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136 lines
4.0 KiB
136 lines
4.0 KiB
/*!
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\file
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\brief Various routines for providing portable 32 and 64 bit random number
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generators.
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\date Started 5/17/2007
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\author George
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\version\verbatim $Id: random.c 18796 2015-06-02 11:39:45Z karypis $ \endverbatim
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*/
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#include <GKlib.h>
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/*************************************************************************/
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/*! Create the various random number functions */
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/*************************************************************************/
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GK_MKRANDOM(gk_c, size_t, char)
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GK_MKRANDOM(gk_i, size_t, int)
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GK_MKRANDOM(gk_i32, size_t, int32_t)
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GK_MKRANDOM(gk_f, size_t, float)
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GK_MKRANDOM(gk_d, size_t, double)
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GK_MKRANDOM(gk_idx, size_t, gk_idx_t)
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GK_MKRANDOM(gk_z, size_t, ssize_t)
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GK_MKRANDOM(gk_zu, size_t, size_t)
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/*************************************************************************/
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/*! GKlib's built in random number generator for portability across
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different architectures */
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/*************************************************************************/
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#ifdef USE_GKRAND
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/*
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A C-program for MT19937-64 (2004/9/29 version).
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Coded by Takuji Nishimura and Makoto Matsumoto.
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This is a 64-bit version of Mersenne Twister pseudorandom number
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generator.
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Before using, initialize the state by using init_genrand64(seed)
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or init_by_array64(init_key, key_length).
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Copyright (C) 2004, Makoto Matsumoto and Takuji Nishimura,
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All rights reserved.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define NN 312
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#define MM 156
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#define MATRIX_A 0xB5026F5AA96619E9ULL
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#define UM 0xFFFFFFFF80000000ULL /* Most significant 33 bits */
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#define LM 0x7FFFFFFFULL /* Least significant 31 bits */
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/* The array for the state vector */
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static uint64_t mt[NN];
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/* mti==NN+1 means mt[NN] is not initialized */
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static int mti=NN+1;
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#endif /* USE_GKRAND */
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/* initializes mt[NN] with a seed */
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void gk_randinit(uint64_t seed)
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{
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#ifdef USE_GKRAND
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mt[0] = seed;
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for (mti=1; mti<NN; mti++)
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mt[mti] = (6364136223846793005ULL * (mt[mti-1] ^ (mt[mti-1] >> 62)) + mti);
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#else
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srand((unsigned int) seed);
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#endif
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}
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/* generates a random number on [0, 2^64-1]-interval */
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uint64_t gk_randint64(void)
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{
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#ifdef USE_GKRAND
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int i;
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unsigned long long x;
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static uint64_t mag01[2]={0ULL, MATRIX_A};
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if (mti >= NN) { /* generate NN words at one time */
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/* if init_genrand64() has not been called, */
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/* a default initial seed is used */
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if (mti == NN+1)
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gk_randinit(5489ULL);
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for (i=0; i<NN-MM; i++) {
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x = (mt[i]&UM)|(mt[i+1]&LM);
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mt[i] = mt[i+MM] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
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}
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for (; i<NN-1; i++) {
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x = (mt[i]&UM)|(mt[i+1]&LM);
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mt[i] = mt[i+(MM-NN)] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
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}
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x = (mt[NN-1]&UM)|(mt[0]&LM);
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mt[NN-1] = mt[MM-1] ^ (x>>1) ^ mag01[(int)(x&1ULL)];
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mti = 0;
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}
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x = mt[mti++];
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x ^= (x >> 29) & 0x5555555555555555ULL;
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x ^= (x << 17) & 0x71D67FFFEDA60000ULL;
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x ^= (x << 37) & 0xFFF7EEE000000000ULL;
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x ^= (x >> 43);
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return x & 0x7FFFFFFFFFFFFFFF;
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#else
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return (uint64_t)(((uint64_t) rand()) << 32 | ((uint64_t) rand()));
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#endif
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}
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/* generates a random number on [0, 2^32-1]-interval */
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uint32_t gk_randint32(void)
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{
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#ifdef USE_GKRAND
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return (uint32_t)(gk_randint64() & 0x7FFFFFFF);
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#else
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return (uint32_t)rand();
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#endif
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}
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