I found this cool random generator on rgba’s website. rgba is a wellknown demoscene group specialized in 4k prods. This random generator is used in their prods:

static unsigned int mirand = 1;
float sfrand( void )
{
    unsigned int a;
    mirand *= 16807;
    a = (mirand&0x007fffff) | 0x40000000;
    return( *((float*)&a) - 3.0f );
}

It produces values in the range [-1.0; 1.0].

You can find the making of this random gen HERE.