Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
HypotTransformer1 |
|
| 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.apache.commons.nabla.core.DifferentiationException; | |
21 | import org.objectweb.asm.Opcodes; | |
22 | import org.objectweb.asm.tree.InsnList; | |
23 | import org.objectweb.asm.tree.InsnNode; | |
24 | import org.objectweb.asm.tree.MethodInsnNode; | |
25 | import org.objectweb.asm.tree.VarInsnNode; | |
26 | ||
27 | /** Differentiation transformer for the hypot function invocation instructions. | |
28 | */ | |
29 | 1 | public class HypotTransformer1 implements MathInvocationTransformer { |
30 | ||
31 | /** {@inheritDoc} */ | |
32 | public InsnList getReplacementList(final String owner, final MethodDifferentiator methodDifferentiator) | |
33 | throws DifferentiationException { | |
34 | ||
35 | 1 | final int tmp1 = methodDifferentiator.getTmp(1); |
36 | 1 | final int tmp2 = methodDifferentiator.getTmp(2); |
37 | ||
38 | // generate differential code | |
39 | // ... x0, x1, y --> ... hypot(x0,y), x0*x1/hypot(x0,y) | |
40 | 1 | final InsnList list = new InsnList(); |
41 | 1 | list.add(new VarInsnNode(Opcodes.DSTORE, tmp1)); // => x0, x1 |
42 | 1 | list.add(new VarInsnNode(Opcodes.DSTORE, tmp2)); // => x0 |
43 | 1 | list.add(new InsnNode(Opcodes.DUP2)); // => x0, x0 |
44 | 1 | list.add(new VarInsnNode(Opcodes.DLOAD, tmp1)); // => x0, x0, y |
45 | 1 | list.add(new MethodInsnNode(Opcodes.INVOKESTATIC, owner, "hypot", DD_RETURN_D_DESCRIPTOR)); // => x0, hypot(x0,y) |
46 | 1 | list.add(new InsnNode(Opcodes.DUP2_X2)); // => hypot(x0,y), x0, hypot(x0,y) |
47 | 1 | list.add(new InsnNode(Opcodes.DDIV)); // => hypot(x0,y), x0/hypot(x0,y) |
48 | 1 | list.add(new VarInsnNode(Opcodes.DLOAD, tmp2)); // => hypot(x0,y), x0/hypot(x0,y), x1 |
49 | 1 | list.add(new InsnNode(Opcodes.DMUL)); // => hypot(x0,y), x0*x1/hypot(x0,y) |
50 | 1 | return list; |
51 | ||
52 | } | |
53 | ||
54 | } |