author | wenzelm |
Wed, 31 Dec 2008 18:53:16 +0100 | |
changeset 29270 | 0eade173f77e |
parent 29258 | bce03c644efb |
child 29287 | 5b0bfd63b5da |
permissions | -rw-r--r-- |
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(* Title: HOL/Library/Efficient_Nat.thy |
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Author: Stefan Berghofer, Florian Haftmann, TU Muenchen |
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*) |
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header {* Implementation of natural numbers by target-language integers *} |
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theory Efficient_Nat |
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imports Code_Index Code_Integer |
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begin |
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text {* |
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When generating code for functions on natural numbers, the |
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canonical representation using @{term "0::nat"} and |
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@{term "Suc"} is unsuitable for computations involving large |
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numbers. The efficiency of the generated code can be improved |
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drastically by implementing natural numbers by target-language |
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integers. To do this, just include this theory. |
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*} |
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subsection {* Basic arithmetic *} |
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text {* |
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Most standard arithmetic functions on natural numbers are implemented |
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using their counterparts on the integers: |
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*} |
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code_datatype number_nat_inst.number_of_nat |
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lemma zero_nat_code [code, code inline]: |
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"0 = (Numeral0 :: nat)" |
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by simp |
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lemmas [code post] = zero_nat_code [symmetric] |
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lemma one_nat_code [code, code inline]: |
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"1 = (Numeral1 :: nat)" |
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by simp |
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lemmas [code post] = one_nat_code [symmetric] |
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lemma Suc_code [code]: |
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"Suc n = n + 1" |
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by simp |
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lemma plus_nat_code [code]: |
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"n + m = nat (of_nat n + of_nat m)" |
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by simp |
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lemma minus_nat_code [code]: |
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"n - m = nat (of_nat n - of_nat m)" |
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by simp |
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lemma times_nat_code [code]: |
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"n * m = nat (of_nat n * of_nat m)" |
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unfolding of_nat_mult [symmetric] by simp |
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text {* Specialized @{term "op div \<Colon> nat \<Rightarrow> nat \<Rightarrow> nat"} |
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and @{term "op mod \<Colon> nat \<Rightarrow> nat \<Rightarrow> nat"} operations. *} |
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definition divmod_aux :: "nat \<Rightarrow> nat \<Rightarrow> nat \<times> nat" where |
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[code del]: "divmod_aux = divmod" |
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lemma [code]: |
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"divmod n m = (if m = 0 then (0, n) else divmod_aux n m)" |
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unfolding divmod_aux_def divmod_div_mod by simp |
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lemma divmod_aux_code [code]: |
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"divmod_aux n m = (nat (of_nat n div of_nat m), nat (of_nat n mod of_nat m))" |
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unfolding divmod_aux_def divmod_div_mod zdiv_int [symmetric] zmod_int [symmetric] by simp |
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lemma eq_nat_code [code]: |
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"eq_class.eq n m \<longleftrightarrow> eq_class.eq (of_nat n \<Colon> int) (of_nat m)" |
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by (simp add: eq) |
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lemma eq_nat_refl [code nbe]: |
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"eq_class.eq (n::nat) n \<longleftrightarrow> True" |
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by (rule HOL.eq_refl) |
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lemma less_eq_nat_code [code]: |
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"n \<le> m \<longleftrightarrow> (of_nat n \<Colon> int) \<le> of_nat m" |
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by simp |
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lemma less_nat_code [code]: |
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"n < m \<longleftrightarrow> (of_nat n \<Colon> int) < of_nat m" |
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by simp |
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subsection {* Case analysis *} |
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text {* |
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Case analysis on natural numbers is rephrased using a conditional |
