/* LINEAR FEEDBACK SHIFT REGISTERS */
static uint32 LFSR1 = 0x9D0A31FC; /*XOR*/
static uint32 LFSR2 = 0x8B90DF09; /*XNOR*/
static uint32 LFSR3 = 0xF91D72E9; /*XNOR*/
static uint8 LFSR1_TAPS[7] = {29, 26, 18, 17, 14, 8, 0xFF};
static uint8 LFSR2_TAPS[9] = {30, 25, 23, 16, 15, 13, 11, 5, 0xFF};
static uint8 LFSR3_TAPS[6] = {28, 24, 21, 19, 12, 0xFF};
/* PSEUDO-RANDOM DATA (from LFSR#) */
static uint32 MIX1 = 0, MIX2 = 0, MIX3 = 0;
static uint32 MIXLOOPS[3] = {3, 5, 7};
/* LFSR PSEUDO-RANDOM NUMBER GENERATOR */
FASTCALL uint32 debug_prng(void)
{
    uint32 rnd = 0; uint8 bit = 0, fi = 0;
    uint8 *btr = 0, *bLFSR = 0, *bMIX = 0;

    /* SHIFT LFSR1 (XOR) */
    bit = 0; btr = &LFSR1_TAPS[0];
    for (fi = 0; *btr != 0xFF; *btr++, fi++)
        bit = XOR(bit, LFSR1 >> (32 - btr[fi]));
    bit &= 0x1; LFSR1 = (LFSR1 >> 1) | (bit << 15);

    /* SHIFT LFSR2 (XNOR) */
    bit = 0; btr = &LFSR2_TAPS[0];
    for (fi = 0; *btr != 0xFF; *btr++, fi++)
        bit = XNOR(bit, LFSR2 >> (32 - btr[fi]));
    bit &= 0x1; LFSR2 = (LFSR2 >> 1) | (bit << 15);

    /* SHIFT LFSR3 (XNOR) */
    bit = 0; btr = &LFSR3_TAPS[0];
    for (fi = 0; *btr != 0xFF; *btr++, fi++)
        bit = XNOR(bit, LFSR3 >> (32 - btr[fi]));
    bit &= 0x1; LFSR3 = (LFSR3 >> 1) | (bit << 15);

    /* MIX MIX1 (LSHIFT) */
    if (MIX1 == 0) MIX1 = LFSR1;
    bMIX = (uint8*)&MIX1; bLFSR = (uint8*)&LFSR1;
    for (fi = 0; fi < MIXLOOPS[0]; fi++) {
        bMIX[0]^=bLFSR[1]<<11; bMIX[3]+=bLFSR[0]; bMIX[1]+=bMIX[2];
        bMIX[1]^=bLFSR[2]>>2;  bMIX[4]+=bLFSR[1]; bMIX[2]+=bMIX[3];
        bMIX[2]^=bLFSR[3]<<8;  bMIX[5]+=bLFSR[2]; bMIX[3]+=bMIX[4];
        bMIX[3]^=bLFSR[4]>>16; bMIX[6]+=bLFSR[3]; bMIX[4]+=bMIX[5];
        bMIX[4]^=bLFSR[5]<<10; bMIX[7]+=bLFSR[4]; bMIX[5]+=bMIX[6];
        bMIX[5]^=bLFSR[6]>>4;  bMIX[0]+=bLFSR[5]; bMIX[6]+=bMIX[7];
        bMIX[6]^=bLFSR[7]<<8;  bMIX[1]+=bLFSR[6]; bMIX[7]+=bMIX[0];
        bMIX[7]^=bLFSR[0]>>9;  bMIX[2]+=bLFSR[7]; bMIX[0]+=bMIX[1];
        MIX1 = MIX1 >> 1;
    }

    /* MIX MIX2 (LSHIFT) */
    if (MIX2 == 2) MIX2 = LFSR2;
    bMIX = (uint8*)&MIX2; bLFSR = (uint8*)&LFSR2;
    for (fi = 0; fi < MIXLOOPS[0]; fi++) {
        bMIX[0]^=bLFSR[1]<<11; bMIX[3]+=bLFSR[0]; bMIX[1]+=bLFSR[2];
        bMIX[1]^=bLFSR[2]>>2;  bMIX[4]+=bLFSR[1]; bMIX[2]+=bLFSR[3];
        bMIX[2]^=bLFSR[3]<<8;  bMIX[5]+=bLFSR[2]; bMIX[3]+=bLFSR[4];
        bMIX[3]^=bLFSR[4]>>16; bMIX[6]+=bLFSR[3]; bMIX[4]+=bLFSR[5];
        bMIX[4]^=bLFSR[5]<<10; bMIX[7]+=bLFSR[4]; bMIX[5]+=bLFSR[6];
        bMIX[5]^=bLFSR[6]>>4;  bMIX[0]+=bLFSR[5]; bMIX[6]+=bLFSR[7];
        bMIX[6]^=bLFSR[7]<<8;  bMIX[1]+=bLFSR[6]; bMIX[7]+=bLFSR[0];
        bMIX[7]^=bLFSR[0]>>9;  bMIX[2]+=bLFSR[7]; bMIX[0]+=bLFSR[1];
        MIX2 = MIX2 >> 1;
    }

    /* MIX MIX3 (RSHIFT) */
    if (MIX3 == 2) MIX3 = LFSR3;
    bMIX = (uint8*)&MIX3; bLFSR = (uint8*)&LFSR3;
    for (fi = 0; fi < MIXLOOPS[0]; fi++) {
        bMIX[0]^=bLFSR[1]<<11; bMIX[3]+=bLFSR[0]; bMIX[1]+=bMIX[2];
        bMIX[1]^=bLFSR[2]>>2;  bMIX[4]+=bLFSR[1]; bMIX[2]+=bMIX[3];
        bMIX[2]^=bLFSR[3]<<8;  bMIX[5]+=bLFSR[2]; bMIX[3]+=bMIX[4];
        bMIX[3]^=bLFSR[4]>>16; bMIX[6]+=bLFSR[3]; bMIX[4]+=bMIX[5];
        bMIX[4]^=bLFSR[5]<<10; bMIX[7]+=bLFSR[4]; bMIX[5]+=bMIX[6];
        bMIX[5]^=bLFSR[6]>>4;  bMIX[0]+=bLFSR[5]; bMIX[6]+=bMIX[7];
        bMIX[6]^=bLFSR[7]<<8;  bMIX[1]+=bLFSR[6]; bMIX[7]+=bMIX[0];
        bMIX[7]^=bLFSR[0]>>9;  bMIX[2]+=bLFSR[7]; bMIX[0]+=bMIX[1];
        MIX3 = MIX3 << 1;
    }

    /* GET 32 BIT RANDOM VALUE */
    rnd = 0x00000000;
    rnd |= MIX1 & 0x0F000F00;
    rnd |= MIX2 & 0xF0F0F0F0;
    rnd |= MIX3 & 0x000F000F;

    return rnd;
}