Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
AtanTransformer |
|
| 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 atan function invocation instructions. | |
26 | */ | |
27 | 1 | public class AtanTransformer implements MathInvocationTransformer { |
28 | ||
29 | /** {@inheritDoc} */ | |
30 | public InsnList getReplacementList(final String owner, final MethodDifferentiator methodDifferentiator) { | |
31 | ||
32 | // generate differential code | |
33 | // ... u0, u1 --> ... atan(u0), u1 / (1 + u0 * u0) | |
34 | 3 | final InsnList list = new InsnList(); |
35 | 3 | list.add(new InsnNode(Opcodes.DUP2_X2)); |
36 | 3 | list.add(new InsnNode(Opcodes.POP2)); |
37 | 3 | list.add(new InsnNode(Opcodes.DUP2_X2)); |
38 | 3 | list.add(new InsnNode(Opcodes.DUP2)); |
39 | 3 | list.add(new InsnNode(Opcodes.DMUL)); |
40 | 3 | list.add(new InsnNode(Opcodes.DCONST_1)); |
41 | 3 | list.add(new InsnNode(Opcodes.DADD)); |
42 | 3 | list.add(new InsnNode(Opcodes.DDIV)); |
43 | 3 | list.add(new InsnNode(Opcodes.DUP2_X2)); |
44 | 3 | list.add(new InsnNode(Opcodes.POP2)); |
45 | 3 | list.add(new MethodInsnNode(Opcodes.INVOKESTATIC, owner, "atan", D_RETURN_D_DESCRIPTOR)); |
46 | 3 | list.add(new InsnNode(Opcodes.DUP2_X2)); |
47 | 3 | list.add(new InsnNode(Opcodes.POP2)); |
48 | 3 | return list; |
49 | ||
50 | } | |
51 | } |