tf_fppt
s->tf_fppt, s->tf_fprh, s->tf_fprl, s->tf_fpit);
rd = frame->tf_fppt & 0x1f;
opcode = (frame->tf_fppt >> 11) & 0x1f;
t1 = (frame->tf_fppt >> 9) & 0x03;
t2 = (frame->tf_fppt >> 7) & 0x03;
td = (frame->tf_fppt >> 5) & 0x03;
f->tf_fppt, f->tf_fprh, f->tf_fprl, f->tf_fpit);