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%%%-------------------------------------------------------------------
%%% File : hipe_rtl_cleanup_const.erl
%%% Author : Tobias Lindahl <tobiasl@csd.uu.se>
%%% Description :
%%%
%%% Created : 5 Mar 2004 by Tobias Lindahl <tobiasl@csd.uu.se>
%%%-------------------------------------------------------------------
%% Big constants (floats, bignums) can be used as arguments to
%% arbitrary instructions in rtl. Since these are located in the
%% constants area and the only intruction that currently can access
%% them is load_address, the constants has to be moved out of the
%% intruction and loaded into a temporary variable before the
%% instruction.
%%
%% Some backends can make use of the information that the arguments
%% are really constants. Here is the place to add new backend-specific
%% behaviour depending on this.
-module(hipe_rtl_cleanup_const).
-export([cleanup/1]).
-include("hipe_rtl.hrl").
cleanup(Rtl) ->
Code = cleanup(hipe_rtl:rtl_code(Rtl), []),
hipe_rtl:rtl_code_update(Rtl, Code).
cleanup([I|Left], Acc) ->
Args = hipe_rtl:args(I),
case [X || X <- Args, hipe_rtl:is_const_label(X)] of
[] ->
cleanup(Left, [I|Acc]);
ConstArgs ->
NewIns = cleanup_instr(ConstArgs, I),
cleanup(Left, NewIns ++ Acc)
end;
cleanup([], Acc) ->
lists:reverse(Acc).
cleanup_instr(Consts, I) ->
cleanup_instr(ordsets:from_list(Consts), I, []).
cleanup_instr([Const|Left], I, Acc) ->
case I of
X when is_record(X, fp_unop) ; is_record(X, fp) ->
Dst = hipe_rtl:mk_new_var(),
ConstLabel = hipe_rtl:const_label_label(Const),
Load = hipe_rtl:mk_load_address(Dst, ConstLabel, constant),
Fdst = hipe_rtl:mk_new_fpreg(),
Fconv = hipe_tagscheme:unsafe_untag_float(Fdst, Dst),
NewI = hipe_rtl:subst_uses([{Const, Fdst}], I),
cleanup_instr(Left, NewI, Fconv ++ [Load|Acc]);
_ ->
Dst = hipe_rtl:mk_new_var(),
ConstLabel = hipe_rtl:const_label_label(Const),
Load = hipe_rtl:mk_load_address(Dst, ConstLabel, constant),
NewI = hipe_rtl:subst_uses([{Const, Dst}], I),
cleanup_instr(Left, NewI, [Load|Acc])
end;
cleanup_instr([], I, Acc) ->
[I|Acc].
|
