Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
AcoshTransformer |
|
| 1.0;1 |
1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | package org.apache.commons.nabla.automatic.functions; | |
18 | ||
19 | import org.apache.commons.nabla.automatic.analysis.MethodDifferentiator; | |
20 | import org.objectweb.asm.Opcodes; | |
21 | import org.objectweb.asm.tree.InsnList; | |
22 | import org.objectweb.asm.tree.InsnNode; | |
23 | import org.objectweb.asm.tree.MethodInsnNode; | |
24 | ||
25 | /** Differentiation transformer for the acosh function invocation instructions. | |
26 | * <p>As of java 6, the JVM does not supply an inverse hyperbolic | |
27 | * cosine function (see <a | |
28 | * href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4919337">bug | |
29 | * 4919337</a>), so this generator will not be triggered for java 6 and below.</p> | |
30 | */ | |
31 | 1 | public class AcoshTransformer implements MathInvocationTransformer { |
32 | ||
33 | /** {@inheritDoc} */ | |
34 | public InsnList getReplacementList(final String owner, final MethodDifferentiator methodDifferentiator) { | |
35 | ||
36 | // generate differential code | |
37 | // ... u0, u1 --> ... acosh(u0), u1 / sqrt(u0 * u0 - 1) | |
38 | 1 | final InsnList list = new InsnList(); |
39 | 1 | list.add(new InsnNode(Opcodes.DUP2_X2)); |
40 | 1 | list.add(new InsnNode(Opcodes.POP2)); |
41 | 1 | list.add(new InsnNode(Opcodes.DUP2_X2)); |
42 | 1 | list.add(new InsnNode(Opcodes.DUP2)); |
43 | 1 | list.add(new InsnNode(Opcodes.DMUL)); |
44 | 1 | list.add(new InsnNode(Opcodes.DCONST_1)); |
45 | 1 | list.add(new InsnNode(Opcodes.DSUB)); |
46 | 1 | list.add(new MethodInsnNode(Opcodes.INVOKESTATIC, owner, "sqrt", D_RETURN_D_DESCRIPTOR)); |
47 | 1 | list.add(new InsnNode(Opcodes.DDIV)); |
48 | 1 | list.add(new InsnNode(Opcodes.DUP2_X2)); |
49 | 1 | list.add(new InsnNode(Opcodes.POP2)); |
50 | 1 | list.add(new MethodInsnNode(Opcodes.INVOKESTATIC, owner, "acosh", D_RETURN_D_DESCRIPTOR)); |
51 | 1 | list.add(new InsnNode(Opcodes.DUP2_X2)); |
52 | 1 | list.add(new InsnNode(Opcodes.POP2)); |
53 | 1 | return list; |
54 | ||
55 | } | |
56 | } |