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-rw-r--r--lib/compiler/src/beam_dead.erl20
1 files changed, 14 insertions, 6 deletions
diff --git a/lib/compiler/src/beam_dead.erl b/lib/compiler/src/beam_dead.erl
index d379fdc4eb..1b152a2d6f 100644
--- a/lib/compiler/src/beam_dead.erl
+++ b/lib/compiler/src/beam_dead.erl
@@ -272,7 +272,8 @@ backward([{jump,{f,To0}},{move,Src,Reg}=Move|Is], D, Acc) ->
end;
backward([{jump,{f,To}}=J|[{bif,Op,{f,BifFail},Ops,Reg}|Is]=Is0], D, Acc) ->
try replace_comp_op(To, Reg, Op, Ops, D) of
- I -> backward(Is, D, I++Acc)
+ {Test,Jump} ->
+ backward([Jump,Test|Is], D, Acc)
catch
throw:not_possible ->
case To =:= BifFail of
@@ -446,7 +447,7 @@ prune_redundant([], _) -> [].
replace_comp_op(To, Reg, Op, Ops, D) ->
False = comp_op_find_shortcut(To, Reg, {atom,false}, D),
True = comp_op_find_shortcut(To, Reg, {atom,true}, D),
- [bif_to_test(Op, Ops, False),{jump,{f,True}}].
+ {bif_to_test(Op, Ops, False),{jump,{f,True}}}.
comp_op_find_shortcut(To0, Reg, Val, D) ->
case shortcut_select_label(To0, Reg, Val, D) of
@@ -483,15 +484,22 @@ not_possible() -> throw(not_possible).
%% F1: is_eq_exact F2 Reg Lit2 F1: is_eq_exact F2 Reg Lit2
%% L2: .... L2:
%%
-combine_eqs(To, [Reg,{Type,_}=Lit1]=Ops, D, [{label,L1}|_])
- when Type =:= atom; Type =:= integer ->
+combine_eqs(To, [Reg,{Type,_}=Lit1]=Ops, D, Acc)
+ when Type =:= atom; Type =:= integer ->
+ Next = case Acc of
+ [{label,Lbl}|_] -> Lbl;
+ [{jump,{f,Lbl}}|_] -> Lbl
+ end,
case beam_utils:code_at(To, D) of
[{test,is_eq_exact,{f,F2},[Reg,{Type,_}=Lit2]},
{label,L2}|_] when Lit1 =/= Lit2 ->
- {select,select_val,Reg,{f,F2},[Lit1,{f,L1},Lit2,{f,L2}]};
+ {select,select_val,Reg,{f,F2},[Lit1,{f,Next},Lit2,{f,L2}]};
+ [{test,is_eq_exact,{f,F2},[Reg,{Type,_}=Lit2]},
+ {jump,{f,L2}}|_] when Lit1 =/= Lit2 ->
+ {select,select_val,Reg,{f,F2},[Lit1,{f,Next},Lit2,{f,L2}]};
[{select,select_val,Reg,{f,F2},[{Type,_}|_]=List0}|_] ->
List = remove_from_list(Lit1, List0),
- {select,select_val,Reg,{f,F2},[Lit1,{f,L1}|List]};
+ {select,select_val,Reg,{f,F2},[Lit1,{f,Next}|List]};
_Is ->
{test,is_eq_exact,{f,To},Ops}
end;