/*
* 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
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package com.oracle.max.graal.snippets;
import com.oracle.max.graal.nodes.extended.*;
import com.oracle.max.graal.snippets.nodes.*;
import com.oracle.max.graal.snippets.nodes.MathIntrinsicNode.Operation;
import com.sun.cri.ci.*;
/**
* 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 RuntimeCallNode.performCall(CiRuntimeCall.ArithmeticSin, x);
}
}
public static double cos(double x) {
if (abs(x) < PI_4) {
return MathIntrinsicNode.compute(x, Operation.COS);
} else {
return RuntimeCallNode.performCall(CiRuntimeCall.ArithmeticCos, x);
}
}
public static double tan(double x) {
if (abs(x) < PI_4) {
return MathIntrinsicNode.compute(x, Operation.TAN);
} else {
return RuntimeCallNode.performCall(CiRuntimeCall.ArithmeticTan, x);
}
}
}