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| author | Michał Muskała <[email protected]> | 2017-08-13 17:54:41 +0200 |
|---|---|---|
| committer | Michał Muskała <[email protected]> | 2017-08-14 14:24:04 +0200 |
| commit | cac51274eb9a550d5a3cc0e1b60591a9c2c1ffde (patch) | |
| tree | f636f7708eb83f9a6bac2708d9ff94830a99c123 /lib/compiler/src | |
| parent | 104c69e2153c41d5fb4eea86d18852d065258083 (diff) | |
| download | otp-cac51274eb9a550d5a3cc0e1b60591a9c2c1ffde.tar.gz otp-cac51274eb9a550d5a3cc0e1b60591a9c2c1ffde.tar.bz2 otp-cac51274eb9a550d5a3cc0e1b60591a9c2c1ffde.zip | |
Apply the redundant test optimisation also in case of fall-through
Even though, it's not possible to have fall-throughs when entering the otp
pass, it can produce them itself and we're running the pass until fixpoint.
Diffstat (limited to 'lib/compiler/src')
| -rw-r--r-- | lib/compiler/src/beam_jump.erl | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/compiler/src/beam_jump.erl b/lib/compiler/src/beam_jump.erl index c33de217bd..0bcec9ce19 100644 --- a/lib/compiler/src/beam_jump.erl +++ b/lib/compiler/src/beam_jump.erl @@ -336,6 +336,17 @@ opt([{test,_,{f,L}=Lbl,_}=I|[{label,L}|_]=Is], Acc0, St0) -> {Acc,St} = opt_useless_loads(Acc0, L, St0), opt(Is, Acc, St) end; +opt([{test,_,{f,L}=Lbl,_}=I|[{label,L}|_]=Is], Acc0, St0) -> + %% Similar to the above, except we have a fall-through rather than jump + %% Test Label Ops + %% label Label + case beam_utils:is_pure_test(I) of + false -> + opt(Is, [I|Acc0], label_used(Lbl, St0)); + true -> + {Acc,St} = opt_useless_loads(Acc0, L, St0), + opt(Is, Acc, St) + end; opt([{test,Test0,{f,L}=Lbl,Ops}=I|[{jump,To}|Is]=Is0], Acc, St) -> case is_label_defined(Is, L) of false -> |