD 128-bit left shift by the standard C.
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* The 128-bit integer given in in is shifted by (shift * 8) bits.
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* This function simulates the LITTLE ENDIAN SIMD.
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* @param out the output of this function
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* @param in the 128-bit data to be shifted
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* @param shift the shift value
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*/
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#ifdef ONLY64
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inline static void lshift128(w128_t *out, w128_t const *in, int shift) {
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QWORD th, tl, oh, ol;
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th = ((QWORD)in->u[2] << 32) | ((QWORD)in->u[3]);
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tl = ((QWORD)in->u[0] << 32) | ((QWORD)in->u[1]);
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oh = th << (shift * 8);
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ol = tl << (shift * 8);
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oh |= tl >> (64 - shift * 8);
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out->u[0] = (DWORD)(ol >> 32);
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out->u[1] = (DWORD)ol;
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out->u[2] = (DWORD)(oh >> 32);
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out->u[3] = (DWORD)oh;
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}
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#else
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inline static void lshift128(w128_t *out, w128_t const *in, int shift) {
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QWORD th, tl, oh, ol;
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th = ((QWORD)in->u[3] << 32) | ((QWORD)in->u[2]);
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tl = ((QWORD)in->u[1] << 32) | ((QWORD)in->u[0]);
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oh = th << (shift * 8);
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ol = tl << (shift * 8);
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oh |= tl >> (64 - shift * 8);
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out->u[1] = (DWORD)(ol >> 32);
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out->u[0] = (DWORD)ol;
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out->u[3] = (DWORD)(oh >> 32);
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out->u[2] = (DWORD)oh;
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}
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#endif
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/**
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* This function represents the recursion formula.
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* @param r output
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* @param a a 128-bit part of the internal state array
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* @param b a 128-bit part of the internal state array
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* @param c a 128-bit part of the internal state array
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* @param d a 128-bit part of the internal state array
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*/
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#if (!defined(HAVE_ALTIVEC)) && (!defined(HAVE_SSE2))
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#ifdef ONLY64
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inline static void do_recursion(w128_t *r, w128_t *a, w128_t *b, w128_t *c,
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w128_t *d) {
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w128_t x;
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w128_t y;
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lshift128(&x, a, SL2);
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rshift128(&y, c, SR2);
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r->u[0] = a->u[0] ^ x.u[0] ^ ((b->u[0] >> SR1) & MSK2) ^ y.u[0]
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^ (d->u[0] << SL1);
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r->u[1] = a->u[1] ^ x.u[1] ^ ((b->u[1] >> SR1) & MSK1) ^ y.u[1]
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^ (d->u[1] << SL1);
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r->u[2] = a->u[2] ^ x.u[2] ^ ((b->u[2] >> SR1) & MSK4) ^ y.u[2]
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^ (d->u[2] << SL1);
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r->u[3] = a->u[3] ^ x.u[3] ^ ((b->u[3] >> SR1) & MSK3) ^ y.u[3]
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^ (d->u[3] << SL1);
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}
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#else
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inline static void do_recursion(w128_t *r, w128_t *a, w128_t *b, w128_t *c,
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w128_t *d) {
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w128_t x;
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w128_t y;
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lshift128(&x, a, SL2);
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rshift128(&y, c, SR2);
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r->u[0] = a->u[0] ^ x.u[0] ^ ((b->u[0] >> SR1) & MSK1) ^ y.u[0]
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^ (d->u[0] << SL1);
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r->u[1] = a->u[1] ^ x.u[1] ^ ((b->u[1] >> SR1) & MSK2) ^ y.u[1]
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^ (d->u[1] << SL1);
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r->u[2] = a->u[2] ^ x.u[2] ^ ((b->u[2] >> SR1) & MSK3) ^ y.u[2]
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^ (d->u[2] << SL1);
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r->u[3] = a->u[3] ^ x.u[3] ^ ((b->u[3] >> SR1) & MSK4) ^ y.u[3]
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^ (d->u[3] << SL1);
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}
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#endif
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#endif
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#if (!defined(HAVE_ALTIVEC)) && (!defined(HAVE_SSE2))
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/**
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* This function fills the internal state array with pseudorandom
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* integers.
