Mercurial > hg > graal-jvmci-8
comparison graal/Compiler/src/com/sun/c1x/ir/SignificantBitOp.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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2506:4a3bf8a5bf41 | 2507:9ec15d6914ca |
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1 /* | |
2 * Copyright (c) 2010, 2011, 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 package com.sun.c1x.ir; | |
24 | |
25 import com.sun.c1x.debug.*; | |
26 import com.sun.c1x.util.*; | |
27 import com.sun.cri.bytecode.*; | |
28 import com.sun.cri.ci.*; | |
29 | |
30 /** | |
31 * Implements the {@link Bytecodes#LSB} and {@link Bytecodes#MSB} instructions. | |
32 * | |
33 * @author Laurent Daynes | |
34 */ | |
35 public class SignificantBitOp extends Instruction { | |
36 Value value; | |
37 | |
38 /** | |
39 * This will be {@link Bytecodes#LSB} or {@link Bytecodes#MSB}. | |
40 */ | |
41 public final int op; | |
42 | |
43 /** | |
44 * Create a a new SignificantBitOp instance. | |
45 * | |
46 * @param value the instruction producing the value that is input to this instruction | |
47 * @param opcodeop either {@link Bytecodes#LSB} or {@link Bytecodes#MSB} | |
48 */ | |
49 public SignificantBitOp(Value value, int opcodeop) { | |
50 super(CiKind.Int); | |
51 assert opcodeop == Bytecodes.LSB || opcodeop == Bytecodes.MSB; | |
52 this.value = value; | |
53 this.op = opcodeop; | |
54 } | |
55 | |
56 /** | |
57 * Gets the instruction producing input to this instruction. | |
58 * @return the instruction that produces this instruction's input | |
59 */ | |
60 public Value value() { | |
61 return value; | |
62 } | |
63 | |
64 @Override | |
65 public void inputValuesDo(ValueClosure closure) { | |
66 value = closure.apply(value); | |
67 } | |
68 | |
69 @Override | |
70 public void accept(ValueVisitor v) { | |
71 v.visitSignificantBit(this); | |
72 } | |
73 | |
74 @Override | |
75 public int valueNumber() { | |
76 return Util.hash1(op, value); | |
77 } | |
78 | |
79 @Override | |
80 public boolean valueEqual(Instruction i) { | |
81 if (i instanceof SignificantBitOp) { | |
82 SignificantBitOp o = (SignificantBitOp) i; | |
83 // FIXME: this is a conservative estimate. If x is a single-bit value | |
84 // (i.e., a power of 2), then the values are equal regardless of the value of the most field. | |
85 return value == o.value && op == o.op; | |
86 } | |
87 return false; | |
88 } | |
89 | |
90 @Override | |
91 public void print(LogStream out) { | |
92 out.print(Bytecodes.nameOf(op) + " [").print(this).print("] "); | |
93 } | |
94 } |