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expression: |
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*} |
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lemma [code, code unfold]: |
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"nat_case = (\<lambda>f g n. if n = 0 then f else g (n - 1))" |
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by (auto simp add: expand_fun_eq dest!: gr0_implies_Suc) |
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subsection {* Preprocessors *} |
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text {* |
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In contrast to @{term "Suc n"}, the term @{term "n + (1::nat)"} is no longer |
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a constructor term. Therefore, all occurrences of this term in a position |
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where a pattern is expected (i.e.\ on the left-hand side of a recursion |
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equation or in the arguments of an inductive relation in an introduction |
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rule) must be eliminated. |
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This can be accomplished by applying the following transformation rules: |
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*} |
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lemma Suc_if_eq: "(\<And>n. f (Suc n) = h n) \<Longrightarrow> f 0 = g \<Longrightarrow> |
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f n = (if n = 0 then g else h (n - 1))" |
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by (case_tac n) simp_all |
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lemma Suc_clause: "(\<And>n. P n (Suc n)) \<Longrightarrow> n \<noteq> 0 \<Longrightarrow> P (n - 1) n" |
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by (case_tac n) simp_all |
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text {* |
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The rules above are built into a preprocessor that is plugged into |
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the code generator. Since the preprocessor for introduction rules |
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does not know anything about modes, some of the modes that worked |
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for the canonical representation of natural numbers may no longer work. |
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*} |
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(*<*) |
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setup {* |
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let |
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fun remove_suc thy thms = |
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let |
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val vname = Name.variant (map fst |
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(fold (Term.add_var_names o Thm.full_prop_of) thms [])) "x"; |
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val cv = cterm_of thy (Var ((vname, 0), HOLogic.natT)); |
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fun lhs_of th = snd (Thm.dest_comb |
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(fst (Thm.dest_comb (snd (Thm.dest_comb (cprop_of th)))))); |
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fun rhs_of th = snd (Thm.dest_comb (snd (Thm.dest_comb (cprop_of th)))); |
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fun find_vars ct = (case term_of ct of |
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(Const ("Suc", _) $ Var _) => [(cv, snd (Thm.dest_comb ct))] |
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| _ $ _ => |
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let val (ct1, ct2) = Thm.dest_comb ct |
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in |
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map (apfst (fn ct => Thm.capply ct ct2)) (find_vars ct1) @ |
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map (apfst (Thm.capply ct1)) (find_vars ct2) |
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end |
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| _ => []); |
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val eqs = maps |
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(fn th => map (pair th) (find_vars (lhs_of th))) thms; |
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fun mk_thms (th, (ct, cv')) = |
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let |
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val th' = |
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Thm.implies_elim |
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(Conv.fconv_rule (Thm.beta_conversion true) |
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(Drule.instantiate' |
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[SOME (ctyp_of_term ct)] [SOME (Thm.cabs cv ct), |
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SOME (Thm.cabs cv' (rhs_of th)), NONE, SOME cv'] |
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@{thm Suc_if_eq})) (Thm.forall_intr cv' th) |
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in |
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case map_filter (fn th'' => |
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SOME (th'', singleton |
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(Variable.trade (K (fn [th'''] => [th''' RS th'])) (Variable.thm_context th'')) th'') |
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handle THM _ => NONE) thms of |
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[] => NONE |
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| thps => |
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let val (ths1, ths2) = split_list thps |
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in SOME (subtract Thm.eq_thm (th :: ths1) thms @ ths2) end |
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end |
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in case get_first mk_thms eqs of |
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NONE => thms |
