1 /* 2 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.replacements.amd64; 26 27 import org.graalvm.compiler.api.replacements.ClassSubstitution; 28 import org.graalvm.compiler.api.replacements.MethodSubstitution; 29 import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor; 30 import org.graalvm.compiler.graph.Node.ConstantNodeParameter; 31 import org.graalvm.compiler.graph.Node.NodeIntrinsic; 32 import org.graalvm.compiler.nodes.extended.ForeignCallNode; 33 import org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode; 34 import org.graalvm.compiler.replacements.nodes.UnaryMathIntrinsicNode.UnaryOperation; 35 36 // JaCoCo Exclude 37 38 /** 39 * Substitutions for some {@link java.lang.Math} methods that leverage AMD64 instructions for 40 * selected input values. 41 */ 42 @ClassSubstitution(Math.class) 43 public class AMD64MathSubstitutions { 44 45 private static final double PI_4 = Math.PI / 4; 46 47 // NOTE on snippets below: 48 // Math.sin(), .cos() and .tan() guarantee a value within 1 ULP of the 49 // exact result, but x87 trigonometric FPU instructions are only that 50 // accurate within [-pi/4, pi/4]. Examine the passed value and provide 51 // a slow path for inputs outside of that interval. 52 53 @MethodSubstitution 54 public static double sin(double x) { 55 if (Math.abs(x) < PI_4) { 56 return UnaryMathIntrinsicNode.compute(x, UnaryOperation.SIN); 57 } else { 58 return callDouble1(UnaryOperation.SIN.foreignCallDescriptor, x); 59 } 60 } 61 62 @MethodSubstitution 63 public static double cos(double x) { 64 if (Math.abs(x) < PI_4) { 65 return UnaryMathIntrinsicNode.compute(x, UnaryOperation.COS); 66 } else { 67 return callDouble1(UnaryOperation.COS.foreignCallDescriptor, x); 68 } 69 } 70 71 @MethodSubstitution 72 public static double tan(double x) { 73 if (Math.abs(x) < PI_4) { 74 return UnaryMathIntrinsicNode.compute(x, UnaryOperation.TAN); 75 } else { 76 return callDouble1(UnaryOperation.TAN.foreignCallDescriptor, x); 77 } 78 } 79 80 @NodeIntrinsic(value = ForeignCallNode.class) 81 private static native double callDouble1(@ConstantNodeParameter ForeignCallDescriptor descriptor, double value); 82 83 @NodeIntrinsic(value = ForeignCallNode.class) 84 private static native double callDouble2(@ConstantNodeParameter ForeignCallDescriptor descriptor, double a, double b); 85 }