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*/
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void FRandom::GenRandAll()
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{
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int i;
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w128_t *r1, *r2;
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r1 = &sfmt.w128[SFMT::N - 2];
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r2 = &sfmt.w128[SFMT::N - 1];
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for (i = 0; i < SFMT::N - POS1; i++) {
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do_recursion(&sfmt.w128[i], &sfmt.w128[i], &sfmt.w128[i + POS1], r1, r2);
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r1 = r2;
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r2 = &sfmt.w128[i];
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}
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for (; i < SFMT::N; i++) {
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do_recursion(&sfmt.w128[i], &sfmt.w128[i], &sfmt.w128[i + POS1 - SFMT::N], r1, r2);
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r1 = r2;
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r2 = &sfmt.w128[i];
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}
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}
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/**
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* This function fills the user-specified array with pseudorandom
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* integers.
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*
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* @param array an 128-bit array to be filled by pseudorandom numbers.
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* @param size number of 128-bit pseudorandom numbers to be generated.
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*/
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void FRandom::GenRandArray(w128_t *array, int size)
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{
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int i, j;
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w128_t *r1, *r2;
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r1 = &sfmt.w128[SFMT::N - 2];
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r2 = &sfmt.w128[SFMT::N - 1];
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for (i = 0; i < SFMT::N - POS1; i++) {
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do_recursion(&array[i], &sfmt.w128[i], &sfmt.w128[i + POS1], r1, r2);
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r1 = r2;
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r2 = &array[i];
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}
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for (; i < SFMT::N; i++) {
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do_recursion(&array[i], &sfmt.w128[i], &array[i + POS1 - SFMT::N], r1, r2);
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r1 = r2;
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r2 = &array[i];
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}
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for (; i < size - SFMT::N; i++) {
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do_recursion(&array[i], &array[i - SFMT::N], &array[i + POS1 - SFMT::N], r1, r2);
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r1 = r2;
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r2 = &array[i];
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}
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for (j = 0; j < 2 * SFMT::N - size; j++) {
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sfmt.w128[j] = array[j + size - SFMT::N];
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}
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for (; i < size; i++, j++) {
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do_recursion(&array[i], &array[i - SFMT::N], &array[i + POS1 - SFMT::N], r1, r2);
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r1 = r2;
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r2 = &array[i];
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sfmt.w128[j] = array[i];
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}
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}
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#endif
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#if defined(BIG_ENDIAN64) && !defined(ONLY64) && !defined(HAVE_ALTIVEC)
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inline static void swap(w128_t *array, int size) {
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int i;
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DWORD x, y;
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for (i = 0; i < size; i++) {
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x = array[i].u[0];
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y = array[i].u[2];
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array[i].u[0] = array[i].u[1];
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array[i].u[2] = array[i].u[3];
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array[i].u[1] = x;
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array[i].u[3] = y;
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}
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}
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#endif
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/**
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* This function represents a function used in the initialization
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* by init_by_array
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* @param x 32-bit integer
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* @return 32-bit integer
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*/
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static DWORD func1(DWORD x)
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{
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return (x ^ (x >> 27)) * (DWORD)1664525UL;
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}
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/**
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* This function represents a function used in the initialization
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* by init_by_array
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* @param x 32-bit integer
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* @return 32-bit integer
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*/
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static DWORD func2(DWORD x)
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{
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return (x ^ (x >> 27)) * (DWORD)1566083941UL;
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}
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/**
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* This function certificate the period of 2^{MEXP}
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*/
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void FRandom::PeriodCertification()
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{
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int inner = 0;
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int i, j;
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DWORD work;
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for (i = 0; i < 4; i++)
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inner ^= sfmt.u[idxof(i)] & parity[i];
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for (i = 16; i > 0; i >>= 1)
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inner ^= inner >> i;
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inner &= 1;
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/* check OK */
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if (inner == 1) {
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return;
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}
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/* check NG, and modification */
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for (i = 0; i < 4; i++) {
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work = 1;
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for (j = 0; j < 32; j++) {
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if ((work & parity[i]) != 0) {
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sfmt.u[idxof(i)] ^= work;
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return;
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}
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work = work << 1;
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}
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}
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}
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/*----------------
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PUBLIC FUNCTIONS
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----------------*/
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/**
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* This function returns the minimum size of array used for \b
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* fill_array32() function.
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* @return minimum size of array used for FillArray32() function.
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*/
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int FRandom::GetMinArraySize32()
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{
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return SFMT::N32;
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}
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/**
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* This function returns the minimum size of array used for \b
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* fill_array64() function.
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* @return minimum size of array used for FillArray64() function.
