st_swap64
st_swap64(num_bits, data64 + 7);
st_swap64(num_bits, data64 + 15);
st_swap64(num_bits, data64 + 15);
st_swap64(num_bits, data64 + 31);
st_swap64(s64[j], d64 + j);
st_swap64(s64[j], d64 + j);
#define FIX_ENDIAN64(x) st_swap64(x)