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| SOME x => remove_suc thy x |
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end; |
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fun eqn_suc_preproc thy ths = |
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let |
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val dest = fst o HOLogic.dest_eq o HOLogic.dest_Trueprop o prop_of; |
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fun contains_suc t = member (op =) (OldTerm.term_consts t) @{const_name Suc}; |
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in |
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if forall (can dest) ths andalso |
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exists (contains_suc o dest) ths |
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then remove_suc thy ths else ths |
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end; |
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fun remove_suc_clause thy thms = |
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let |
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val vname = Name.variant (map fst |
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(fold (Term.add_var_names o Thm.full_prop_of) thms [])) "x"; |
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fun find_var (t as Const (@{const_name Suc}, _) $ (v as Var _)) = SOME (t, v) |
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| find_var (t $ u) = (case find_var t of NONE => find_var u | x => x) |
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| find_var _ = NONE; |
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fun find_thm th = |
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let val th' = Conv.fconv_rule ObjectLogic.atomize th |
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in Option.map (pair (th, th')) (find_var (prop_of th')) end |
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in |
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case get_first find_thm thms of |
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NONE => thms |
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| SOME ((th, th'), (Sucv, v)) => |
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let |
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val cert = cterm_of (Thm.theory_of_thm th); |
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val th'' = ObjectLogic.rulify (Thm.implies_elim |
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(Conv.fconv_rule (Thm.beta_conversion true) |
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(Drule.instantiate' [] |
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[SOME (cert (lambda v (Abs ("x", HOLogic.natT, |
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abstract_over (Sucv, |
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HOLogic.dest_Trueprop (prop_of th')))))), |
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SOME (cert v)] @{thm Suc_clause})) |
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(Thm.forall_intr (cert v) th')) |
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in |
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remove_suc_clause thy (map (fn th''' => |
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if (op = o pairself prop_of) (th''', th) then th'' else th''') thms) |
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end |
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end; |
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fun clause_suc_preproc thy ths = |
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let |
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val dest = fst o HOLogic.dest_mem o HOLogic.dest_Trueprop |
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in |
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if forall (can (dest o concl_of)) ths andalso |
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exists (fn th => member (op =) (foldr OldTerm.add_term_consts |
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[] (map_filter (try dest) (concl_of th :: prems_of th))) "Suc") ths |
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then remove_suc_clause thy ths else ths |
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end; |
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fun lift f thy eqns1 = |
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let |
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val eqns2 = burrow_fst Drule.zero_var_indexes_list eqns1; |
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val thms3 = try (map fst |
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#> map (fn thm => thm RS @{thm meta_eq_to_obj_eq}) |
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#> f thy |
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#> map (fn thm => thm RS @{thm eq_reflection}) |
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#> map (Conv.fconv_rule Drule.beta_eta_conversion)) eqns2; |
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val thms4 = Option.map Drule.zero_var_indexes_list thms3; |
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in case thms4 |
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of NONE => NONE |
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| SOME thms4 => if Thm.eq_thms (map fst eqns2, thms4) |
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then NONE else SOME (map (apfst (AxClass.overload thy) o Code_Unit.mk_eqn thy) thms4) |
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end |
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in |
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Codegen.add_preprocessor eqn_suc_preproc |
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#> Codegen.add_preprocessor clause_suc_preproc |
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#> Code.add_functrans ("eqn_Suc", lift eqn_suc_preproc) |
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#> Code.add_functrans ("clause_Suc", lift clause_suc_preproc) |
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end; |
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*} |
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(*>*) |
