aboutsummaryrefslogtreecommitdiffstats
path: root/lib
diff options
context:
space:
mode:
Diffstat (limited to 'lib')
-rw-r--r--lib/compiler/src/v3_kernel.erl97
-rw-r--r--lib/compiler/test/regressions_SUITE.erl19
2 files changed, 94 insertions, 22 deletions
diff --git a/lib/compiler/src/v3_kernel.erl b/lib/compiler/src/v3_kernel.erl
index 2bfa610628..4b5d7d919c 100644
--- a/lib/compiler/src/v3_kernel.erl
+++ b/lib/compiler/src/v3_kernel.erl
@@ -151,6 +151,7 @@ include_attribute(optional_callbacks) -> false;
include_attribute(_) -> true.
function({#c_var{name={F,Arity}=FA},Body}, St0) ->
+ %%io:format("~w/~w~n", [F,Arity]),
try
St1 = St0#kern{func=FA,ff=undefined,vcount=0,fcount=0,ds=cerl_sets:new()},
{#ifun{anno=Ab,vars=Kvs,body=B0},[],St2} = expr(Body, new_sub(), St1),
@@ -1820,10 +1821,70 @@ select(T, Cs) -> [ C || C <- Cs, clause_con(C) =:= T ].
%% At this point all the clauses have the same constructor, we must
%% now separate them according to value.
-match_value(Us, T, Cs0, Def, St0) ->
- Css = group_value(T, Cs0),
+match_value(Us0, T, Cs0, Def, St0) ->
+ {Us1,Cs1,St1} = partition_intersection(T, Us0, Cs0, St0),
+ UCss = group_value(T, Us1, Cs1),
%%ok = io:format("match_value ~p ~p~n", [T, Css]),
- mapfoldl(fun (Cs, St) -> match_clause(Us, Cs, Def, St) end, St0, Css).
+ mapfoldl(fun ({Us,Cs}, St) -> match_clause(Us, Cs, Def, St) end, St1, UCss).
+
+%% partition_intersection
+%% Partitions a map into two maps with the most common keys to the first map.
+%% case <M> of
+%% <#{a}>
+%% <#{a,b}>
+%% <#{a,c}>
+%% <#{c}>
+%% end
+%% becomes
+%% case <M,M> of
+%% <#{a}, #{ }>
+%% <#{a}, #{b}>
+%% <#{ }, #{c}>
+%% <#{a}, #{c}>
+%% end
+%% The intention is to group as many keys together as possible and thus
+%% reduce the number of lookups to that key.
+partition_intersection(k_map, [U|_]=Us0, [_,_|_]=Cs0,St0) ->
+ Ps = [clause_val(C) || C <- Cs0],
+ case find_key_partition(Ps) of
+ no_partition ->
+ {Us0,Cs0,St0};
+ Ks ->
+ {Cs1,St1} = mapfoldl(fun(#iclause{pats=[Arg|Args]}=C, Sti) ->
+ {{Arg1,Arg2},St} = partition_key_intersection(Arg, Ks, Sti),
+ {C#iclause{pats=[Arg1,Arg2|Args]}, St}
+ end, St0, Cs0),
+ {[U|Us0],Cs1,St1}
+ end;
+partition_intersection(_, Us, Cs, St) ->
+ {Us,Cs,St}.
+
+partition_key_intersection(#k_map{es=Pairs}=Map,Ks,St0) ->
+ F = fun(#k_map_pair{key=Key}) -> member(map_key_clean(Key), Ks) end,
+ {Ps1,Ps2} = partition(F, Pairs),
+ {{Map#k_map{es=Ps1},Map#k_map{es=Ps2}},St0};
+partition_key_intersection(#ialias{pat=Map}=Alias,Ks,St0) ->
+ %% only alias one of them
+ {{Map1,Map2},St1} = partition_key_intersection(Map, Ks, St0),
+ {{Map1,Alias#ialias{pat=Map2}},St1}.
+
+% Only check for the complete intersection of keys and not commonality
+find_key_partition(Ps) ->
+ Sets = [sets:from_list(Ks)||Ks <- Ps],
+ Is = sets:intersection(Sets),
+ case sets:to_list(Is) of
+ [] -> no_partition;
+ KeyIntersection ->
+ %% Check if the intersection are all keys in all clauses.
+ %% Don't split if they are since this will only
+ %% infer extra is_map instructions with no gain.
+ All = foldl(fun (Kset, Bool) ->
+ Bool andalso sets:is_subset(Kset, Is)
+ end, true, Sets),
+ if All -> no_partition;
+ true -> KeyIntersection
+ end
+ end.
%% group_value([Clause]) -> [[Clause]].
