xref: /aosp_15_r20/art/test/597-deopt-busy-loop/src/SimdLoop.java (revision 795d594fd825385562da6b089ea9b2033f3abf5a)
1*795d594fSAndroid Build Coastguard Worker /*
2*795d594fSAndroid Build Coastguard Worker  * Copyright (C) 2019 The Android Open Source Project
3*795d594fSAndroid Build Coastguard Worker  *
4*795d594fSAndroid Build Coastguard Worker  * Licensed under the Apache License, Version 2.0 (the "License");
5*795d594fSAndroid Build Coastguard Worker  * you may not use this file except in compliance with the License.
6*795d594fSAndroid Build Coastguard Worker  * You may obtain a copy of the License at
7*795d594fSAndroid Build Coastguard Worker  *
8*795d594fSAndroid Build Coastguard Worker  *      http://www.apache.org/licenses/LICENSE-2.0
9*795d594fSAndroid Build Coastguard Worker  *
10*795d594fSAndroid Build Coastguard Worker  * Unless required by applicable law or agreed to in writing, software
11*795d594fSAndroid Build Coastguard Worker  * distributed under the License is distributed on an "AS IS" BASIS,
12*795d594fSAndroid Build Coastguard Worker  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13*795d594fSAndroid Build Coastguard Worker  * See the License for the specific language governing permissions and
14*795d594fSAndroid Build Coastguard Worker  * limitations under the License.
15*795d594fSAndroid Build Coastguard Worker  */
16*795d594fSAndroid Build Coastguard Worker 
17*795d594fSAndroid Build Coastguard Worker // This test checks that values (e.g. induction variable) are properly set for SuspendCheck
18*795d594fSAndroid Build Coastguard Worker // environment in the SIMD loop; by causing asynchronous deoptimization in debuggable mode we
19*795d594fSAndroid Build Coastguard Worker // we observe the values.
20*795d594fSAndroid Build Coastguard Worker public class SimdLoop implements Runnable {
21*795d594fSAndroid Build Coastguard Worker     static final int numberOfThreads = 2;
22*795d594fSAndroid Build Coastguard Worker     volatile static boolean sExitFlag = false;
23*795d594fSAndroid Build Coastguard Worker     volatile static boolean sEntered = false;
24*795d594fSAndroid Build Coastguard Worker     int threadIndex;
25*795d594fSAndroid Build Coastguard Worker 
SimdLoop(int index)26*795d594fSAndroid Build Coastguard Worker     SimdLoop(int index) {
27*795d594fSAndroid Build Coastguard Worker         threadIndex = index;
28*795d594fSAndroid Build Coastguard Worker     }
29*795d594fSAndroid Build Coastguard Worker 
main()30*795d594fSAndroid Build Coastguard Worker     public static void main() throws Exception {
31*795d594fSAndroid Build Coastguard Worker         final Thread[] threads = new Thread[numberOfThreads];
32*795d594fSAndroid Build Coastguard Worker         for (int t = 0; t < threads.length; t++) {
33*795d594fSAndroid Build Coastguard Worker             threads[t] = new Thread(new SimdLoop(t));
34*795d594fSAndroid Build Coastguard Worker             threads[t].start();
35*795d594fSAndroid Build Coastguard Worker         }
36*795d594fSAndroid Build Coastguard Worker         for (Thread t : threads) {
37*795d594fSAndroid Build Coastguard Worker             t.join();
38*795d594fSAndroid Build Coastguard Worker         }
39*795d594fSAndroid Build Coastguard Worker 
40*795d594fSAndroid Build Coastguard Worker         System.out.println("Simd loop finishing");
41*795d594fSAndroid Build Coastguard Worker     }
42*795d594fSAndroid Build Coastguard Worker 
43*795d594fSAndroid Build Coastguard Worker     static final int kArraySize = 3000000;
44*795d594fSAndroid Build Coastguard Worker 
expectEqual(int value, int expected)45*795d594fSAndroid Build Coastguard Worker     public void expectEqual(int value, int expected) {
46*795d594fSAndroid Build Coastguard Worker         if (value != expected) {
47*795d594fSAndroid Build Coastguard Worker             throw new Error("Expected:  " + expected + ", found: " + value);
48*795d594fSAndroid Build Coastguard Worker         }
49*795d594fSAndroid Build Coastguard Worker     }
50*795d594fSAndroid Build Coastguard Worker 
$noinline$busyLoop()51*795d594fSAndroid Build Coastguard Worker     public void $noinline$busyLoop() {
52*795d594fSAndroid Build Coastguard Worker         Main.assertIsManaged();
53*795d594fSAndroid Build Coastguard Worker 
54*795d594fSAndroid Build Coastguard Worker         int[] array = new int[kArraySize];
55*795d594fSAndroid Build Coastguard Worker         sEntered = true;
56*795d594fSAndroid Build Coastguard Worker 
57*795d594fSAndroid Build Coastguard Worker         // On Arm64:
58*795d594fSAndroid Build Coastguard Worker         // These loops are likely to be vectorized; when deoptimizing to interpreter the induction
59*795d594fSAndroid Build Coastguard Worker         // variable i will be set to wrong value (== 0).
