1 (* =========================================================== *)
2 (* Cached natural arithmetic *)
3 (* Author: Alexey Solovyev *)
5 (* =========================================================== *)
8 needs "arith_options.hl";;
9 needs "arith/arith_num.hl";;
12 module Arith_cache = struct
14 let cache_size = if !Arith_options.cached then !Arith_options.init_cache_size else 1;;
18 if Hashtbl.length h >= !Arith_options.max_cache_size then
20 (* let _ = Hashtbl.clear h in
21 print_string "Clearing a nat hash table" *)
25 let le_table = Hashtbl.create cache_size and
26 add_table = Hashtbl.create cache_size and
27 sub_table = Hashtbl.create cache_size and
28 sub_le_table = Hashtbl.create cache_size and
29 mul_table = Hashtbl.create cache_size and
30 div_table = Hashtbl.create cache_size;;
32 (* Counters for collecting stats *)
33 let suc_counter = ref 0 and
34 eq0_counter = ref 0 and
35 pre_counter = ref 0 and
36 gt0_counter = ref 0 and
37 lt_counter = ref 0 and
38 le_counter = ref 0 and
39 add_counter = ref 0 and
40 sub_counter = ref 0 and
41 sub_le_counter = ref 0 and
42 mul_counter = ref 0 and
43 div_counter = ref 0 and
44 even_counter = ref 0 and
48 (* Clears all cached results *)
50 let clear = Hashtbl.clear in
59 (* Resets all counters *)
77 let len = Hashtbl.length in
78 let suc_pre_str = sprintf "suc = %d\npre = %d\n" !suc_counter !pre_counter in
79 let cmp0_str = sprintf "eq0 = %d\ngt0 = %d\n" !eq0_counter !gt0_counter in
80 let lt_str = sprintf "lt = %d\n" !lt_counter in
81 let even_odd_str = sprintf "even = %d\nodd = %d\n" !even_counter !odd_counter in
82 let le_str = sprintf "le = %d (le_hash = %d)\n" !le_counter (len le_table) in
83 let add_str = sprintf "add = %d (add_hash = %d)\n" !add_counter (len add_table) in
84 let sub_str = sprintf "sub = %d (sub_hash = %d)\n" !sub_counter (len sub_table) in
85 let sub_le_str = sprintf "sub_le = %d (sub_le_hash = %d)\n" !sub_le_counter (len sub_le_table) in
86 let mul_str = sprintf "mul = %d (mul_hash = %d)\n" !mul_counter (len mul_table) in
87 let div_str = sprintf "div = %d (div_hash = %d)\n" !div_counter (len div_table) in
88 print_string (suc_pre_str ^ cmp0_str ^ lt_str ^ even_odd_str ^
89 le_str ^ add_str ^ sub_str ^ sub_le_str ^ mul_str ^ div_str);;
92 (* Note: the standard Hashtbl.hash function works very purely on terms *)
93 let rec num_tm_hash tm =
95 let b_tm, n_tm = dest_comb tm in
96 let str = (fst o dest_const) b_tm in
97 str ^ num_tm_hash n_tm
102 let lhs, tm2 = dest_comb tm in
103 let tm1 = rand lhs in
104 num_tm_hash tm1 ^ "x" ^ num_tm_hash tm2;;
107 let tm1_tm2_hash tm1 tm2 =
108 num_tm_hash tm1 ^ "x" ^ num_tm_hash tm2;;
112 let raw_suc_conv_hash tm =
113 let _ = suc_counter := !suc_counter + 1 in
114 (* let _ = suc_list := tm :: !suc_list in *)
115 Arith_hash.raw_suc_conv_hash tm;;
118 let raw_eq0_hash_conv tm =
119 let _ = eq0_counter := !eq0_counter + 1 in
120 (* let _ = eq0_list := tm :: !eq0_list in *)
121 Arith_hash.raw_eq0_hash_conv tm;;
124 let raw_pre_hash_conv tm =
125 let _ = pre_counter := !pre_counter + 1 in
126 Arith_hash.raw_pre_hash_conv tm;;
129 let raw_gt0_hash_conv tm =
130 let _ = gt0_counter := !gt0_counter + 1 in
131 Arith_hash.raw_gt0_hash_conv tm;;
134 let raw_lt_hash_conv tm =
135 let _ = lt_counter := !lt_counter + 1 in
136 Arith_hash.raw_lt_hash_conv tm;;
139 let raw_le_hash_conv tm =
140 let _ = le_counter := !le_counter + 1 in
141 let hash = op_tm_hash tm in
143 Hashtbl.find le_table hash
145 let result = Arith_hash.raw_le_hash_conv tm in
146 let _ = my_add le_table hash result in
150 let raw_add_conv_hash tm =
151 let _ = add_counter := !add_counter + 1 in
152 let hash = op_tm_hash tm in
154 Hashtbl.find add_table hash
156 let result = Arith_hash.raw_add_conv_hash tm in
157 let _ = my_add add_table hash result in
161 let raw_sub_hash_conv tm =
162 let _ = sub_counter := !sub_counter + 1 in
163 let hash = op_tm_hash tm in
165 Hashtbl.find sub_table hash
167 let result = Arith_hash.raw_sub_hash_conv tm in
168 let _ = my_add sub_table hash result in
171 let raw_sub_and_le_hash_conv tm1 tm2 =
172 let _ = sub_le_counter := !sub_le_counter + 1 in
173 let hash = tm1_tm2_hash tm1 tm2 in
175 Hashtbl.find sub_le_table hash
177 let result = Arith_hash.raw_sub_and_le_hash_conv tm1 tm2 in
178 let _ = my_add sub_le_table hash result in
182 let raw_mul_conv_hash tm =
183 let _ = mul_counter := !mul_counter + 1 in
184 let hash = op_tm_hash tm in
186 Hashtbl.find mul_table hash
188 let result = Arith_hash.raw_mul_conv_hash tm in
189 let _ = my_add mul_table hash result in
193 let raw_div_hash_conv tm =
194 let _ = div_counter := !div_counter + 1 in
195 let hash = op_tm_hash tm in
197 Hashtbl.find div_table hash
199 let result = Arith_hash.raw_div_hash_conv tm in
200 let _ = my_add div_table hash result in
204 let raw_even_hash_conv tm =
205 let _ = even_counter := !even_counter + 1 in
206 Arith_hash.raw_even_hash_conv tm;;
208 let raw_odd_hash_conv tm =
209 let _ = odd_counter := !odd_counter + 1 in
210 Arith_hash.raw_odd_hash_conv tm;;