From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/hipe/regalloc/hipe_regalloc_loop.erl | 68 ++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 lib/hipe/regalloc/hipe_regalloc_loop.erl

(limited to 'lib/hipe/regalloc/hipe_regalloc_loop.erl')

diff --git a/lib/hipe/regalloc/hipe_regalloc_loop.erl b/lib/hipe/regalloc/hipe_regalloc_loop.erl
new file mode 100644
index 0000000000..428a82c87b
--- /dev/null
+++ b/lib/hipe/regalloc/hipe_regalloc_loop.erl
@@ -0,0 +1,68 @@
+%%% -*- 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%
+%%%
+%%% Common wrapper for graph_coloring and coalescing regallocs.
+
+-module(hipe_regalloc_loop).
+-export([ra/5, ra_fp/4]).
+
+%%-define(HIPE_INSTRUMENT_COMPILER, true). %% Turn on instrumentation.
+-include("../main/hipe.hrl").
+
+ra(Defun, SpillIndex, Options, RegAllocMod, TargetMod) ->
+  {NewDefun, Coloring, _NewSpillIndex} =
+    ra_common(Defun, SpillIndex, Options, RegAllocMod, TargetMod),
+  {NewDefun, Coloring}.
+
+ra_fp(Defun, Options, RegAllocMod, TargetMod) ->
+  ra_common(Defun, 0, Options, RegAllocMod, TargetMod).
+
+ra_common(Defun, SpillIndex, Options, RegAllocMod, TargetMod) ->
+  ?inc_counter(ra_calls_counter, 1),
+  CFG = TargetMod:defun_to_cfg(Defun),
+  SpillLimit = TargetMod:number_of_temporaries(CFG),
+  alloc(Defun, SpillLimit, SpillIndex, Options, RegAllocMod, TargetMod).
+
+alloc(Defun, SpillLimit, SpillIndex, Options, RegAllocMod, TargetMod) ->
+  ?inc_counter(ra_iteration_counter, 1),
+  CFG = TargetMod:defun_to_cfg(Defun),
+  {Coloring, _NewSpillIndex} =
+    RegAllocMod:regalloc(CFG, SpillIndex, SpillLimit, TargetMod, Options),
+  {NewDefun, DidSpill} = TargetMod:check_and_rewrite(Defun, Coloring),
+  case DidSpill of
+    false -> %% No new temps, we are done.
+      ?add_spills(Options, _NewSpillIndex),
+      TempMap = hipe_temp_map:cols2tuple(Coloring, TargetMod),
+      {TempMap2, NewSpillIndex2} = 
+	hipe_spillmin:stackalloc(CFG, [], SpillIndex, Options, 
+				 TargetMod, TempMap),
+      Coloring2 = 
+	hipe_spillmin:mapmerge(hipe_temp_map:to_substlist(TempMap), TempMap2),
+      %% case proplists:get_bool(verbose_spills, Options) of
+      %%   true ->
+      %%     ?msg("Num spill slots used: ~p~n", [NewSpillIndex2-SpillIndex]);
+      %%   false ->
+      %%     ok
+      %% end,
+      {NewDefun, Coloring2, NewSpillIndex2};
+    _ ->
+      %% Since SpillLimit is used as a low-water-mark
+      %% the list of temps not to spill is uninteresting.
+      alloc(NewDefun, SpillLimit, SpillIndex, Options, RegAllocMod, TargetMod)
+  end.
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