fp_op_int64
_fp_pack(pfpsd, &us1, nrd, fp_op_int64);
_fp_unpack(pfpsd, &us1, nrs2, fp_op_int64);
_fp_unpack(pfpsd, &us1, nrs2, fp_op_int64);
_fp_unpack(pfpsd, &us1, nrs2, fp_op_int64);
case fp_op_int64:
case fp_op_int64: