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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/StampTool.java @ 12538:ae36dae46d50

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Fix StampTool.unsignedRightShift
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 23 Oct 2013 11:49:01 +0200
parents 9088d13767f3
children 035474349265
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.nodes.type;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28
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29 /**
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30 * Helper class that is used to keep all stamp-related operations in one place.
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31 */
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32 public class StampTool {
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33
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34 public static Kind joinKind(Kind a, Kind b) {
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35 if (a == b) {
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36 return a;
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37 }
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38 return Kind.Illegal;
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39 }
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40
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41 public static Kind joinKind(Stamp a, Stamp b) {
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42 return joinKind(a.kind(), b.kind());
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43 }
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44
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45 public static Stamp negate(Stamp stamp) {
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46 Kind kind = stamp.kind();
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47 if (stamp instanceof IntegerStamp) {
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48 IntegerStamp integerStamp = (IntegerStamp) stamp;
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49 if (integerStamp.lowerBound() != kind.getMinValue()) {
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50 // TODO(ls) check if the mask calculation is correct...
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51 return StampFactory.forInteger(kind, -integerStamp.upperBound(), -integerStamp.lowerBound());
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52 }
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53 } else if (stamp instanceof FloatStamp) {
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54 FloatStamp floatStamp = (FloatStamp) stamp;
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55 return new FloatStamp(kind, -floatStamp.upperBound(), -floatStamp.lowerBound(), floatStamp.isNonNaN());
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56 }
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57
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58 return StampFactory.forKind(kind);
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59 }
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60
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61 public static Stamp not(Stamp stamp) {
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62 if (stamp instanceof IntegerStamp) {
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63 IntegerStamp integerStamp = (IntegerStamp) stamp;
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64 assert stamp.kind() == Kind.Int || stamp.kind() == Kind.Long;
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65 long defaultMask = IntegerStamp.defaultMask(stamp.kind());
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66 return new IntegerStamp(stamp.kind(), ~integerStamp.upperBound(), ~integerStamp.lowerBound(), (~integerStamp.upMask()) & defaultMask, (~integerStamp.downMask()) & defaultMask);
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67 }
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68 return StampFactory.forKind(stamp.kind());
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69 }
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70
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71 public static Stamp meet(Collection<? extends StampProvider> values) {
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72 Iterator<? extends StampProvider> iterator = values.iterator();
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73 if (iterator.hasNext()) {
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74 Stamp stamp = iterator.next().stamp();
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75 while (iterator.hasNext()) {
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76 stamp = stamp.meet(iterator.next().stamp());
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77 }
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78 return stamp;
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79 } else {
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80 return StampFactory.forVoid();
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81 }
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82 }
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83
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84 public static Stamp add(Stamp stamp1, Stamp stamp2) {
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85 if (stamp1 instanceof IntegerStamp && stamp2 instanceof IntegerStamp) {
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86 return add((IntegerStamp) stamp1, (IntegerStamp) stamp2);
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87 }
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88 return StampFactory.illegal(joinKind(stamp1, stamp2));
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89 }
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90
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91 private static long carryBits(long x, long y) {
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92 return (x + y) ^ x ^ y;
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93 }
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94
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95 public static Stamp sub(Stamp stamp1, Stamp stamp2) {
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96 return add(stamp1, StampTool.negate(stamp2));
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97 }
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98
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99 public static Stamp div(Stamp stamp1, Stamp stamp2) {
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100 if (stamp1 instanceof IntegerStamp && stamp2 instanceof IntegerStamp) {
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101 return div((IntegerStamp) stamp1, (IntegerStamp) stamp2);
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102 }
