(* Title: HOL/Library/word_setup.ML ID: $Id: word_setup.ML,v 1.5 2005/06/20 20:13:59 wenzelm Exp $ Author: Sebastian Skalberg (TU Muenchen) comments containing lcp are the removal of fast_bv_of_nat. *) local fun is_const_bool (Const("True",_)) = true | is_const_bool (Const("False",_)) = true | is_const_bool _ = false fun is_const_bit (Const("Word.bit.Zero",_)) = true | is_const_bit (Const("Word.bit.One",_)) = true | is_const_bit _ = false fun num_is_usable (Const("Numeral.Pls",_)) = true | num_is_usable (Const("Numeral.Min",_)) = false | num_is_usable (Const("Numeral.Bit",_) $ w $ b) = num_is_usable w andalso is_const_bool b | num_is_usable _ = false fun vec_is_usable (Const("List.list.Nil",_)) = true | vec_is_usable (Const("List.list.Cons",_) $ b $ bs) = vec_is_usable bs andalso is_const_bit b | vec_is_usable _ = false fun add_word thy = let (*lcp** val fast1_th = PureThy.get_thm thy "Word.fast_nat_to_bv_def"**) val fast2_th = PureThy.get_thm thy (Name "Word.fast_bv_to_nat_def") (*lcp** fun f sg thms (Const("Word.nat_to_bv",_) $ (Const("Numeral.number_of",_) $ t)) = if num_is_usable t then SOME (Drule.cterm_instantiate [(cterm_of sg (Var(("w",0),Type("Numeral.bin",[]))),cterm_of sg t)] fast1_th) else NONE | f _ _ _ = NONE **) fun g sg thms (Const("Word.bv_to_nat",_) $ (t as (Const("List.list.Cons",_) $ _ $ _))) = if vec_is_usable t then SOME (Drule.cterm_instantiate [(cterm_of sg (Var(("bs",0),Type("List.list",[Type("Word.bit",[])]))),cterm_of sg t)] fast2_th) else NONE | g _ _ _ = NONE (*lcp** val simproc1 = Simplifier.simproc (sign_of thy) "nat_to_bv" ["Word.nat_to_bv (number_of ?w)"] f ***) val simproc2 = Simplifier.simproc (sign_of thy) "bv_to_nat" ["Word.bv_to_nat (?x # ?xs)"] g in Simplifier.change_simpset_of (op addsimprocs) [(*lcp*simproc1,**)simproc2] thy end in val setup_word = [add_word] end