%%% -*- erlang-indent-level: 2 -*-
%%%
%%% Licensed under the Apache License, Version 2.0 (the "License");
%%% you may not use this file except in compliance with the License.
%%% You may obtain a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing, software
%%% distributed under the License is distributed on an "AS IS" BASIS,
%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%% See the License for the specific language governing permissions and
%%% limitations under the License.
%%%
%%% Linear Scan register allocator for ARM
-module(hipe_arm_ra_ls).
-export([ra/4]).
ra(CFG, Liveness, SpillIndex, Options) ->
SpillLimit = hipe_arm_specific:number_of_temporaries(CFG, no_context),
alloc(CFG, Liveness, SpillIndex, SpillLimit, Options).
alloc(CFG, Liveness, SpillIndex, SpillLimit, Options) ->
{Coloring, _NewSpillIndex} =
regalloc(
CFG, Liveness,
hipe_arm_registers:allocatable_gpr()--
[hipe_arm_registers:temp3(),
hipe_arm_registers:temp2(),
hipe_arm_registers:temp1()],
[hipe_arm_cfg:start_label(CFG)],
SpillIndex, SpillLimit, Options,
hipe_arm_specific, no_context),
{NewCFG, _DidSpill} =
hipe_arm_ra_postconditions:check_and_rewrite(
CFG, Coloring, 'linearscan'),
TempMap = hipe_temp_map:cols2tuple(Coloring, hipe_arm_specific, no_context),
{SpillMap, _NewSpillIndex2} =
hipe_spillmin:stackalloc(CFG, Liveness, [], SpillIndex, Options,
hipe_arm_specific, no_context, TempMap),
Coloring2 =
hipe_spillmin:mapmerge(hipe_temp_map:to_substlist(TempMap), SpillMap),
{NewCFG, Liveness, Coloring2}.
regalloc(CFG, Liveness, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options,
TgtMod, TgtCtx) ->
hipe_ls_regalloc:regalloc(CFG, Liveness, PhysRegs, Entrypoints, SpillIndex,
DontSpill, Options, TgtMod, TgtCtx).
