1 /* 2 * Copyright (C) 2011 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.math; 18 19 import static com.google.common.math.MathBenchmarking.ARRAY_MASK; 20 import static com.google.common.math.MathBenchmarking.ARRAY_SIZE; 21 import static com.google.common.math.MathBenchmarking.RANDOM_SOURCE; 22 import static com.google.common.math.MathBenchmarking.randomNonZeroBigInteger; 23 import static com.google.common.math.MathBenchmarking.randomPositiveBigInteger; 24 25 import com.google.caliper.BeforeExperiment; 26 import com.google.caliper.Benchmark; 27 import com.google.caliper.Param; 28 import com.google.common.math.IntMath; 29 30 import java.math.RoundingMode; 31 32 /** 33 * Benchmarks for the rounding methods of {@code IntMath}. 34 * 35 * @author Louis Wasserman 36 */ 37 public class IntMathRoundingBenchmark { 38 private static final int[] positive = new int[ARRAY_SIZE]; 39 private static final int[] nonzero = new int[ARRAY_SIZE]; 40 private static final int[] ints = new int[ARRAY_SIZE]; 41 42 @BeforeExperiment setUp()43 void setUp() { 44 for (int i = 0; i < ARRAY_SIZE; i++) { 45 positive[i] = randomPositiveBigInteger(Integer.SIZE - 2).intValue(); 46 nonzero[i] = randomNonZeroBigInteger(Integer.SIZE - 2).intValue(); 47 ints[i] = RANDOM_SOURCE.nextInt(); 48 } 49 } 50 51 @Param({"DOWN", "UP", "FLOOR", "CEILING", "HALF_EVEN", "HALF_UP", "HALF_DOWN"}) 52 RoundingMode mode; 53 log2(int reps)54 @Benchmark int log2(int reps) { 55 int tmp = 0; 56 for (int i = 0; i < reps; i++) { 57 int j = i & ARRAY_MASK; 58 tmp += IntMath.log2(positive[j], mode); 59 } 60 return tmp; 61 } 62 log10(int reps)63 @Benchmark int log10(int reps) { 64 int tmp = 0; 65 for (int i = 0; i < reps; i++) { 66 int j = i & ARRAY_MASK; 67 tmp += IntMath.log10(positive[j], mode); 68 } 69 return tmp; 70 } 71 sqrt(int reps)72 @Benchmark int sqrt(int reps) { 73 int tmp = 0; 74 for (int i = 0; i < reps; i++) { 75 int j = i & ARRAY_MASK; 76 tmp += IntMath.sqrt(positive[j], mode); 77 } 78 return tmp; 79 } 80 divide(int reps)81 @Benchmark int divide(int reps) { 82 int tmp = 0; 83 for (int i = 0; i < reps; i++) { 84 int j = i & ARRAY_MASK; 85 tmp += IntMath.divide(ints[j], nonzero[j], mode); 86 } 87 return tmp; 88 } 89 } 90