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Use all variables: a, b, u,v and x, y
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents 5309cc9668e3
children
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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.createArguments;
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26 import static com.oracle.truffle.api.dsl.test.examples.ExampleNode.createTarget;
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27 import static org.junit.Assert.assertEquals;
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28
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29 import org.junit.Test;
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30
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31 import com.oracle.truffle.api.CallTarget;
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32 import com.oracle.truffle.api.dsl.Cached;
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33 import com.oracle.truffle.api.dsl.Specialization;
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34 import com.oracle.truffle.api.dsl.test.examples.MathPowFactory.MathPowNodeGen;
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35 import com.oracle.truffle.api.nodes.Node;
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36
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37 /**
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38 * This example shows possible specializations for a simplified math pow node. It demonstrates how
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39 * multiple caches can coexist within in the same node. This example does not show the best possible
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40 * specializations for math.pow.
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41 *
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42 * Note: int values are implicitly casted to double values.
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43 */
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44 @SuppressWarnings("unused")
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45 public class MathPow extends Node {
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46
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47 @Test
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48 public void testPow() {
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49 MathPowNode node = MathPowNodeGen.create(createArguments(2));
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50 CallTarget target = createTarget(node);
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51
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52 // start with doPowCached
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53 assertEquals(1D, target.call(1D, 1));
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54 assertEquals(2D, target.call(2D, 1));
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55 assertEquals(3D, target.call(3D, 1));
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56 assertEquals(3, node.doPowCached);
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57 assertEquals(0, node.doPowCachedExponent);
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58
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59 // transition to doPowCachedExponent
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60 assertEquals(4D, target.call(4D, 1));
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61 assertEquals(5D, target.call(5D, 1));
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62 assertEquals(6D, target.call(6D, 1));
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63 assertEquals(16D, target.call(4D, 2));
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64 assertEquals(125D, target.call(5D, 3));
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65 assertEquals(5, node.doPowCachedExponent);
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66 assertEquals(0, node.doPowDoubleInt);
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67
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68 // transition to doPowDoubleInt
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69 assertEquals(4D * 4D * 4D * 4D, target.call(4D, 4));
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70 assertEquals(5D * 5D * 5D * 5D * 5D, target.call(5D, 5));
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71 assertEquals(5, node.doPowCachedExponent);
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72 assertEquals(2, node.doPowDoubleInt);
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73
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74 // transition to doPow
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75 assertEquals(5D, target.call(5D, 1D));
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76 assertEquals(2D, target.call(2D, 1D));
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77
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78 assertEquals(3, node.doPowCached);
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79 assertEquals(5, node.doPowCachedExponent);
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80 assertEquals(2, node.doPowDoubleInt);
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81 assertEquals(2, node.doPow);
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82 }
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83
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84 public static class MathPowNode extends ExampleNode {
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85
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86 // test flags
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87 int doPowCached;
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88 int doPowCachedExponent;
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89 int doPowDoubleInt;
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90 int doPow;
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91
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92 @Specialization(guards = {"base == cachedBase", "exponent == cachedExponent"})
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93 double doPowCached(double base, int exponent, //
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94 @Cached("base") double cachedBase, //
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95 @Cached("exponent") int cachedExponent, //
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96 @Cached("cachePow(cachedBase, cachedExponent)") double cachedResult) {
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97 doPowCached++;
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98 return cachedResult;
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99 }
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100
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101 /*
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102 * We could just use the doPow specialization instead. But this makes the number of doPow
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103 * calls more difficult to assert.
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104 */
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105 protected static double cachePow(double base, int exponent) {
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106 return Math.pow(base, exponent);
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107 }
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108
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109 @Specialization(contains = "doPowCached", guards = {"exponent == cachedExponent", "cachedExponent <= 10"})
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110 double doPowCachedExponent(double base, int exponent, @Cached("exponent") int cachedExponent) {
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111 doPowCachedExponent++;
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112 double result = 1.0;
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113 for (int i = 0; i < cachedExponent; i++) {
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114 result *= base;
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115 }
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116 return result;
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117 }
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118
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119 @Specialization(contains = "doPowCachedExponent", guards = "exponent >= 0")
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120 double doPowDoubleInt(double base, int exponent) {
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121 doPowDoubleInt++;
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122 // Uses binary decomposition to limit the number of
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123 // multiplications; see the discussion in "Hacker's Delight" by Henry
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124 // S. Warren, Jr., figure 11-6, page 213.
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125 double b = base;
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126 int e = exponent;
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127 double result = 1;
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128 while (e > 0) {
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129 if ((e & 1) == 1) {
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130 result *= b;
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131 }
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132 e >>= 1;
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133 b *= b;
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134 }
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135 return result;
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136 }
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137
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138 @Specialization(contains = {"doPowCached", "doPowDoubleInt"})
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139 double doPow(double base, double exponent) {
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140 doPow++;
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141 return Math.pow(base, exponent);
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142 }
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143 }
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144
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145 }