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annotate graal/com.oracle.truffle.api.dsl.test/src/com/oracle/truffle/api/dsl/test/examples/MathPow.java @ 21108:5d7a2915c96c
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author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 23 Apr 2015 17:17:52 -0700 |
parents | a79a3e467245 |
children | 9e5947d24e63 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2015, 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.truffle.api.dsl.test.examples; |
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24 |
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25 import static com.oracle.truffle.api.dsl.test.examples.ExampleNode.*; |
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26 import static org.junit.Assert.*; |
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27 |
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28 import org.junit.*; |
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29 |
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30 import com.oracle.truffle.api.*; |
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31 import com.oracle.truffle.api.dsl.*; |
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32 import com.oracle.truffle.api.dsl.test.examples.MathPowFactory.MathPowNodeGen; |
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33 import com.oracle.truffle.api.nodes.*; |
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34 |
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35 /** |
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36 * This example shows possible specializations for a simplified math pow node. It demonstrates how |
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37 * multiple caches can coexist within in the same node. This example does not show the best possible |
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38 * specializations for math.pow. |
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39 * |
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40 * Note: int values are implicitly casted to double values. |
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41 */ |
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42 @SuppressWarnings("unused") |
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43 public class MathPow extends Node { |
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44 |
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45 @Test |
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46 public void testPow() { |
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47 MathPowNode node = MathPowNodeGen.create(createArguments(2)); |
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48 CallTarget target = createTarget(node); |
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49 |
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50 // start with doPowCached |
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51 assertEquals(1D, target.call(1D, 1)); |
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52 assertEquals(2D, target.call(2D, 1)); |
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53 assertEquals(3D, target.call(3D, 1)); |
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54 assertEquals(3, node.doPowCached); |
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55 assertEquals(0, node.doPowCachedExponent); |
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56 |
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57 // transition to doPowCachedExponent |
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58 assertEquals(4D, target.call(4D, 1)); |
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59 assertEquals(5D, target.call(5D, 1)); |
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60 assertEquals(6D, target.call(6D, 1)); |
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61 assertEquals(16D, target.call(4D, 2)); |
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62 assertEquals(125D, target.call(5D, 3)); |
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63 assertEquals(5, node.doPowCachedExponent); |
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64 assertEquals(0, node.doPowDoubleInt); |
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65 |
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66 // transition to doPowDoubleInt |
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67 assertEquals(4D * 4D * 4D * 4D, target.call(4D, 4)); |
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68 assertEquals(5D * 5D * 5D * 5D * 5D, target.call(5D, 5)); |
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69 assertEquals(5, node.doPowCachedExponent); |
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70 assertEquals(2, node.doPowDoubleInt); |
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71 |
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72 // transition to doPow |
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73 assertEquals(5D, target.call(5D, 1D)); |
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74 assertEquals(2D, target.call(2D, 1D)); |
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75 |
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76 assertEquals(3, node.doPowCached); |
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77 assertEquals(5, node.doPowCachedExponent); |
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78 assertEquals(2, node.doPowDoubleInt); |
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79 assertEquals(2, node.doPow); |
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80 } |
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81 |
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82 public static class MathPowNode extends ExampleNode { |
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83 |
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84 // test flags |
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85 int doPowCached; |
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86 int doPowCachedExponent; |
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87 int doPowDoubleInt; |
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88 int doPow; |
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89 |
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90 @Specialization(guards = {"base == cachedBase", "exponent == cachedExponent"}) |
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91 double doPowCached(double base, int exponent, // |
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92 @Cached("base") double cachedBase, // |
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93 @Cached("exponent") int cachedExponent, // |
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94 @Cached("cachePow(cachedBase, cachedExponent)") double cachedResult) { |
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95 doPowCached++; |
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96 return cachedResult; |
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97 } |
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98 |
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99 /* |
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100 * We could just use the doPow specialization instead. But this makes the number of doPow |
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101 * calls more difficult to assert. |
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102 */ |
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103 protected static double cachePow(double base, int exponent) { |
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104 return Math.pow(base, exponent); |
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105 } |
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106 |
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107 @Specialization(contains = "doPowCached", guards = {"exponent == cachedExponent", "cachedExponent <= 10"}) |
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108 @ExplodeLoop |
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109 double doPowCachedExponent(double base, int exponent, @Cached("exponent") int cachedExponent) { |
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110 doPowCachedExponent++; |
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111 double result = 1.0; |
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112 for (int i = 0; i < cachedExponent; i++) { |
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113 result *= base; |
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114 } |
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115 return result; |
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116 } |
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117 |
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118 @Specialization(contains = "doPowCachedExponent", guards = "exponent >= 0") |
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119 double doPowDoubleInt(double base, int exponent) { |
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120 doPowDoubleInt++; |
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121 // Uses binary decomposition to limit the number of |
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122 // multiplications; see the discussion in "Hacker's Delight" by Henry |
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123 // S. Warren, Jr., figure 11-6, page 213. |
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124 double b = base; |
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125 int e = exponent; |
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126 double result = 1; |
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127 while (e > 0) { |
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128 if ((e & 1) == 1) { |
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129 result *= b; |
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130 } |
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131 e >>= 1; |
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132 b *= b; |
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133 } |
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134 return result; |
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135 } |
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136 |
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137 @Specialization(contains = {"doPowCached", "doPowDoubleInt"}) |
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138 double doPow(double base, double exponent) { |
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139 doPow++; |
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140 return Math.pow(base, exponent); |
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141 } |
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142 } |
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143 |
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144 } |