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authorBjörn Gustavsson <[email protected]>2016-10-26 12:58:38 +0200
committerBjörn Gustavsson <[email protected]>2016-10-28 10:16:10 +0200
commit456ba65161d9228a2562d32bd25b0a15c90011b8 (patch)
tree6bd9dfe139d94380bbeb2e6ad8034b3e3d7bd641 /lib/compiler/src
parente9c343d551779c975f075ae812ef8cd7ae0a1d64 (diff)
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sys_core_fold: Use less effort optimizing not in lets
There are two calls opt_not_in_let(). Since 05130e4855 introduced iteration to a fixpoint, only the first call is needed. Removing the redundant call will slightly speed up compilation.
Diffstat (limited to 'lib/compiler/src')
-rw-r--r--lib/compiler/src/sys_core_fold.erl23
1 files changed, 7 insertions, 16 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 7c233b323b..5d7fd37270 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -2151,7 +2151,7 @@ letify(Bs, Body) ->
-spec opt_not_in_let(cerl:c_let()) -> cerl:cerl().
opt_not_in_let(#c_let{vars=[_]=Vs0,arg=Arg0,body=Body0}=Let) ->
- case opt_not_in_let(Vs0, Arg0, Body0) of
+ case opt_not_in_let_0(Vs0, Arg0, Body0) of
{[],#c_values{es=[]},Body} ->
Body;
{Vs,Arg,Body} ->
@@ -2159,13 +2159,7 @@ opt_not_in_let(#c_let{vars=[_]=Vs0,arg=Arg0,body=Body0}=Let) ->
end;
opt_not_in_let(Let) -> Let.
-%% opt_not_in_let(Vs, Arg, Body) -> {Vs',Arg',Body'}
-%% Try to optimize away a 'not' operator in a 'let'.
-
--spec opt_not_in_let([cerl:c_var()], cerl:cerl(), cerl:cerl()) ->
- {[cerl:c_var()],cerl:cerl(),cerl:cerl()}.
-
-opt_not_in_let([#c_var{name=V}]=Vs0, Arg0, Body0) ->
+opt_not_in_let_0([#c_var{name=V}]=Vs0, Arg0, Body0) ->
case cerl:type(Body0) of
call ->
%% let <V> = Expr in not V ==>
@@ -2196,9 +2190,7 @@ opt_not_in_let([#c_var{name=V}]=Vs0, Arg0, Body0) ->
end;
_ ->
{Vs0,Arg0,Body0}
- end;
-opt_not_in_let(Vs, Arg, Body) ->
- {Vs,Arg,Body}.
+ end.
opt_not_in_let_1(V, Call, Body) ->
case Call of
@@ -2652,11 +2644,10 @@ opt_simple_let_0(#c_let{arg=Arg0}=Let, Ctxt, Sub) ->
opt_simple_let_1(#c_let{vars=Vs0,body=B0}=Let, Arg0, Ctxt, Sub0) ->
%% Optimise let and add new substitutions.
- {Vs1,Args,Sub1} = let_substs(Vs0, Arg0, Sub0),
- BodySub = update_let_types(Vs1, Args, Sub1),
- B1 = body(B0, Ctxt, BodySub),
- Arg1 = core_lib:make_values(Args),
- {Vs,Arg,B} = opt_not_in_let(Vs1, Arg1, B1),
+ {Vs,Args,Sub1} = let_substs(Vs0, Arg0, Sub0),
+ BodySub = update_let_types(Vs, Args, Sub1),
+ B = body(B0, Ctxt, BodySub),
+ Arg = core_lib:make_values(Args),
opt_simple_let_2(Let, Vs, Arg, B, B0, Ctxt, Sub1).
opt_simple_let_2(Let0, Vs0, Arg0, Body, PrevBody, Ctxt, Sub) ->