Mercurial > hg > graal-compiler
view graal/com.oracle.graal.snippets/src/com/oracle/graal/snippets/MathSnippetsX86.java @ 6528:436a24c36abe
fixed imprecise dependencies
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 08 Oct 2012 17:18:31 +0200 |
parents | 2a0c9f20baa1 |
children | feb579677b58 |
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/* * Copyright (c) 2011, 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 com.oracle.graal.snippets; import com.oracle.graal.api.code.RuntimeCall.Descriptor; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.Node.ConstantNodeParameter; import com.oracle.graal.graph.Node.NodeIntrinsic; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.snippets.nodes.*; import com.oracle.graal.snippets.nodes.MathIntrinsicNode.Operation; /** * Snippets for {@link java.lang.Math} methods. */ @ClassSubstitution(java.lang.Math.class) public class MathSnippetsX86 implements SnippetsInterface { private static final double PI_4 = 0.7853981633974483; public static double abs(double x) { return MathIntrinsicNode.compute(x, Operation.ABS); } public static double sqrt(double x) { return MathIntrinsicNode.compute(x, Operation.SQRT); } public static double log(double x) { return MathIntrinsicNode.compute(x, Operation.LOG); } public static double log10(double x) { return MathIntrinsicNode.compute(x, Operation.LOG10); } // NOTE on snippets below: // Math.sin(), .cos() and .tan() guarantee a value within 1 ULP of the // exact result, but x87 trigonometric FPU instructions are only that // accurate within [-pi/4, pi/4]. Examine the passed value and provide // a slow path for inputs outside of that interval. public static double sin(double x) { if (abs(x) < PI_4) { return MathIntrinsicNode.compute(x, Operation.SIN); } else { return callDouble(ARITHMETIC_SIN, x); } } public static double cos(double x) { if (abs(x) < PI_4) { return MathIntrinsicNode.compute(x, Operation.COS); } else { return callDouble(ARITHMETIC_COS, x); } } public static double tan(double x) { if (abs(x) < PI_4) { return MathIntrinsicNode.compute(x, Operation.TAN); } else { return callDouble(ARITHMETIC_TAN, x); } } public static final Descriptor ARITHMETIC_SIN = new Descriptor("arithmeticSin", Kind.Double, Kind.Double); public static final Descriptor ARITHMETIC_COS = new Descriptor("arithmeticCos", Kind.Double, Kind.Double); public static final Descriptor ARITHMETIC_TAN = new Descriptor("arithmeticTan", Kind.Double, Kind.Double); @NodeIntrinsic(value = RuntimeCallNode.class, setStampFromReturnType = true) public static native double callDouble(@ConstantNodeParameter Descriptor descriptor, double value); }