diff options
Diffstat (limited to 'lib/hipe/rtl/hipe_rtl_cleanup_const.erl')
-rw-r--r-- | lib/hipe/rtl/hipe_rtl_cleanup_const.erl | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/lib/hipe/rtl/hipe_rtl_cleanup_const.erl b/lib/hipe/rtl/hipe_rtl_cleanup_const.erl new file mode 100644 index 0000000000..d3e71a56c1 --- /dev/null +++ b/lib/hipe/rtl/hipe_rtl_cleanup_const.erl @@ -0,0 +1,85 @@ +%%% -*- erlang-indent-level: 2 -*- +%%% +%%% %CopyrightBegin% +%%% +%%% Copyright Ericsson AB 2004-2009. All Rights Reserved. +%%% +%%% The contents of this file are subject to the Erlang Public License, +%%% Version 1.1, (the "License"); you may not use this file except in +%%% compliance with the License. You should have received a copy of the +%%% Erlang Public License along with this software. If not, it can be +%%% retrieved online at http://www.erlang.org/. +%%% +%%% Software distributed under the License is distributed on an "AS IS" +%%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%%% the License for the specific language governing rights and limitations +%%% under the License. +%%% +%%% %CopyrightEnd% +%%% +%%%------------------------------------------------------------------- +%%% File : hipe_rtl_cleanup_const.erl +%%% Author : Tobias Lindahl <[email protected]> +%%% Description : +%%% +%%% Created : 5 Mar 2004 by Tobias Lindahl <[email protected]> +%%%------------------------------------------------------------------- + +%% 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 instruction that currently can access +%% them is load_address, the constants have to be moved out of the +%% instruction and loaded into temporary variables 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"). + +%%-------------------------------------------------------------------- + +%%-spec cleanup(#rtl{}) -> #rtl{}. + +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) -> + Dst = hipe_rtl:mk_new_var(), + ConstLabel = hipe_rtl:const_label_label(Const), + Load = hipe_rtl:mk_load_address(Dst, ConstLabel, constant), + case I of + X when is_record(X, fp_unop) orelse is_record(X, fp) -> + 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]); + _ -> + NewI = hipe_rtl:subst_uses([{Const, Dst}], I), + cleanup_instr(Left, NewI, [Load|Acc]) + end; +cleanup_instr([], I, Acc) -> + [I|Acc]. |