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-rw-r--r--lib/hipe/rtl/hipe_rtl_lcm.erl67
1 files changed, 33 insertions, 34 deletions
diff --git a/lib/hipe/rtl/hipe_rtl_lcm.erl b/lib/hipe/rtl/hipe_rtl_lcm.erl
index b0ec86eef7..af39c9a0a4 100644
--- a/lib/hipe/rtl/hipe_rtl_lcm.erl
+++ b/lib/hipe/rtl/hipe_rtl_lcm.erl
@@ -182,42 +182,41 @@ delete_exprs(Code, _, _, []) ->
Code;
delete_exprs(Code, ExprMap, IdMap, [ExprId|Exprs]) ->
Expr = expr_id_map_get_expr(IdMap, ExprId),
- %% Perform a foldl that goes through the code and deletes all
- %% occurences of the expression.
- NewCode =
- lists:reverse
- (lists:foldl(fun(CodeExpr, Acc) ->
- case is_expr(CodeExpr) of
- true ->
- case expr_clear_dst(CodeExpr) =:= Expr of
- true ->
- pp_debug(" Deleting: ", []),
- pp_debug_instr(CodeExpr),
- %% Lookup expression entry.
- Defines =
- case expr_map_lookup(ExprMap, Expr) of
- {value, {_, _, Defs}} ->
- Defs;
- none ->
- exit({?MODULE, expr_map_lookup,
- "expression missing"})
- end,
- MoveCode =
- mk_expr_move_instr(hipe_rtl:defines(CodeExpr),
- Defines),
- pp_debug(" Replacing with: ", []),
- pp_debug_instr(MoveCode),
- [MoveCode|Acc];
- false ->
- [CodeExpr|Acc]
- end;
- false ->
- [CodeExpr|Acc]
- end
- end,
- [], Code)),
+ %% Lookup expression entry.
+ {value, {_, _, Defines}} = expr_map_lookup(ExprMap, Expr),
+ %% Go through the code and deletes all occurences of the expression.
+ NewCode = delete_expr(Code, Expr, Defines, []),
delete_exprs(NewCode, ExprMap, IdMap, Exprs).
+delete_expr([], _Expr, _Defines, Acc) -> lists:reverse(Acc);
+delete_expr([CodeExpr|Code], Expr, Defines, Acc) ->
+ case exp_kill_expr(CodeExpr, [Expr]) of
+ [] -> % Expr was killed; deleting stops here
+ pp_debug(" Stopping before: ", []),
+ pp_debug_instr(CodeExpr),
+ lists:reverse(Acc, [CodeExpr|Code]);
+ [Expr] ->
+ NewCodeExpr =
+ case is_expr(CodeExpr) of
+ true ->
+ case expr_clear_dst(CodeExpr) =:= Expr of
+ true ->
+ pp_debug(" Deleting: ", []),
+ pp_debug_instr(CodeExpr),
+ MoveCode = mk_expr_move_instr(hipe_rtl:defines(CodeExpr),
+ Defines),
+ pp_debug(" Replacing with: ", []),
+ pp_debug_instr(MoveCode),
+ MoveCode;
+ false ->
+ CodeExpr
+ end;
+ false ->
+ CodeExpr
+ end,
+ delete_expr(Code, Expr, Defines, [NewCodeExpr|Acc])
+ end.
+
%%=============================================================================
%% Goes through the given list of expressions and inserts them at
%% appropriate places in the code.