rewire_rng.c

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#include "rewire_rng.h"
 
ABC_NAMESPACE_IMPL_START
 
unsigned Random_Int(int fReset) {
    static unsigned int m_z = NUMBER1;
    static unsigned int m_w = NUMBER2;
    if (fReset) {
        m_z = NUMBER1;
        m_w = NUMBER2;
    } 
    m_z = 36969 * (m_z & 65535) + (m_z >> 16);
    m_w = 18000 * (m_w & 65535) + (m_w >> 16);
    return (m_z << 16) + m_w;
}
 
word Random_Word(int fReset) {
    return ((word)Random_Int(fReset) << 32) | ((word)Random_Int(fReset) << 0);
}
 
// This procedure should be called once with Seed > 0 to initialize the generator.
// After initialization, the generator should be always called with Seed == 0.
unsigned Random_Num(int Seed) {
    static unsigned RandMask = 0;
    if (Seed == 0)
        return RandMask ^ Random_Int(0);
    RandMask = Random_Int(1);
    for (int i = 0; i < Seed; i++)
        RandMask = Random_Int(0);
    return RandMask;
}
 
ABC_NAMESPACE_IMPL_END