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103 return StampFactory.illegal(joinKind(stamp1, stamp2));
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104 }
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105
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106 public static Stamp div(IntegerStamp stamp1, IntegerStamp stamp2) {
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107 assert stamp1.kind() == stamp2.kind();
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108 Kind kind = stamp1.kind();
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109 if (stamp2.isStrictlyPositive()) {
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110 long lowerBound = stamp1.lowerBound() / stamp2.lowerBound();
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111 long upperBound = stamp1.upperBound() / stamp2.lowerBound();
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112 return StampFactory.forInteger(kind, lowerBound, upperBound);
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113 }
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114 return StampFactory.forKind(kind);
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115 }
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116
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117 private static boolean addOverflows(long x, long y, Kind kind) {
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118 long result = x + y;
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119 if (kind == Kind.Long) {
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120 return ((x ^ result) & (y ^ result)) < 0;
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121 } else {
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122 assert kind == Kind.Int;
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123 return result > Integer.MAX_VALUE || result < Integer.MIN_VALUE;
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parents:
diff changeset
124 }
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
125 }
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
126
11352
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diff changeset
127 public static IntegerStamp add(IntegerStamp stamp1, IntegerStamp stamp2) {
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parents: 11265
diff changeset
128 try {
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diff changeset
129 if (stamp1.isUnrestricted() || stamp2.isUnrestricted()) {
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parents: 11265
diff changeset
130 return (IntegerStamp) StampFactory.forKind(stamp1.kind());
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parents: 11265
diff changeset
131 }
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Lukas Stadler <lukas.stadler@jku.at>
parents: 11265
diff changeset
132 Kind kind = stamp1.kind();
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parents: 11265
diff changeset
133 assert stamp1.kind() == stamp2.kind();
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parents: 11265
diff changeset
134 long defaultMask = IntegerStamp.defaultMask(kind);
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parents: 11265
diff changeset
135 long variableBits = (stamp1.downMask() ^ stamp1.upMask()) | (stamp2.downMask() ^ stamp2.upMask());
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Lukas Stadler <lukas.stadler@jku.at>
parents: 11265
diff changeset
136 long variableBitsWithCarry = variableBits | (carryBits(stamp1.downMask(), stamp2.downMask()) ^ carryBits(stamp1.upMask(), stamp2.upMask()));
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Lukas Stadler <lukas.stadler@jku.at>
parents: 11265
diff changeset
137 long newDownMask = (stamp1.downMask() + stamp2.downMask()) & ~variableBitsWithCarry;
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parents: 11265
diff changeset
138 long newUpMask = (stamp1.downMask() + stamp2.downMask()) | variableBitsWithCarry;
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parents: 11265
diff changeset
139
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diff changeset
140 newDownMask &= defaultMask;
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parents: 11265
diff changeset
141 newUpMask &= defaultMask;
5657
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parents:
diff changeset
142
11352
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diff changeset
143 long lowerBound;
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diff changeset
144 long upperBound;
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diff changeset
145 if (addOverflows(stamp1.lowerBound(), stamp2.lowerBound(), kind) || addOverflows(stamp1.upperBound(), stamp2.upperBound(), kind)) {
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parents: 11265
diff changeset
146 lowerBound = kind.getMinValue();
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parents: 11265
diff changeset
147 upperBound = kind.getMaxValue();
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parents: 11265
diff changeset
148 } else {
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diff changeset
149 lowerBound = stamp1.lowerBound() + stamp2.lowerBound();
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parents: 11265
diff changeset
150 upperBound = stamp1.upperBound() + stamp2.upperBound();
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diff changeset
151 }
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parents: 11265
diff changeset
152 IntegerStamp limit = StampFactory.forInteger(kind, lowerBound, upperBound);
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diff changeset
153 newUpMask &= limit.upMask();
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diff changeset
154 return new IntegerStamp(kind, lowerBound | newDownMask, signExtend(upperBound & newUpMask, kind), newDownMask, newUpMask);
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parents: 11265
diff changeset
155 } catch (Throwable e) {
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parents: 11265
diff changeset
156 throw new RuntimeException(stamp1 + " + " + stamp2, e);
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parents: 11265
diff changeset
157 }
10045
a4e7a7dc74f3 better stamps for OrNodes
Lukas Stadler <lukas.stadler@jku.at>
parents: 7530
diff changeset
158 }
a4e7a7dc74f3 better stamps for OrNodes
Lukas Stadler <lukas.stadler@jku.at>
parents: 7530
diff changeset
159
11352
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diff changeset
160 public static Stamp sub(IntegerStamp stamp1, IntegerStamp stamp2) {
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diff changeset
161 if (stamp1.isUnrestricted() || stamp2.isUnrestricted()) {
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diff changeset
162 return StampFactory.forKind(stamp1.kind());
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diff changeset
