8265491: Math Signum optimization for x86

Reviewed-by: jiefu, jbhateja, neliasso

test/micro/org/openjdk/bench/vm/compiler/Signum.java

@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) Intel, 2021 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.vm.compiler;
+
+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.OperationsPerInvocation;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.infra.Blackhole;
+
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Thread)
+@Warmup(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
+@Measurement(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
+@Fork(3)
+public class Signum {
+
+    private final int ITERATIONS = 15000;
+
+    private double doubleValue = 1D;
+    private float floatValue = 1F;
+
+    private static final float[] float_values = {
+        123.4f,
+        -56.7f,
+        7e30f,
+        -0.3e30f,
+        Float.MAX_VALUE,
+        -Float.MAX_VALUE,
+        Float.MIN_VALUE,
+        -Float.MIN_VALUE,
+        0.0f,
+        -0.0f,
+        Float.POSITIVE_INFINITY,
+        Float.NEGATIVE_INFINITY,
+        Float.NaN,
+        Float.MIN_NORMAL,
+        -Float.MIN_NORMAL,
+        0x0.0002P-126f,
+        -0x0.0002P-126f
+    };
+
+    private static final double[] double_values = {
+        123.4d,
+        -56.7d,
+        7e30d,
+        -0.3e30d,
+        Double.MAX_VALUE,
+        -Double.MAX_VALUE,
+        Double.MIN_VALUE,
+        -Double.MIN_VALUE,
+        0.0d,
+        -0.0d,
+        Double.POSITIVE_INFINITY,
+        Double.NEGATIVE_INFINITY,
+        Double.NaN,
+        Double.MIN_NORMAL,
+        -Double.MIN_NORMAL,
+        0x0.00000001P-1022,
+        -0x0.00000001P-1022,
+    };
+
+    private static double Signum_Kernel(double data)
+    {
+        return Math.signum(data);
+    }
+
+    private static float Signum_Kernel(float data)
+    {
+        return Math.signum(data);
+    }
+
+    @Benchmark
+    @OperationsPerInvocation(ITERATIONS * 17)
+    public void _1_signumFloatTest(Blackhole bh) {
+        for (int i = 0; i < ITERATIONS; i++) {
+            for (float f : float_values) {
+                bh.consume(Signum_Kernel(f));
+            }
+        }
+    }
+
+    @Benchmark
+    @OperationsPerInvocation(ITERATIONS * 17)
+    public void _2_overheadFloat(Blackhole bh) {
+        for (int i = 0; i < ITERATIONS; i++) {
+            for (float f : float_values) {
+                bh.consume(f);
+            }
+        }
+    }
+
+    @Benchmark
+    @OperationsPerInvocation(ITERATIONS * 17)
+    public void _3_signumDoubleTest(Blackhole bh) {
+        for (int i = 0; i < ITERATIONS; i++) {
+            for (double d : double_values) {
+                bh.consume(Signum_Kernel(d));
+            }
+        }
+    }
+
+    @Benchmark
+    @OperationsPerInvocation(ITERATIONS * 17)
+    public void _4_overheadDouble(Blackhole bh) {
+        for (int i = 0; i < ITERATIONS; i++) {
+            for (double d : double_values) {
+                bh.consume(d);
+            }
+        }
+    }
+}