aboutsummaryrefslogtreecommitdiffstats
path: root/lib/compiler
diff options
context:
space:
mode:
Diffstat (limited to 'lib/compiler')
-rw-r--r--lib/compiler/src/sys_core_fold.erl15
-rw-r--r--lib/compiler/src/v3_kernel.erl27
2 files changed, 28 insertions, 14 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index cbf6e256f7..7acf08129a 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -1458,8 +1458,19 @@ sub_add_scope(Vs, #sub{s=Scope0}=Sub) ->
Sub#sub{s=Scope}.
sub_subst_scope(#sub{v=S0,s=Scope}=Sub) ->
- S = [{-1,#c_var{name=Sv}} || Sv <- cerl_sets:to_list(Scope)]++S0,
- Sub#sub{v=S}.
+ Initial = case S0 of
+ [{NegInt,_}|_] when is_integer(NegInt), NegInt < 0 ->
+ NegInt - 1;
+ _ ->
+ -1
+ end,
+ S = sub_subst_scope_1(cerl_sets:to_list(Scope), Initial, S0),
+ Sub#sub{v=orddict:from_list(S)}.
+
+%% The keys in an orddict must be unique. Make them so!
+sub_subst_scope_1([H|T], Key, Acc) ->
+ sub_subst_scope_1(T, Key-1, [{Key,#c_var{name=H}}|Acc]);
+sub_subst_scope_1([], _, Acc) -> Acc.
sub_is_val(#c_var{name=V}, #sub{v=S,s=Scope}) ->
%% When the bottleneck in sub_del_var/2 was eliminated, this
diff --git a/lib/compiler/src/v3_kernel.erl b/lib/compiler/src/v3_kernel.erl
index 004c609311..1fc05109c5 100644
--- a/lib/compiler/src/v3_kernel.erl
+++ b/lib/compiler/src/v3_kernel.erl
@@ -1313,23 +1313,26 @@ get_vsub(V, Vsub) ->
set_vsub(V, S, Vsub) ->
orddict:store(V, S, Vsub).
-subst_vsub(Key, New, [{K,Key}|Dict]) ->
+subst_vsub(Key, New, Vsub) ->
+ orddict:from_list(subst_vsub_1(Key, New, Vsub)).
+
+subst_vsub_1(Key, New, [{K,Key}|Dict]) ->
%% Fold chained substitution.
- [{K,New}|subst_vsub(Key, New, Dict)];
-subst_vsub(Key, New, [{K,_}|_]=Dict) when Key < K ->
+ [{K,New}|subst_vsub_1(Key, New, Dict)];
+subst_vsub_1(Key, New, [{K,_}|_]=Dict) when Key < K ->
%% Insert the new substitution here, and continue
%% look for chained substitutions.
- [{Key,New}|subst_vsub_1(Key, New, Dict)];
-subst_vsub(Key, New, [{K,_}=E|Dict]) when Key > K ->
- [E|subst_vsub(Key, New, Dict)];
-subst_vsub(Key, New, []) -> [{Key,New}].
+ [{Key,New}|subst_vsub_2(Key, New, Dict)];
+subst_vsub_1(Key, New, [{K,_}=E|Dict]) when Key > K ->
+ [E|subst_vsub_1(Key, New, Dict)];
+subst_vsub_1(Key, New, []) -> [{Key,New}].
-subst_vsub_1(V, S, [{K,V}|Dict]) ->
+subst_vsub_2(V, S, [{K,V}|Dict]) ->
%% Fold chained substitution.
- [{K,S}|subst_vsub_1(V, S, Dict)];
-subst_vsub_1(V, S, [E|Dict]) ->
- [E|subst_vsub_1(V, S, Dict)];
-subst_vsub_1(_, _, []) -> [].
+ [{K,S}|subst_vsub_2(V, S, Dict)];
+subst_vsub_2(V, S, [E|Dict]) ->
+ [E|subst_vsub_2(V, S, Dict)];
+subst_vsub_2(_, _, []) -> [].
get_fsub(F, A, Fsub) ->
case orddict:find({F,A}, Fsub) of