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subsection {* Target language setup *} |
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text {* |
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For ML, we map @{typ nat} to target language integers, where we |
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assert that values are always non-negative. |
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*} |
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code_type nat |
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(SML "IntInf.int") |
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(OCaml "Big'_int.big'_int") |
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types_code |
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nat ("int") |
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attach (term_of) {* |
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val term_of_nat = HOLogic.mk_number HOLogic.natT; |
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*} |
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attach (test) {* |
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fun gen_nat i = |
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let val n = random_range 0 i |
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in (n, fn () => term_of_nat n) end; |
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*} |
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text {* |
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For Haskell we define our own @{typ nat} type. The reason |
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is that we have to distinguish type class instances |
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for @{typ nat} and @{typ int}. |
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*} |
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code_include Haskell "Nat" {* |
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newtype Nat = Nat Integer deriving (Show, Eq); |
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instance Num Nat where { |
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fromInteger k = Nat (if k >= 0 then k else 0); |
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Nat n + Nat m = Nat (n + m); |
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Nat n - Nat m = fromInteger (n - m); |
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Nat n * Nat m = Nat (n * m); |
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abs n = n; |
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signum _ = 1; |
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negate n = error "negate Nat"; |
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}; |
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instance Ord Nat where { |
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Nat n <= Nat m = n <= m; |
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Nat n < Nat m = n < m; |
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}; |
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instance Real Nat where { |
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toRational (Nat n) = toRational n; |
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}; |
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instance Enum Nat where { |
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toEnum k = fromInteger (toEnum k); |
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fromEnum (Nat n) = fromEnum n; |
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}; |
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instance Integral Nat where { |
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toInteger (Nat n) = n; |
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divMod n m = quotRem n m; |
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quotRem (Nat n) (Nat m) = (Nat k, Nat l) where (k, l) = quotRem n m; |
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}; |
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*} |
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code_reserved Haskell Nat |
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code_type nat |
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(Haskell "Nat") |
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code_instance nat :: eq |
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(Haskell -) |
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text {* |
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Natural numerals. |
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*} |
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lemma [code inline, symmetric, code post]: |
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"nat (number_of i) = number_nat_inst.number_of_nat i" |
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-- {* this interacts as desired with @{thm nat_number_of_def} *} |
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by (simp add: number_nat_inst.number_of_nat) |
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setup {* |
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fold (Numeral.add_code @{const_name number_nat_inst.number_of_nat} |
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true false) ["SML", "OCaml", "Haskell"] |
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*} |
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text {* |
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Since natural numbers are implemented |
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using integers in ML, the coercion function @{const "of_nat"} of type |
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@{typ "nat \<Rightarrow> int"} is simply implemented by the identity function. |
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For the @{const "nat"} function for converting an integer to a natural |
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number, we give a specific implementation using an ML function that |
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returns its input value, provided that it is non-negative, and otherwise |
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returns @{text "0"}. |
