tf_fprh
s->tf_fppt, s->tf_fprh, s->tf_fprl, s->tf_fpit);
sign = (frame->tf_fprh & FPRH_SIGN) != 0;
mant32 = (frame->tf_fprh & FPRH_MANTH_MASK);
if (frame->tf_fprh & FPRH_ADDONE) {
mant64 = frame->tf_fprh & FPRH_MANTH_MASK;
if (frame->tf_fprh & FPRH_ADDONE) {
f->tf_fppt, f->tf_fprh, f->tf_fprl, f->tf_fpit);