diff options
| -rw-r--r-- | lib/compiler/src/beam_clean.erl | 20 | ||||
| -rw-r--r-- | lib/compiler/src/beam_peep.erl | 16 |
2 files changed, 20 insertions, 16 deletions
diff --git a/lib/compiler/src/beam_clean.erl b/lib/compiler/src/beam_clean.erl index 7d66985791..d9108c383d 100644 --- a/lib/compiler/src/beam_clean.erl +++ b/lib/compiler/src/beam_clean.erl @@ -190,17 +190,11 @@ replace([{test,Test,{f,Lbl},Ops}|Is], Acc, D) -> replace([{test,Test,{f,Lbl},Live,Ops,Dst}|Is], Acc, D) -> replace(Is, [{test,Test,{f,label(Lbl, D)},Live,Ops,Dst}|Acc], D); replace([{select,I,R,{f,Fail0},Vls0}|Is], Acc, D) -> - Vls1 = map(fun ({f,L}) -> {f,label(L, D)}; - (Other) -> Other end, Vls0), + Vls = map(fun ({f,L}) -> {f,label(L, D)}; + (Other) -> Other + end, Vls0), Fail = label(Fail0, D), - case redundant_values(Vls1, Fail, []) of - [] -> - %% Oops, no choices left. The loader will not accept that. - %% Convert to a plain jump. - replace(Is, [{jump,{f,Fail}}|Acc], D); - Vls -> - replace(Is, [{select,I,R,{f,Fail},Vls}|Acc], D) - end; + replace(Is, [{select,I,R,{f,Fail},Vls}|Acc], D); replace([{'try',R,{f,Lbl}}|Is], Acc, D) -> replace(Is, [{'try',R,{f,label(Lbl, D)}}|Acc], D); replace([{'catch',R,{f,Lbl}}|Is], Acc, D) -> @@ -241,12 +235,6 @@ label(Old, D) -> {value,Val} -> Val; none -> throw({error,{undefined_label,Old}}) end. - -redundant_values([_,{f,Fail}|Vls], Fail, Acc) -> - redundant_values(Vls, Fail, Acc); -redundant_values([Val,Lbl|Vls], Fail, Acc) -> - redundant_values(Vls, Fail, [Lbl,Val|Acc]); -redundant_values([], _, Acc) -> reverse(Acc). %%% %%% Final fixup of bs_start_match2/5,bs_save2/bs_restore2 instructions for diff --git a/lib/compiler/src/beam_peep.erl b/lib/compiler/src/beam_peep.erl index 75be86b83f..0c1abfe6a0 100644 --- a/lib/compiler/src/beam_peep.erl +++ b/lib/compiler/src/beam_peep.erl @@ -83,6 +83,16 @@ peep([{gc_bif,_,_,_,_,Dst}=I|Is], SeenTests0, Acc) -> %% Kill all remembered tests that depend on the destination register. SeenTests = kill_seen(Dst, SeenTests0), peep(Is, SeenTests, [I|Acc]); +peep([{select,Op,R,F,Vls0}|Is], _, Acc) -> + case prune_redundant_values(Vls0, F) of + [] -> + %% No values left. Must convert to plain jump. + I = {jump,F}, + peep(Is, gb_sets:empty(), [I|Acc]); + [_|_]=Vls -> + I = {select,Op,R,F,Vls}, + peep(Is, gb_sets:empty(), [I|Acc]) + end; peep([{test,Op,_,Ops}=I|Is], SeenTests0, Acc) -> case beam_utils:is_pure_test(I) of false -> @@ -127,3 +137,9 @@ kill_seen_1([{_,Ops}=Test|T], Dst) -> false -> [Test|kill_seen_1(T, Dst)] end; kill_seen_1([], _) -> []. + +prune_redundant_values([_Val,F|Vls], F) -> + prune_redundant_values(Vls, F); +prune_redundant_values([Val,Lbl|Vls], F) -> + [Val,Lbl|prune_redundant_values(Vls, F)]; +prune_redundant_values([], _) -> []. |