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*} |
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definition |
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int :: "nat \<Rightarrow> int" |
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where |
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[code del]: "int = of_nat" |
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lemma int_code' [code]: |
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"int (number_of l) = (if neg (number_of l \<Colon> int) then 0 else number_of l)" |
347 |
unfolding int_nat_number_of [folded int_def] .. |
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lemma nat_code' [code]: |
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"nat (number_of l) = (if neg (number_of l \<Colon> int) then 0 else number_of l)" |
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unfolding nat_number_of_def number_of_is_id neg_def by simp |
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lemma of_nat_int [code unfold]: |
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"of_nat = int" by (simp add: int_def) |
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declare of_nat_int [symmetric, code post] |
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code_const int |
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(SML "_") |
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(OCaml "_") |
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consts_code |
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int ("(_)") |
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nat ("\<module>nat") |
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attach {* |
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fun nat i = if i < 0 then 0 else i; |
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*} |
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code_const nat |
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(SML "IntInf.max/ (/0,/ _)") |
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(OCaml "Big'_int.max'_big'_int/ Big'_int.zero'_big'_int") |
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text {* For Haskell, things are slightly different again. *} |
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code_const int and nat |
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(Haskell "toInteger" and "fromInteger") |
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text {* Conversion from and to indices. *} |
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code_const index_of_nat |
380 |
(SML "IntInf.toInt") |
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(OCaml "Big'_int.int'_of'_big'_int") |
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(Haskell "fromEnum") |
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code_const nat_of_index |
385 |
(SML "IntInf.fromInt") |
|
386 |
(OCaml "Big'_int.big'_int'_of'_int") |
|
27673 | 387 |
(Haskell "toEnum") |
25931 | 388 |
|
389 |
text {* Using target language arithmetic operations whenever appropriate *} |
|
390 |
||
391 |
code_const "op + \<Colon> nat \<Rightarrow> nat \<Rightarrow> nat" |
|
392 |
(SML "IntInf.+ ((_), (_))") |
|
393 |
(OCaml "Big'_int.add'_big'_int") |
|
394 |
(Haskell infixl 6 "+") |
|
395 |
||
396 |
code_const "op * \<Colon> nat \<Rightarrow> nat \<Rightarrow> nat" |
|
397 |
(SML "IntInf.* ((_), (_))") |
|
398 |
(OCaml "Big'_int.mult'_big'_int") |
|
399 |
(Haskell infixl 7 "*") |
|
400 |
||
26100
fbc60cd02ae2
using only an relation predicate to construct div and mod
haftmann
parents:
26009
diff
changeset
|
401 |
code_const divmod_aux |
26009 | 402 |
(SML "IntInf.divMod/ ((_),/ (_))") |
403 |
(OCaml "Big'_int.quomod'_big'_int") |
|
404 |
(Haskell "divMod") |
|
25931 | 405 |
|
28346
b8390cd56b8f
discontinued special treatment of op = vs. eq_class.eq
haftmann
parents:
28228
diff
changeset
|
406 |
code_const "eq_class.eq \<Colon> nat \<Rightarrow> nat \<Rightarrow> bool" |
25931 | 407 |
(SML "!((_ : IntInf.int) = _)") |
408 |
(OCaml "Big'_int.eq'_big'_int") |
|
409 |
(Haskell infixl 4 "==") |
|
410 |
||
411 |
code_const "op \<le> \<Colon> nat \<Rightarrow> nat \<Rightarrow> bool" |
|
412 |
(SML "IntInf.<= ((_), (_))") |
|
413 |
(OCaml "Big'_int.le'_big'_int") |
|
414 |
(Haskell infix 4 "<=") |
|
415 |
||
416 |
code_const "op < \<Colon> nat \<Rightarrow> nat \<Rightarrow> bool" |
|
417 |
(SML "IntInf.< ((_), (_))") |
|
418 |
(OCaml "Big'_int.lt'_big'_int") |
|
419 |
(Haskell infix 4 "<") |
|
420 |
||
421 |
consts_code |
|
28522 | 422 |
"0::nat" ("0") |
423 |
"1::nat" ("1") |
|
25931 | 424 |
Suc ("(_ +/ 1)") |
425 |
"op + \<Colon> nat \<Rightarrow> nat \<Rightarrow> nat" ("(_ +/ _)") |
|
426 |
"op * \<Colon> nat \<Rightarrow> nat \<Rightarrow> nat" ("(_ */ _)") |
|
427 |
"op \<le> \<Colon> nat \<Rightarrow> nat \<Rightarrow> bool" ("(_ <=/ _)") |
|
428 |
"op < \<Colon> nat \<Rightarrow> nat \<Rightarrow> bool" ("(_ </ _)") |
|
429 |
||
430 |
||
28228 | 431 |
text {* Evaluation *} |
432 |
||
28562 | 433 |
lemma [code, code del]: |
28228 | 434 |
"(Code_Eval.term_of \<Colon> nat \<Rightarrow> term) = Code_Eval.term_of" .. |
435 |
||
436 |
code_const "Code_Eval.term_of \<Colon> nat \<Rightarrow> term" |
|
437 |
(SML "HOLogic.mk'_number/ HOLogic.natT") |
|
438 |
||
439 |
||
25931 | 440 |
text {* Module names *} |
23854 | 441 |
|
442 |
code_modulename SML |
|
443 |
Nat Integer |
|
444 |
Divides Integer |
|
28683
59c01ec6cb8d
more clever module name aliasses for code generation
haftmann
parents:
28562
diff
changeset
|
445 |
Ring_and_Field Integer |
23854 | 446 |
Efficient_Nat Integer |
447 |
||
448 |
code_modulename OCaml |
|
449 |
Nat Integer |
|
450 |
Divides Integer |
|
28683
59c01ec6cb8d
more clever module name aliasses for code generation
haftmann
parents:
28562
diff
changeset
|
451 |
Ring_and_Field Integer |
23854 | 452 |
Efficient_Nat Integer |
453 |
||
454 |
code_modulename Haskell |
|
455 |
Nat Integer |
|
24195 | 456 |
Divides Integer |
28683
59c01ec6cb8d
more clever module name aliasses for code generation
haftmann
parents:
28562
diff
changeset
|
457 |
Ring_and_Field Integer |
23854 | 458 |
Efficient_Nat Integer |
459 |
||
25931 | 460 |
hide const int |
23854 | 461 |
|
462 |
end |