diff options
| author | letouzey | 2011-04-07 11:04:46 +0000 |
|---|---|---|
| committer | letouzey | 2011-04-07 11:04:46 +0000 |
| commit | 92a5f74259977cc3f92d8b822bdb727a95e64bc6 (patch) | |
| tree | fbe2bd20200ac9de7c89c6a8752f3f007ed06b30 /plugins | |
| parent | 5de2bbd213eb770ba465c67103004d9286444a63 (diff) | |
Extraction: unfolds the let-in created by Program when handling "match"
This leads to code closer to the original input of the user,
and moreover some more dummy __ may be removed this way.
To avoid unfolding by mistake user's variables, we change
the name of these generated let-in into "program_branch_NN" instead
of "branch_NN"
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13964 85f007b7-540e-0410-9357-904b9bb8a0f7
Diffstat (limited to 'plugins')
| -rw-r--r-- | plugins/extraction/mlutil.ml | 19 | ||||
| -rw-r--r-- | plugins/subtac/subtac_cases.ml | 2 |
2 files changed, 19 insertions, 2 deletions
diff --git a/plugins/extraction/mlutil.ml b/plugins/extraction/mlutil.ml index 03b62f8364..d8b7d364f1 100644 --- a/plugins/extraction/mlutil.ml +++ b/plugins/extraction/mlutil.ml @@ -799,6 +799,23 @@ let is_atomic = function let is_imm_apply = function MLapp (MLrel 1, _) -> true | _ -> false +(** Program creates a let-in named "program_branch_NN" for each branch of match. + Unfolding them leads to more natural code (and more dummy removal) *) + +let is_program_branch = function + | Id id -> + let s = string_of_id id in + let br = "program_branch_" in + let n = String.length br in + (try + ignore (int_of_string (String.sub s n (String.length s - n))); + String.sub s 0 n = br + with _ -> false) + | Tmp _ | Dummy -> false + +let expand_linear_let o id e = + o.opt_lin_let || is_tmp id || is_program_branch id || is_imm_apply e + (*S The main simplification function. *) (* Some beta-iota reductions + simplifications. *) @@ -815,7 +832,7 @@ let rec simpl o = function if (is_atomic c) || (is_atomic e) || (let n = nb_occur_match e in - (n = 0 || (n=1 && (is_tmp id || is_imm_apply e || o.opt_lin_let)))) + (n = 0 || (n=1 && expand_linear_let o id e))) then simpl o (ast_subst c e) else diff --git a/plugins/subtac/subtac_cases.ml b/plugins/subtac/subtac_cases.ml index 4f8344745e..cd4400f186 100644 --- a/plugins/subtac/subtac_cases.ml +++ b/plugins/subtac/subtac_cases.ml @@ -1738,7 +1738,7 @@ let constrs_of_pats typing_fun env isevars eqns tomatchs sign neqs arity = let j = typing_fun (mk_tycon tycon) rhs_env eqn.rhs.it in let bbody = it_mkLambda_or_LetIn j.uj_val rhs_rels' and btype = it_mkProd_or_LetIn j.uj_type rhs_rels' in - let branch_name = id_of_string ("branch_" ^ (string_of_int !i)) in + let branch_name = id_of_string ("program_branch_" ^ (string_of_int !i)) in let branch_decl = (Name branch_name, Some (lift !i bbody), (lift !i btype)) in let branch = let bref = GVar (dummy_loc, branch_name) in |