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7371c4a516
cryptographically secure random number generator, if available, instead of the current time. - Changed the random number generator from Lee Killough's algorithm to the SFMT607 variant of the Mersenne Twister. SVN r1507 (trunk)
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/**
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* @file SFMT-sse2.h
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* @brief SIMD oriented Fast Mersenne Twister(SFMT) for Intel SSE2
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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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* @note We assume LITTLE ENDIAN in this file
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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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#ifndef SFMT_SSE2_H
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#define SFMT_SSE2_H
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PRE_ALWAYS static __m128i mm_recursion(__m128i *a, __m128i *b, __m128i c,
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__m128i d, __m128i mask) ALWAYSINLINE;
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/**
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* This function represents the recursion formula.
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* @param a a 128-bit part of the interal state array
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* @param b a 128-bit part of the interal state array
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* @param c a 128-bit part of the interal state array
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* @param d a 128-bit part of the interal state array
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* @param mask 128-bit mask
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* @return output
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*/
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PRE_ALWAYS static __m128i mm_recursion(__m128i *a, __m128i *b,
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__m128i c, __m128i d, __m128i mask) {
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__m128i v, x, y, z;
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x = _mm_load_si128(a);
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y = _mm_srli_epi32(*b, SR1);
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z = _mm_srli_si128(c, SR2);
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v = _mm_slli_epi32(d, SL1);
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z = _mm_xor_si128(z, x);
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z = _mm_xor_si128(z, v);
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x = _mm_slli_si128(x, SL2);
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y = _mm_and_si128(y, mask);
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z = _mm_xor_si128(z, x);
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z = _mm_xor_si128(z, y);
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return z;
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}
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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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inline static void gen_rand_all(void) {
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int i;
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__m128i r, r1, r2, mask;
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mask = _mm_set_epi32(MSK4, MSK3, MSK2, MSK1);
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r1 = _mm_load_si128(&sfmt[N - 2].si);
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r2 = _mm_load_si128(&sfmt[N - 1].si);
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for (i = 0; i < N - POS1; i++) {
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r = mm_recursion(&sfmt[i].si, &sfmt[i + POS1].si, r1, r2, mask);
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_mm_store_si128(&sfmt[i].si, r);
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r1 = r2;
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r2 = r;
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}
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for (; i < N; i++) {
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r = mm_recursion(&sfmt[i].si, &sfmt[i + POS1 - N].si, r1, r2, mask);
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_mm_store_si128(&sfmt[i].si, r);
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r1 = r2;
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r2 = r;
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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 pesudorandom numbers to be generated.
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*/
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inline static void gen_rand_array(w128_t *array, int size) {
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int i, j;
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__m128i r, r1, r2, mask;
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mask = _mm_set_epi32(MSK4, MSK3, MSK2, MSK1);
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r1 = _mm_load_si128(&sfmt[N - 2].si);
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r2 = _mm_load_si128(&sfmt[N - 1].si);
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for (i = 0; i < N - POS1; i++) {
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r = mm_recursion(&sfmt[i].si, &sfmt[i + POS1].si, r1, r2, mask);
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_mm_store_si128(&array[i].si, r);
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r1 = r2;
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r2 = r;
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}
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for (; i < N; i++) {
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r = mm_recursion(&sfmt[i].si, &array[i + POS1 - N].si, r1, r2, mask);
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_mm_store_si128(&array[i].si, r);
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r1 = r2;
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r2 = r;
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}
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/* main loop */
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for (; i < size - N; i++) {
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r = mm_recursion(&array[i - N].si, &array[i + POS1 - N].si, r1, r2,
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mask);
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_mm_store_si128(&array[i].si, r);
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r1 = r2;
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r2 = r;
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}
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for (j = 0; j < 2 * N - size; j++) {
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r = _mm_load_si128(&array[j + size - N].si);
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_mm_store_si128(&sfmt[j].si, r);
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}
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for (; i < size; i++) {
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r = mm_recursion(&array[i - N].si, &array[i + POS1 - N].si, r1, r2,
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mask);
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_mm_store_si128(&array[i].si, r);
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_mm_store_si128(&sfmt[j++].si, r);
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r1 = r2;
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r2 = r;
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}
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}
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#endif
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