163 }
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parents: 11265
diff changeset
164 return add(stamp1, (IntegerStamp) StampTool.negate(stamp2));
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diff changeset
165 }
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parents: 11265
diff changeset
166
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parents: 11265
diff changeset
167 private static Stamp stampForMask(Kind kind, long downMask, long upMask) {
5657
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
168 long lowerBound;
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
169 long upperBound;
11352
8185c119d731 "always set" bit mask on IntegerStamps
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diff changeset
170 if (((upMask >>> (kind.getBitCount() - 1)) & 1) == 0) {
8185c119d731 "always set" bit mask on IntegerStamps
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parents: 11265
diff changeset
171 lowerBound = downMask;
8185c119d731 "always set" bit mask on IntegerStamps
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parents: 11265
diff changeset
172 upperBound = upMask;
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parents: 11265
diff changeset
173 } else if (((downMask >>> (kind.getBitCount() - 1)) & 1) == 1) {
8185c119d731 "always set" bit mask on IntegerStamps
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parents: 11265
diff changeset
174 lowerBound = downMask;
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parents: 11265
diff changeset
175 upperBound = upMask;
5657
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
176 } else {
11357
307eec0f460f fix incorrect lower bound in StampTool
Lukas Stadler <lukas.stadler@jku.at>
parents: 11356
diff changeset
177 lowerBound = downMask | (-1L << (kind.getBitCount() - 1));
11352
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diff changeset
178 upperBound = kind.getMaxValue() & upMask;
5657
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parents:
diff changeset
179 }
11352
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diff changeset
180 if (kind == Kind.Int) {
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parents: 11265
diff changeset
181 return StampFactory.forInteger(kind, (int) lowerBound, (int) upperBound, downMask, upMask);
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parents: 11265
diff changeset
182 } else {
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parents: 11265
diff changeset
183 return StampFactory.forInteger(kind, lowerBound, upperBound, downMask, upMask);
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parents: 11265
diff changeset
184 }
5657
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parents:
diff changeset
185 }
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parents:
diff changeset
186
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ef6915cf1e59 Add illegal stamp
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diff changeset
187 public static Stamp and(Stamp stamp1, Stamp stamp2) {
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diff changeset
188 if (stamp1 instanceof IntegerStamp && stamp2 instanceof IntegerStamp) {
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parents: 10815
diff changeset
189 return and((IntegerStamp) stamp1, (IntegerStamp) stamp2);
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diff changeset
190 }
11387
9088d13767f3 Keep a kind in the illegal stamp
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parents: 11357
diff changeset
191 return StampFactory.illegal(joinKind(stamp1, stamp2));
11265
ef6915cf1e59 Add illegal stamp
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parents: 10815
diff changeset
192 }
ef6915cf1e59 Add illegal stamp
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parents: 10815
diff changeset
193
5657
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
194 public static Stamp and(IntegerStamp stamp1, IntegerStamp stamp2) {
11352
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parents: 11265
diff changeset
195 assert stamp1.kind() == stamp2.kind();
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parents: 11265
diff changeset
196 return stampForMask(stamp1.kind(), stamp1.downMask() & stamp2.downMask(), stamp1.upMask() & stamp2.upMask());
5657
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
197 }
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
198
11265
ef6915cf1e59 Add illegal stamp
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parents: 10815
diff changeset
199 public static Stamp or(Stamp stamp1, Stamp stamp2) {
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
200 if (stamp1 instanceof IntegerStamp && stamp2 instanceof IntegerStamp) {
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
201 return or((IntegerStamp) stamp1, (IntegerStamp) stamp2);
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
202 }
11387
9088d13767f3 Keep a kind in the illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11357
diff changeset
203 return StampFactory.illegal(joinKind(stamp1, stamp2));
11265
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
204 }
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
205
5657
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
206 public static Stamp or(IntegerStamp stamp1, IntegerStamp stamp2) {
11352
8185c119d731 "always set" bit mask on IntegerStamps
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parents: 11265
diff changeset
207 assert stamp1.kind() == stamp2.kind();
8185c119d731 "always set" bit mask on IntegerStamps
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parents: 11265
diff changeset
208 return stampForMask(stamp1.kind(), stamp1.downMask() | stamp2.downMask(), stamp1.upMask() | stamp2.upMask());
5657
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
209 }
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
210
11265
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
211 public static Stamp xor(Stamp stamp1, Stamp stamp2) {
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
212 if (stamp1 instanceof IntegerStamp && stamp2 instanceof IntegerStamp) {
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
213 return xor((IntegerStamp) stamp1, (IntegerStamp) stamp2);
ef6915cf1e59 Add illegal stamp
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parents: 10815
diff changeset
214 }
11387
9088d13767f3 Keep a kind in the illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11357
diff changeset
215 return StampFactory.illegal(joinKind(stamp1, stamp2));
11265
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
216 }
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
217
7489
8461d937ac18 Better for Load/Read stamps for non-stack kinds
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 7302
diff changeset
218 public static Stamp xor(IntegerStamp stamp1, IntegerStamp stamp2) {
