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+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+/*
+ * Micro-benchmark for Math.pow() and Math.exp()
+ */
+
+import java.util.*;
+
+public class Test7177917 {
+
+ static double d;
+
+ static Random r = new Random(0);
+
+ static long m_pow(double[][] values) {
+ double res = 0;
+ long start = System.nanoTime();
+ for (int i = 0; i < values.length; i++) {
+ res += Math.pow(values[i][0], values[i][1]);
+ }
+ long stop = System.nanoTime();
+ d = res;
+ return (stop - start) / 1000;
+ }
+
+ static long m_exp(double[] values) {
+ double res = 0;
+ long start = System.nanoTime();
+ for (int i = 0; i < values.length; i++) {
+ res += Math.exp(values[i]);
+ }
+ long stop = System.nanoTime();
+ d = res;
+ return (stop - start) / 1000;
+ }
+
+ static double[][] pow_values(int nb) {
+ double[][] res = new double[nb][2];
+ for (int i = 0; i < nb; i++) {
+ double ylogx = (1 + (r.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
+ double x = Math.abs(Double.longBitsToDouble(r.nextLong()));
+ while (x != x) {
+ x = Math.abs(Double.longBitsToDouble(r.nextLong()));
+ }
+ double logx = Math.log(x) / Math.log(2);
+ double y = ylogx / logx;
+
+ res[i][0] = x;
+ res[i][1] = y;
+ }
+ return res;
+ }
+
+ static double[] exp_values(int nb) {
+ double[] res = new double[nb];
+ for (int i = 0; i < nb; i++) {
+ double ylogx = (1 + (r.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
+ double x = Math.E;
+ double logx = Math.log(x) / Math.log(2);
+ double y = ylogx / logx;
+ res[i] = y;
+ }
+ return res;
+ }
+
+ static public void main(String[] args) {
+ {
+ // warmup
+ double[][] warmup_values = pow_values(10);
+ m_pow(warmup_values);
+
+ for (int i = 0; i < 20000; i++) {
+ m_pow(warmup_values);
+ }
+ // test pow perf
+ double[][] values = pow_values(1000000);
+ System.out.println("==> POW " + m_pow(values));
+
+ // force uncommon trap
+ double[][] nan_values = new double[1][2];
+ nan_values[0][0] = Double.NaN;
+ nan_values[0][1] = Double.NaN;
+ m_pow(nan_values);
+
+ // force recompilation
+ for (int i = 0; i < 20000; i++) {
+ m_pow(warmup_values);
+ }
+
+ // test pow perf again
+ System.out.println("==> POW " + m_pow(values));
+ }
+ {
+ // warmup
+ double[] warmup_values = exp_values(10);
+ m_exp(warmup_values);
+
+ for (int i = 0; i < 20000; i++) {
+ m_exp(warmup_values);
+ }
+
+ // test pow perf
+ double[] values = exp_values(1000000);
+ System.out.println("==> EXP " + m_exp(values));
+
+ // force uncommon trap
+ double[] nan_values = new double[1];
+ nan_values[0] = Double.NaN;
+ m_exp(nan_values);
+
+ // force recompilation
+ for (int i = 0; i < 20000; i++) {
+ m_exp(warmup_values);
+ }
+
+ // test pow perf again
+ System.out.println("==> EXP " + m_exp(values));
+ }
+ }
+}