60*795d594fSAndroid Build Coastguard Worker         //
61*795d594fSAndroid Build Coastguard Worker         // Copy-paste instead of nested loop is here to avoid extra loop suspend check.
62*795d594fSAndroid Build Coastguard Worker         for (int i = 0; i < kArraySize; i++) {
63*795d594fSAndroid Build Coastguard Worker             array[i]++;
64*795d594fSAndroid Build Coastguard Worker         }
65*795d594fSAndroid Build Coastguard Worker         for (int i = 0; i < kArraySize; i++) {
66*795d594fSAndroid Build Coastguard Worker             array[i]++;
67*795d594fSAndroid Build Coastguard Worker         }
68*795d594fSAndroid Build Coastguard Worker         for (int i = 0; i < kArraySize; i++) {
69*795d594fSAndroid Build Coastguard Worker             array[i]++;
70*795d594fSAndroid Build Coastguard Worker         }
71*795d594fSAndroid Build Coastguard Worker         for (int i = 0; i < kArraySize; i++) {
72*795d594fSAndroid Build Coastguard Worker             array[i]++;
73*795d594fSAndroid Build Coastguard Worker         }
74*795d594fSAndroid Build Coastguard Worker 
75*795d594fSAndroid Build Coastguard Worker         // We might have managed to execute the whole loop before deoptimizeAll() happend.
76*795d594fSAndroid Build Coastguard Worker         if (sExitFlag) {
77*795d594fSAndroid Build Coastguard Worker             Main.assertIsInterpreted();
78*795d594fSAndroid Build Coastguard Worker         }
79*795d594fSAndroid Build Coastguard Worker         // Regression: the value of the induction variable might have been set to 0 when
80*795d594fSAndroid Build Coastguard Worker         // deoptimizing causing to have another array[0]++.
81*795d594fSAndroid Build Coastguard Worker         expectEqual(array[0], 4);
82*795d594fSAndroid Build Coastguard Worker     }
83*795d594fSAndroid Build Coastguard Worker 
run()84*795d594fSAndroid Build Coastguard Worker     public void run() {
85*795d594fSAndroid Build Coastguard Worker         if (threadIndex == 0) {
86*795d594fSAndroid Build Coastguard Worker             while (!sEntered) {
87*795d594fSAndroid Build Coastguard Worker               Thread.yield();
88*795d594fSAndroid Build Coastguard Worker             }
89*795d594fSAndroid Build Coastguard Worker 
90*795d594fSAndroid Build Coastguard Worker             Main.deoptimizeAll();
91*795d594fSAndroid Build Coastguard Worker             sExitFlag = true;
92*795d594fSAndroid Build Coastguard Worker         } else {
93*795d594fSAndroid Build Coastguard Worker             $noinline$busyLoop();
94*795d594fSAndroid Build Coastguard Worker         }
95*795d594fSAndroid Build Coastguard Worker     }
96*795d594fSAndroid Build Coastguard Worker }
97