8353686: Optimize Math.cbrt for x86 64 bit platforms

test/micro/org/openjdk/bench/java/lang/CbrtPerf.java

@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2025, 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.
+ */
+package org.openjdk.bench.java.lang;
+
+import java.util.concurrent.TimeUnit;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Level;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.annotations.OperationsPerInvocation;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.RunnerException;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+import java.util.Random;
+
+public class CbrtPerf {
+
+    @Warmup(iterations = 3, time = 5, timeUnit = TimeUnit.MILLISECONDS)
+    @Measurement(iterations = 4, time = 5, timeUnit = TimeUnit.MILLISECONDS)
+    @Fork(2)
+    @BenchmarkMode(Mode.Throughput)
+    @State(Scope.Thread)
+    @OutputTimeUnit(TimeUnit.MILLISECONDS)
+    public static class CbrtPerfRanges {
+        public static int cbrtInputCount = 2048;
+
+        @Param({"0", "1"})
+        public int cbrtRangeIndex;
+
+        public double [] cbrtPosRandInputs;
+        public double [] cbrtNegRandInputs;
+        public int       cbrtInputIndex = 0;
+        public double    cbrtRangeInputs[][] = { {0.0, 0x1.0P-1022}, {0x1.0P-1022, 1.7976931348623157E308} };
+
+        @Setup
+        public void setupValues() {
+            Random random = new Random(1023);
+
+            // Fill the positive and negative cbrt vectors with random values
+            cbrtPosRandInputs = new double[cbrtInputCount];
+            cbrtNegRandInputs = new double[cbrtInputCount];
+
+            for (int i = 0; i < cbrtInputCount; i++) {
+                double cbrtLowerBound = cbrtRangeInputs[cbrtRangeIndex][0];
+                double cbrtUpperBound = cbrtRangeInputs[cbrtRangeIndex][1];
+                cbrtPosRandInputs[i] = random.nextDouble(cbrtLowerBound, cbrtUpperBound);
+                cbrtNegRandInputs[i] = random.nextDouble(-cbrtUpperBound, -cbrtLowerBound);
+            }
+        }
+
+        @Benchmark
+        @OperationsPerInvocation(2048)
+        public double  cbrtPosRangeDouble() {
+            double res = 0.0;
+            for (int i = 0; i < cbrtInputCount; i++) {
+                res += Math.cbrt(cbrtPosRandInputs[i]);
+            }
+            return res;
+        }
+
+        @Benchmark
+        @OperationsPerInvocation(2048)
+        public double  cbrtNegRangeDouble() {
+            double res = 0.0;
+            for (int i = 0; i < cbrtInputCount; i++) {
+                res += Math.cbrt(cbrtNegRandInputs[i]);
+            }
+            return res;
+        }
+    }
+
+    @Warmup(iterations = 3, time = 5, timeUnit = TimeUnit.SECONDS)
+    @Measurement(iterations = 4, time = 5, timeUnit = TimeUnit.SECONDS)
+    @Fork(2)
+    @BenchmarkMode(Mode.Throughput)
+    @State(Scope.Thread)
+    @OutputTimeUnit(TimeUnit.MILLISECONDS)
+    public static class CbrtPerfConstant {
+        public static final double constDouble0   = 0.0;
+        public static final double constDouble1   = 1.0;
+        public static final double constDouble27  = 27.0;
+        public static final double constDouble512 = 512.0;
+
+        @Benchmark
+        public double  cbrtConstDouble0() {
+            return  Math.cbrt(constDouble0);
+        }
+
+        @Benchmark
+        public double  cbrtConstDouble1() {
+            return  Math.cbrt(constDouble1);
+        }
+
+        @Benchmark
+        public double  cbrtConstDouble27() {
+            return  Math.cbrt(constDouble27);
+        }
+
+        @Benchmark
+        public double  cbrtConstDouble512() {
+            return  Math.cbrt(constDouble512);
+        }
+    }
+
+    public static void main(String[] args) throws RunnerException {
+        Options opt = new OptionsBuilder()
+                .include(CbrtPerfRanges.class.getSimpleName())
+                .build();
+
+        new Runner(opt).run();
+
+        opt = new OptionsBuilder()
+                .include(CbrtPerfConstant.class.getSimpleName())
+                .build();
+
+        new Runner(opt).run();
+    }
+}