Remark eval_builtin_args_trivial:
forall (ge: RTL.genv) (rs: regset) sp m rl,
eval_builtin_args ge (fun r => rs#r) sp m (List.map (@BA reg) rl) rs##rl.

Theorem transl_expr_correct:
forall le a v,
eval_expr ge sp e m le a v ->
transl_expr_prop le a v.