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authorMagnus Lång <[email protected]>2016-11-14 15:31:28 +0100
committerMagnus Lång <[email protected]>2016-11-16 17:22:05 +0100
commit6ce54e9665788e6a172950c68fb58158e923c6ec (patch)
treee32019645cf6faa338115538ade7044340b60b9f /lib/hipe/icode
parent40b7dc3ce63999a6e8d40c20a098de6d85676aeb (diff)
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hipe_icode: Always const-propagate if&call args
Diffstat (limited to 'lib/hipe/icode')
-rw-r--r--lib/hipe/icode/hipe_icode.erl4
-rw-r--r--lib/hipe/icode/hipe_icode_ssa_const_prop.erl43
2 files changed, 29 insertions, 18 deletions
diff --git a/lib/hipe/icode/hipe_icode.erl b/lib/hipe/icode/hipe_icode.erl
index dce2fcb392..d2d08e0253 100644
--- a/lib/hipe/icode/hipe_icode.erl
+++ b/lib/hipe/icode/hipe_icode.erl
@@ -438,6 +438,7 @@
if_true_label/1,
if_false_label/1,
if_args/1,
+ if_args_update/2,
if_pred/1,
%% is_if/1,
@@ -714,6 +715,9 @@ if_op_update(IF, NewOp) -> IF#icode_if{op=NewOp}.
-spec if_args(#icode_if{}) -> [icode_term_arg()].
if_args(#icode_if{args=Args}) -> Args.
+-spec if_args_update(#icode_if{}, [icode_term_arg()]) -> #icode_if{}.
+if_args_update(IF, Args) -> IF#icode_if{args=Args}.
+
-spec if_true_label(#icode_if{}) -> icode_lbl().
if_true_label(#icode_if{true_label=TrueLbl}) -> TrueLbl.
diff --git a/lib/hipe/icode/hipe_icode_ssa_const_prop.erl b/lib/hipe/icode/hipe_icode_ssa_const_prop.erl
index 4ab4d7e95d..5d3d5413bc 100644
--- a/lib/hipe/icode/hipe_icode_ssa_const_prop.erl
+++ b/lib/hipe/icode/hipe_icode_ssa_const_prop.erl
@@ -97,11 +97,13 @@ visit_expression(Instruction, Environment) ->
visit_begin_handler (Instruction, EvaluatedArguments, Environment);
#icode_begin_try{} ->
visit_begin_try (Instruction, EvaluatedArguments, Environment);
- #icode_fail{} ->
+ #icode_fail{} ->
visit_fail (Instruction, EvaluatedArguments, Environment);
- _ ->
- %% label, end_try, comment, return,
- {[], [], Environment}
+ #icode_comment{} -> {[], [], Environment};
+ #icode_end_try{} -> {[], [], Environment};
+ #icode_enter{} -> {[], [], Environment};
+ #icode_label{} -> {[], [], Environment};
+ #icode_return{} -> {[], [], Environment}
end.
%%-----------------------------------------------------------------------------
@@ -463,11 +465,15 @@ update_instruction(Instruction, Environment) ->
update_type(Instruction, Environment);
#icode_switch_tuple_arity{} ->
update_switch_tuple_arity(Instruction, Environment);
- _ ->
- %% goto, comment, label, return, begin_handler, end_try,
- %% begin_try, fail
- %% We could but don't handle: catch?, fail?
- [Instruction]
+ %% We could but don't handle: catch?, fail?
+ #icode_begin_handler{} -> [Instruction];
+ #icode_begin_try{} -> [Instruction];
+ #icode_comment{} -> [Instruction];
+ #icode_end_try{} -> [Instruction];
+ #icode_fail{} -> [Instruction];
+ #icode_goto{} -> [Instruction];
+ #icode_label{} -> [Instruction];
+ #icode_return{} -> [Instruction]
end.
%%-----------------------------------------------------------------------------
@@ -502,14 +508,12 @@ update_call(Instruction, Environment) ->
[Instruction, NewInstructions]),
NewInstructions
end;
-%% %% [] -> %% No destination; we don't touch this
-%% [] ->
-%% NewArguments = update_arguments(hipe_icode:call_args(Instruction),
-%% Environment),
-%% [hipe_icode:call_args_update(Instruction, NewArguments)];
+ %% [] -> %% No destination; we don't touch this
%% List-> %% Means register allocation; not implemented at this point
_ ->
- [Instruction]
+ NewArguments = update_arguments(hipe_icode:call_args(Instruction),
+ Environment),
+ [hipe_icode:call_args_update(Instruction, NewArguments)]
end.
%%-----------------------------------------------------------------------------
@@ -574,7 +578,9 @@ update_if(Instruction, Environment) ->
%% Convert the if-test to a type test if possible.
Op = hipe_icode:if_op(Instruction),
case Op =:= '=:=' orelse Op =:= '=/=' of
- false -> [Instruction];
+ false ->
+ [hipe_icode:if_args_update(
+ Instruction, update_arguments(Args, Environment))];
true ->
[Arg1, Arg2] = Args,
case EvaluatedArguments of
@@ -604,8 +610,9 @@ conv_if_to_type(I, Const, Arg) when is_atom(Const);
NewI = hipe_icode:mk_type([Arg], Test, T, F),
?CONST_PROP_MSG("if: ~w ---> type ~w\n", [I, NewI]),
[NewI];
-conv_if_to_type(I, _, _) ->
- [I].
+conv_if_to_type(I, Const, Arg) ->
+ %% Note: we are potentially commuting the (equality) comparison here
+ [hipe_icode:if_args_update(I, [Arg, hipe_icode:mk_const(Const)])].
%%-----------------------------------------------------------------------------