LinearScanRegisterAllocationPhase.java revision 13017:134219a5b0ec 
1/*
2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23package org.graalvm.compiler.lir.alloc.lsra;
24
25import org.graalvm.compiler.debug.Debug;
26import org.graalvm.compiler.debug.Indent;
27import org.graalvm.compiler.lir.gen.LIRGenerationResult;
28import org.graalvm.compiler.lir.phases.AllocationPhase.AllocationContext;
29import org.graalvm.util.Pair;
30
31import jdk.vm.ci.code.TargetDescription;
32
33public final class LinearScanRegisterAllocationPhase extends LinearScanAllocationPhase {
34
35    private final LinearScan allocator;
36
37    LinearScanRegisterAllocationPhase(LinearScan allocator) {
38        this.allocator = allocator;
39    }
40
41    @Override
42    protected void run(TargetDescription target, LIRGenerationResult result, AllocationContext context) {
43        allocator.printIntervals("Before register allocation");
44        allocateRegisters();
45        allocator.printIntervals("After register allocation");
46    }
47
48    @SuppressWarnings("try")
49    void allocateRegisters() {
50        try (Indent indent = Debug.logAndIndent("allocate registers")) {
51            Interval precoloredIntervals;
52            Interval notPrecoloredIntervals;
53
54            Pair<Interval, Interval> result = allocator.createUnhandledLists(LinearScan.IS_PRECOLORED_INTERVAL, LinearScan.IS_VARIABLE_INTERVAL);
55            precoloredIntervals = result.getLeft();
56            notPrecoloredIntervals = result.getRight();
57
58            // allocate cpu registers
59            LinearScanWalker lsw;
60            if (OptimizingLinearScanWalker.Options.LSRAOptimization.getValue(allocator.getOptions())) {
61                lsw = new OptimizingLinearScanWalker(allocator, precoloredIntervals, notPrecoloredIntervals);
62            } else {
63                lsw = new LinearScanWalker(allocator, precoloredIntervals, notPrecoloredIntervals);
64            }
65            lsw.walk();
66            lsw.finishAllocation();
67        }
68    }
69
70}
71