32-bit single state xorshift with extra mixing

// no failures from small crush,
// one questionable from small crush (bit reversed)
//   6  MaxOft
// failure from crush
//  72  LinearComp, r = 29 

uint32_t xorshift32ma(void)
{
  int s0  = state;

  state ^= (state << 13);
  state ^= (state >> 17);
  state ^= (state <<  5);

  return (state*1597334677) + s0;
}

// small crush 
//  9  HammingIndep  (questionable pvalue=0.9994)
// failure from crush
//  11  BirthdaySpacings, t = 2 
//  72  LinearComp, r = 29 
uint32_t xorshift32am(void)
{
  int s0  = state*1597334677;

  state ^= (state << 13);
  state ^= (state >> 17);
  state ^= (state <<  5);

  return state + s0;
}

// small crush = pass
// small cruch bit reversed = pass
// failure from crush
// 72  LinearComp, r = 29 
uint32_t xorshift32max(void)
{
  int s0  = __builtin_bswap32(state);

  state ^= (state << 13);
  state ^= (state >> 17);
  state ^= (state <<  5);

  return (state*1597334677) + s0;
}

// from crush:
// 1  SerialOver, t = 2     1- 9.4e-8
uint32_t xorshift32amx(void)
{
  int s0  = __builtin_bswap32(state*1597334677);

  state ^= (state << 13);
  state ^= (state >> 17);
  state ^= (state <<  5);

  return state + s0;
}