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*/
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int FRandom::GetMinArraySize64()
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{
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return SFMT::N64;
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}
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#ifndef ONLY64
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/**
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* This function generates and returns 32-bit pseudorandom number.
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* init_gen_rand or init_by_array must be called before this function.
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* @return 32-bit pseudorandom number
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*/
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unsigned int FRandom::GenRand32()
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{
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DWORD r;
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assert(initialized);
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if (idx >= SFMT::N32)
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{
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GenRandAll();
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idx = 0;
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}
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r = sfmt.u[idx++];
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return r;
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}
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#endif
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/**
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* This function generates and returns 64-bit pseudorandom number.
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* init_gen_rand or init_by_array must be called before this function.
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* The function gen_rand64 should not be called after gen_rand32,
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* unless an initialization is again executed.
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* @return 64-bit pseudorandom number
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*/
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QWORD FRandom::GenRand64()
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{
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#if defined(BIG_ENDIAN64) && !defined(ONLY64)
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DWORD r1, r2;
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#else
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QWORD r;
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#endif
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assert(initialized);
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assert(idx % 2 == 0);
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if (idx >= SFMT::N32)
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{
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GenRandAll();
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idx = 0;
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}
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#if defined(BIG_ENDIAN64) && !defined(ONLY64)
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r1 = sfmt.u[idx];
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r2 = sfmt.u[idx + 1];
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idx += 2;
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return ((QWORD)r2 << 32) | r1;
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#else
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r = sfmt.u64[idx / 2];
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idx += 2;
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return r;
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#endif
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}
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#ifndef ONLY64
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/**
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* This function generates pseudorandom 32-bit integers in the
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* specified array[] by one call. The number of pseudorandom integers
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* is specified by the argument size, which must be at least 624 and a
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* multiple of four. The generation by this function is much faster
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* than the following gen_rand function.
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*
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* For initialization, init_gen_rand or init_by_array must be called
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* before the first call of this function. This function can not be
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* used after calling gen_rand function, without initialization.
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*
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* @param array an array where pseudorandom 32-bit integers are filled
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* by this function. The pointer to the array must be \b "aligned"
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* (namely, must be a multiple of 16) in the SIMD version, since it
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* refers to the address of a 128-bit integer. In the standard C
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* version, the pointer is arbitrary.
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*
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* @param size the number of 32-bit pseudorandom integers to be
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* generated. size must be a multiple of 4, and greater than or equal
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* to (MEXP / 128 + 1) * 4.
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*
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* @note \b memalign or \b posix_memalign is available to get aligned
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* memory. Mac OSX doesn't have these functions, but \b malloc of OSX
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* returns the pointer to the aligned memory block.
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*/
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void FRandom::FillArray32(DWORD *array, int size)
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{
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assert(initialized);
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assert(idx == SFMT::N32);
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assert(size % 4 == 0);
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assert(size >= SFMT::N32);
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GenRandArray((w128_t *)array, size / 4);
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idx = SFMT::N32;
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}
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#endif
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/**
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* This function generates pseudorandom 64-bit integers in the
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* specified array[] by one call. The number of pseudorandom integers
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* is specified by the argument size, which must be at least 312 and a
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* multiple of two. The generation by this function is much faster
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* than the following gen_rand function.
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*
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* For initialization, init_gen_rand or init_by_array must be called
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* before the first call of this function. This function can not be
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* used after calling gen_rand function, without initialization.
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*
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* @param array an array where pseudorandom 64-bit integers are filled
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* by this function. The pointer to the array must be "aligned"
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* (namely, must be a multiple of 16) in the SIMD version, since it
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* refers to the address of a 128-bit integer. In the standard C
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* version, the pointer is arbitrary.
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*
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* @param size the number of 64-bit pseudorandom integers to be
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* generated. size must be a multiple of 2, and greater than or equal
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* to (MEXP / 128 + 1) * 2
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*
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|
* @note \b memalign or \b posix_memalign is available to get aligned
|
|
* memory. Mac OSX doesn't have these functions, but \b malloc of OSX
|
|
* returns the pointer to the aligned memory block.
|
|
*/
|
|
void FRandom::FillArray64(QWORD *array, int size)
|
|
{
|
|
assert(initialized);
|
|
assert(idx == SFMT::N32);
|
|
assert(size % 2 == 0);
|
|
assert(size >= SFMT::N64);
|
|
|
|
GenRandArray((w128_t *)array, size / 2);
|
|
idx = SFMT::N32;
|
|
|
|
#if defined(BIG_ENDIAN64) && !defined(ONLY64)
|
|
swap((w128_t *)array, size / 2);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* This function initializes the internal state array with a 32-bit
|
|
* integer seed.
