I've noticed a couple of bugs or other anomalies, and the patches below are the outcome of trying to rectify these. 1: restrict use of register aliases 2: also allow %st(N) in CFI directives 3: enable 2nd CFI test 4: restrict %tr<N> visibility 5: simplify check_byte_reg() 6: also handle %k<N> and %bnd<N> in debugging helpers Jan