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