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/*
* Copyright (C) 2024 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
public class Main {
// Numbers have to be inlined for the bug to trigger: we cannot define this as a generic method
// that takes e.g. 12 as a parameter. We can define some methods to test different cases. Each
// method is the same as doing:
// result = initial_value;
// for (int i = start; i < end; ++i) { result += i * 10; }
// return result;
// As long as `end` is 5 or less
private static int $noinline$nestedLoopCalculation_0_2_12() {
int result = 12;
for (int outer = 0; outer < 2; ++outer) {
int first_inner;
for (first_inner = 5; first_inner > outer; first_inner--) {}
for (int second_inner = 0; second_inner < 10; second_inner++) {
result += first_inner;
}
}
return result;
}
private static int $noinline$nestedLoopCalculation_1_3_12() {
int result = 12;
for (int outer = 1; outer < 3; ++outer) {
int first_inner;
for (first_inner = 5; first_inner > outer; first_inner--) {}
for (int second_inner = 0; second_inner < 10; second_inner++) {
result += first_inner;
}
}
return result;
}
private static int $noinline$nestedLoopCalculation_minus2_2_12() {
int result = 12;
for (int outer = -2; outer < 2; ++outer) {
int first_inner;
for (first_inner = 5; first_inner > outer; first_inner--) {}
for (int second_inner = 0; second_inner < 10; second_inner++) {
result += first_inner;
}
}
return result;
}
private static int $noinline$nestedLoopCalculation_0_5_12() {
int result = 12;
for (int outer = 0; outer < 5; ++outer) {
int first_inner;
for (first_inner = 5; first_inner > outer; first_inner--) {}
for (int second_inner = 0; second_inner < 10; second_inner++) {
result += first_inner;
}
}
return result;
}
public static void main(String[] f) {
// 12 + 0 + 10 = 22
assertIntEquals(22, $noinline$nestedLoopCalculation_0_2_12());
// 12 + 10 + 20 = 42
assertIntEquals(42, $noinline$nestedLoopCalculation_1_3_12());
// 12 + (-20) + (-10) + 0 + 10 = -8
assertIntEquals(-8, $noinline$nestedLoopCalculation_minus2_2_12());
// 12 + 0 + 10 + 20 + 30 + 40 = 112
assertIntEquals(112, $noinline$nestedLoopCalculation_0_5_12());
}
public static void assertIntEquals(int expected, int result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
}
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