11352
8185c119d731 "always set" bit mask on IntegerStamps
Lukas Stadler <lukas.stadler@jku.at>
parents: 11265
diff changeset
219 assert stamp1.kind() == stamp2.kind();
8185c119d731 "always set" bit mask on IntegerStamps
Lukas Stadler <lukas.stadler@jku.at>
parents: 11265
diff changeset
220 long variableBits = (stamp1.downMask() ^ stamp1.upMask()) | (stamp2.downMask() ^ stamp2.upMask());
8185c119d731 "always set" bit mask on IntegerStamps
Lukas Stadler <lukas.stadler@jku.at>
parents: 11265
diff changeset
221 long newDownMask = (stamp1.downMask() ^ stamp2.downMask()) & ~variableBits;
8185c119d731 "always set" bit mask on IntegerStamps
Lukas Stadler <lukas.stadler@jku.at>
parents: 11265
diff changeset
222 long newUpMask = (stamp1.downMask() ^ stamp2.downMask()) | variableBits;
8185c119d731 "always set" bit mask on IntegerStamps
Lukas Stadler <lukas.stadler@jku.at>
parents: 11265
diff changeset
223 return stampForMask(stamp1.kind(), newDownMask, newUpMask);
7489
8461d937ac18 Better for Load/Read stamps for non-stack kinds
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 7302
diff changeset
224 }
8461d937ac18 Better for Load/Read stamps for non-stack kinds
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 7302
diff changeset
225
11265
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
226 public static Stamp unsignedRightShift(Stamp value, Stamp shift) {
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
227 if (value instanceof IntegerStamp && shift instanceof IntegerStamp) {
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
228 return unsignedRightShift((IntegerStamp) value, (IntegerStamp) shift);
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
229 }
11387
9088d13767f3 Keep a kind in the illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11357
diff changeset
230 return StampFactory.illegal(value.kind());
11265
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
231 }
ef6915cf1e59 Add illegal stamp
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 10815
diff changeset
232
5657
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
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parents:
diff changeset
233 public static Stamp unsignedRightShift(IntegerStamp value, IntegerStamp shift) {
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
234 Kind kind = value.kind();
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
235 if (shift.lowerBound() == shift.upperBound()) {
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
236 long shiftMask = kind == Kind.Int ? 0x1FL : 0x3FL;
d71eb56d6bb0 new stamp inference in CanonicalizerPhase, IntegerStamp.mask
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
237 long shiftCount = shift.lowerBound() & shiftMask;
7302
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
238 if (shiftCount != 0) {
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
239 long lowerBound;
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
240 long upperBound;
12538
ae36dae46d50 Fix StampTool.unsignedRightShift
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11387
diff changeset
241 long downMask = value.downMask() >>> shiftCount;
7302
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
242 if (value.lowerBound() < 0) {
12538
ae36dae46d50 Fix StampTool.unsignedRightShift
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 11387
diff changeset
243 lowerBound = downMask;
7302
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
244 upperBound = IntegerStamp.defaultMask(kind) >>> shiftCount;
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
245 } else {
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
246 lowerBound = value.lowerBound() >>> shiftCount;
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
247 upperBound = value.upperBound() >>> shiftCount;
f9f40467383e Fixes for new Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6539
diff changeset
248 }
12538
ae36dae46d50 Fix StampTool.unsignedRightShift
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249 return new IntegerStamp(kind, lowerBound, upperBound, downMask, value.upMask() >>> shiftCount);
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250 }
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251 }
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252 long mask = IntegerStamp.upMaskFor(kind, value.lowerBound(), value.upperBound());
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253 return stampForMask(kind, 0, mask);
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254 }
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255
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256 public static Stamp leftShift(Stamp value, Stamp shift) {
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257 if (value instanceof IntegerStamp && shift instanceof IntegerStamp) {
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258 return leftShift((IntegerStamp) value, (IntegerStamp) shift);
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259 }
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9088d13767f3 Keep a kind in the illegal stamp
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260 return StampFactory.illegal(value.kind());
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261 }
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262
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263 public static Stamp leftShift(IntegerStamp value, IntegerStamp shift) {
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264 Kind kind = value.kind();
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265 long defaultMask = IntegerStamp.defaultMask(kind);
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266 if (value.upMask() == 0) {
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267 return value;
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268 }
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269 int shiftBits = kind == Kind.Int ? 5 : 6;
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270 long shiftMask = kind == Kind.Int ? 0x1FL : 0x3FL;
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271 if ((shift.lowerBound() >>> shiftBits) == (shift.upperBound() >>> shiftBits)) {
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272 long downMask = defaultMask;
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273 long upMask = 0;
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274 for (long i = shift.lowerBound(); i <= shift.upperBound(); i++) {
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275 if (shift.contains(i)) {
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276 downMask &= value.downMask() << (i & shiftMask);
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277 upMask |= value.upMask() << (i & shiftMask);
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278 }
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279 }