%% Group clauses according to value. Here we know that
@@ -1831,30 +1892,30 @@ match_value(Us, T, Cs0, Def, St0) ->
%% 2. The clauses in bin_segs cannot be reordered only grouped
%% 3. Other types are disjoint and can be reordered
-group_value(k_cons, Cs) -> [Cs]; %These are single valued
-group_value(k_nil, Cs) -> [Cs];
-group_value(k_binary, Cs) -> [Cs];
-group_value(k_bin_end, Cs) -> [Cs];
-group_value(k_bin_seg, Cs) -> group_bin_seg(Cs);
-group_value(k_bin_int, Cs) -> [Cs];
-group_value(k_map, Cs) -> group_map(Cs);
-group_value(_, Cs) ->
+group_value(k_cons, Us, Cs) -> [{Us,Cs}]; %These are single valued
+group_value(k_nil, Us, Cs) -> [{Us,Cs}];
+group_value(k_binary, Us, Cs) -> [{Us,Cs}];
+group_value(k_bin_end, Us, Cs) -> [{Us,Cs}];
+group_value(k_bin_seg, Us, Cs) -> group_bin_seg(Us,Cs);
+group_value(k_bin_int, Us, Cs) -> [{Us,Cs}];
+group_value(k_map, Us, Cs) -> group_map(Us,Cs);
+group_value(_, Us, Cs) ->
%% group_value(Cs).
Cd = foldl(fun (C, Gcs0) -> dict:append(clause_val(C), C, Gcs0) end,
dict:new(), Cs),
- dict:fold(fun (_, Vcs, Css) -> [Vcs|Css] end, [], Cd).
+ dict:fold(fun (_, Vcs, Css) -> [{Us,Vcs}|Css] end, [], Cd).
-group_bin_seg([C1|Cs]) ->
+group_bin_seg(Us, [C1|Cs]) ->
V1 = clause_val(C1),
{More,Rest} = splitwith(fun (C) -> clause_val(C) == V1 end, Cs),
- [[C1|More]|group_bin_seg(Rest)];
-group_bin_seg([]) -> [].
+ [{Us,[C1|More]}|group_bin_seg(Us,Rest)];
+group_bin_seg(_, []) -> [].
-group_map([C1|Cs]) ->
+group_map(Us, [C1|Cs]) ->
V1 = clause_val(C1),
{More,Rest} = splitwith(fun (C) -> clause_val(C) =:= V1 end, Cs),
- [[C1|More]|group_map(Rest)];
-group_map([]) -> [].
+ [{Us,[C1|More]}|group_map(Us,Rest)];
+group_map(_, []) -> [].
%% Profiling shows that this quadratic implementation account for a big amount
%% of the execution time if there are many values.
diff --git a/lib/compiler/test/regressions_SUITE.erl b/lib/compiler/test/regressions_SUITE.erl
index 7d2c2ac974..7a6fe08c73 100644
--- a/lib/compiler/test/regressions_SUITE.erl
+++ b/lib/compiler/test/regressions_SUITE.erl
@@ -24,7 +24,7 @@
-export([all/0,groups/0,init_per_testcase/2,end_per_testcase/2,suite/0]).
-export([maps/1]).
-groups() ->
+groups() ->
[{p,test_lib:parallel(),
[maps]}].
@@ -38,7 +38,7 @@ suite() ->
[{ct_hooks,[ts_install_cth]},
{timetrap,{minutes,2}}].
-all() ->
+all() ->
test_lib:recompile(?MODULE),
[{group,p}].
@@ -48,7 +48,18 @@ maps(Config) when is_list(Config) ->
Ts = [{beam_bool_get_elements,
<<"century(#{ron := operator}, _century) ->
if 0.0; _century, _century, _century -> _century end.
- ">>}],
+ ">>},
+ {empty_map_clauses,
+ <<"politics(#{}, researchers) -> concerned;
+ politics(#{[] := _}, workers) -> dot;
+ politics(#{[] := ct}, counsel) -> calls.
+ ">>},
+ {empty_map_clauses_variable,
+ <<"georgia(#{a := effectively}, ratio, is, eventually) -> teens;
+ georgia(#{a := government}, knowledge, poker, partly) -> signed;
+ georgia(#{}, recording, bring, vital) -> divided;
+ georgia(#{0 := 0}, articles, brought, #{true := true, a := There}) -> There.
+ ">>}],
ok = run(Config, Ts),
ok.
@@ -58,7 +69,7 @@ run(Config, Tests) ->
F = fun({N,P}) ->
io:format("Compiling test for: ~w~n", [N]),
case catch run_test(Config, P) of
- {'EXIT', Reason} ->
+ {'EXIT', Reason} ->
io:format("~nTest ~p failed.~nReason: ~p~n",
[N, Reason]),
fail();
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 03:02:52 +0000