1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 public class Main {
main(String[] args)18   public static void main(String[] args) {
19     if (new Main().$opt$TestFloatPhi() != 33.0f) {
20       throw new Error("Unexpected result");
21     }
22   }
23 
$opt$TestFloatPhi()24   public float $opt$TestFloatPhi() {
25     float a = floatField;
26     float b = 42.0f;
27     if (test1) {
28       // The phi for `a` will be found to be of type float.
29       a = otherFloatField;
30       // The phi for `b` will be found to be of type int (constants in DEX).
31       b = 33.0f;
32     }
33     // Use a different condition to avoid having dx being too clever.
34     if (test2) {
35       // Type propagation now realizes that `b` must be of type float. So
36       // it requests a float equivalent for `b`. Because the phi for `a` is
37       // next to the phi for `b` in the phi list, the compiler used to crash,
38       // assuming that a float phi following a phi *must* be for the same DEX
39       // register.
40       a = b;
41     }
42     return a;
43   }
44 
45   float floatField = 4.2f;
46   float otherFloatField = 42.2f;
47   boolean test1 = true;
48   boolean test2 = true;
49 }
50