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280 Stamp result = stampForMask(kind, downMask, upMask & IntegerStamp.defaultMask(kind));
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281 return result;
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282 }
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283 return StampFactory.forKind(kind);
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284 }
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285
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286 public static Stamp intToLong(IntegerStamp intStamp) {
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287 return StampFactory.forInteger(Kind.Long, intStamp.lowerBound(), intStamp.upperBound(), signExtend(intStamp.downMask(), Kind.Int), signExtend(intStamp.upMask(), Kind.Int));
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288 }
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289
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290 private static IntegerStamp narrowingKindConvertion(IntegerStamp fromStamp, Kind toKind) {
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291 assert toKind == Kind.Byte || toKind == Kind.Char || toKind == Kind.Short || toKind == Kind.Int;
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292 final long upperBound;
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293 if (fromStamp.lowerBound() < toKind.getMinValue()) {
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294 upperBound = toKind.getMaxValue();
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295 } else {
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296 upperBound = saturate(fromStamp.upperBound(), toKind);
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297 }
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298 final long lowerBound;
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299 if (fromStamp.upperBound() > toKind.getMaxValue()) {
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diff changeset
300 lowerBound = toKind.getMinValue();
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301 } else {
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302 lowerBound = saturate(fromStamp.lowerBound(), toKind);
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303 }
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304
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305 long defaultMask = IntegerStamp.defaultMask(toKind);
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diff changeset
306 long intMask = IntegerStamp.defaultMask(Kind.Int);
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307 long newUpMask = signExtend(fromStamp.upMask() & defaultMask, toKind) & intMask;
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diff changeset
308 long newDownMask = signExtend(fromStamp.downMask() & defaultMask, toKind) & intMask;
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309 return new IntegerStamp(toKind.getStackKind(), (int) ((lowerBound | newDownMask) & newUpMask), (int) ((upperBound | newDownMask) & newUpMask), newDownMask, newUpMask);
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310 }
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311
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312 private static long signExtend(long value, Kind valueKind) {
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313 if (valueKind != Kind.Char && (value >>> (valueKind.getBitCount() - 1) & 1) == 1) {
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314 return value | (-1L << valueKind.getBitCount());
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315 } else {
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316 return value;
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317 }
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318 }
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319
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320 public static IntegerStamp intToByte(IntegerStamp intStamp) {
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321 assert intStamp.kind() == Kind.Int;
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322 return narrowingKindConvertion(intStamp, Kind.Byte);
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323 }
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diff changeset
324
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325 public static IntegerStamp intToShort(IntegerStamp intStamp) {
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326 assert intStamp.kind() == Kind.Int;
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diff changeset
327 return narrowingKindConvertion(intStamp, Kind.Short);
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diff changeset
328 }
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parents: 6299
diff changeset
329
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330 public static IntegerStamp intToChar(IntegerStamp intStamp) {
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331 assert intStamp.kind() == Kind.Int;
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diff changeset
332 return narrowingKindConvertion(intStamp, Kind.Char);
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diff changeset
333 }
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diff changeset
334
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diff changeset
335 public static IntegerStamp longToInt(IntegerStamp longStamp) {
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336 assert longStamp.kind() == Kind.Long;
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diff changeset
337 return narrowingKindConvertion(longStamp, Kind.Int);
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diff changeset
338 }
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diff changeset
339
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diff changeset
340 public static long saturate(long v, Kind kind) {
6328
6e66d97a16ae Clean up Kind class.
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diff changeset
341 long max = kind.getMaxValue();
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diff changeset
342 if (v > max) {
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343 return max;
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diff changeset
344 }
6328
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
345 long min = kind.getMinValue();
6313
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diff changeset
346 if (v < min) {
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diff changeset
347 return min;
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diff changeset
348 }
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diff changeset
349 return v;
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350 }
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parents:
diff changeset
351 }