|
|
*
|
|
* @param seed a 32-bit integer used as the seed.
|
|
*/
|
|
void FRandom::InitGenRand(DWORD seed)
|
|
{
|
|
int i;
|
|
|
|
sfmt.u[idxof(0)] = seed;
|
|
for (i = 1; i < SFMT::N32; i++)
|
|
{
|
|
sfmt.u[idxof(i)] = 1812433253UL * (sfmt.u[idxof(i - 1)]
|
|
^ (sfmt.u[idxof(i - 1)] >> 30))
|
|
+ i;
|
|
}
|
|
idx = SFMT::N32;
|
|
PeriodCertification();
|
|
#ifndef NDEBUG
|
|
initialized = 1;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* This function initializes the internal state array,
|
|
* with an array of 32-bit integers used as the seeds
|
|
* @param init_key the array of 32-bit integers, used as a seed.
|
|
* @param key_length the length of init_key.
|
|
*/
|
|
void FRandom::InitByArray(DWORD *init_key, int key_length)
|
|
{
|
|
int i, j, count;
|
|
DWORD r;
|
|
int lag;
|
|
int mid;
|
|
int size = SFMT::N * 4;
|
|
|
|
if (size >= 623) {
|
|
lag = 11;
|
|
} else if (size >= 68) {
|
|
lag = 7;
|
|
} else if (size >= 39) {
|
|
lag = 5;
|
|
} else {
|
|
lag = 3;
|
|
}
|
|
mid = (size - lag) / 2;
|
|
|
|
memset(&sfmt, 0x8b, sizeof(sfmt));
|
|
if (key_length + 1 > SFMT::N32) {
|
|
count = key_length + 1;
|
|
} else {
|
|
count = SFMT::N32;
|
|
}
|
|
r = func1(sfmt.u[idxof(0)] ^ sfmt.u[idxof(mid)] ^ sfmt.u[idxof(SFMT::N32 - 1)]);
|
|
sfmt.u[idxof(mid)] += r;
|
|
r += key_length;
|
|
sfmt.u[idxof(mid + lag)] += r;
|
|
sfmt.u[idxof(0)] = r;
|
|
|
|
count--;
|
|
for (i = 1, j = 0; (j < count) && (j < key_length); j++)
|
|
{
|
|
r = func1(sfmt.u[idxof(i)] ^ sfmt.u[idxof((i + mid) % SFMT::N32)] ^ sfmt.u[idxof((i + SFMT::N32 - 1) % SFMT::N32)]);
|
|
sfmt.u[idxof((i + mid) % SFMT::N32)] += r;
|
|
r += init_key[j] + i;
|
|
sfmt.u[idxof((i + mid + lag) % SFMT::N32)] += r;
|
|
sfmt.u[idxof(i)] = r;
|
|
i = (i + 1) % SFMT::N32;
|
|
}
|
|
for (; j < count; j++)
|
|
{
|
|
r = func1(sfmt.u[idxof(i)] ^ sfmt.u[idxof((i + mid) % SFMT::N32)] ^ sfmt.u[idxof((i + SFMT::N32 - 1) % SFMT::N32)]);
|
|
sfmt.u[idxof((i + mid) % SFMT::N32)] += r;
|
|
r += i;
|
|
sfmt.u[idxof((i + mid + lag) % SFMT::N32)] += r;
|
|
sfmt.u[idxof(i)] = r;
|
|
i = (i + 1) % SFMT::N32;
|
|
}
|
|
for (j = 0; j < SFMT::N32; j++)
|
|
{
|
|
r = func2(sfmt.u[idxof(i)] + sfmt.u[idxof((i + mid) % SFMT::N32)] + sfmt.u[idxof((i + SFMT::N32 - 1) % SFMT::N32)]);
|
|
sfmt.u[idxof((i + mid) % SFMT::N32)] ^= r;
|
|
r -= i;
|
|
sfmt.u[idxof((i + mid + lag) % SFMT::N32)] ^= r;
|
|
sfmt.u[idxof(i)] = r;
|
|
i = (i + 1) % SFMT::N32;
|
|
}
|
|
|
|
idx = SFMT::N32;
|
|
PeriodCertification();
|
|
#ifndef NDEBUG
|
|
initialized = 1;
|
|
#endif
|
|
}
|