1 /*

     2  * Copyright (c) 2017, 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  */

    23 

    24 package org.graalvm.compiler.core.amd64;

    25 

    26 import jdk.vm.ci.code.Register;

    27 import org.graalvm.compiler.asm.amd64.AMD64Address;

    28 import org.graalvm.compiler.core.common.LIRKind;

    29 import org.graalvm.compiler.core.common.type.StampFactory;

    30 import org.graalvm.compiler.debug.CounterKey;

    31 import org.graalvm.compiler.debug.DebugContext;

    32 import org.graalvm.compiler.graph.NodeClass;

    33 import org.graalvm.compiler.nodeinfo.NodeInfo;

    34 import org.graalvm.compiler.nodes.CompressionNode;

    35 import org.graalvm.compiler.nodes.NodeView;

    36 import org.graalvm.compiler.nodes.StructuredGraph;

    37 import org.graalvm.compiler.nodes.ValueNode;

    38 import org.graalvm.compiler.nodes.calc.FloatingNode;

    39 import org.graalvm.compiler.nodes.spi.LIRLowerable;

    40 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;

    41 

    42 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;

    43 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;

    44 

    45 public abstract class AMD64CompressAddressLowering extends AMD64AddressLowering {

    46     private static final CounterKey counterFoldedUncompressDuringAddressLowering = DebugContext.counter("FoldedUncompressDuringAddressLowering");

    47 

    48     @Override

    49     protected final boolean improve(StructuredGraph graph, DebugContext debug, AMD64AddressNode addr, boolean isBaseNegated, boolean isIndexNegated) {

    50         if (super.improve(graph, debug, addr, isBaseNegated, isIndexNegated)) {

    51             return true;

    52         }

    53 

    54         if (!isBaseNegated && !isIndexNegated && addr.getScale() == AMD64Address.Scale.Times1) {

    55             ValueNode base = addr.getBase();

    56             ValueNode index = addr.getIndex();

    57 

    58             if (tryToImproveUncompression(addr, index, base) || tryToImproveUncompression(addr, base, index)) {

    59                 counterFoldedUncompressDuringAddressLowering.increment(debug);

    60                 return true;

    61             }

    62         }

    63 

    64         return false;

    65     }

    66 

    67     private boolean tryToImproveUncompression(AMD64AddressNode addr, ValueNode value, ValueNode other) {

    68         if (value instanceof CompressionNode) {

    69             CompressionNode compression = (CompressionNode) value;

    70             if (compression.getOp() == CompressionNode.CompressionOp.Uncompress && improveUncompression(addr, compression, other)) {

    71                 return true;

    72             }

    73         }

    74 

    75         return false;

    76     }

    77 

    78     protected abstract boolean improveUncompression(AMD64AddressNode addr, CompressionNode compression, ValueNode other);

    79 

    80     @NodeInfo(cycles = CYCLES_0, size = SIZE_0)

    81     public static class HeapBaseNode extends FloatingNode implements LIRLowerable {

    82 

    83         public static final NodeClass<HeapBaseNode> TYPE = NodeClass.create(HeapBaseNode.class);

    84 

    85         private final Register heapBaseRegister;

    86 

    87         public HeapBaseNode(Register heapBaseRegister) {

    88             super(TYPE, StampFactory.pointer());

    89             this.heapBaseRegister = heapBaseRegister;

    90         }

    91 

    92         @Override

    93         public void generate(NodeLIRBuilderTool generator) {

    94             LIRKind kind = generator.getLIRGeneratorTool().getLIRKind(stamp(NodeView.DEFAULT));

    95             generator.setResult(this, heapBaseRegister.asValue(kind));

    96         }

    97     }

    98 }