/*
* Copyright (C) 2015 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.
*/
import java.util.Arrays;
//
// Test on array parameters with or without potential aliasing.
//
public class Main {
//
// Cross-over on parameters with potential aliasing on parameters.
// The arrays a and b may point to the same memory, which (without
// further runtime tests) prevents hoisting the seemingly invariant
// array reference.
//
/// CHECK-START: void Main.CrossOverLoop1(int[], int[]) licm (before)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
//
/// CHECK-START: void Main.CrossOverLoop1(int[], int[]) licm (after)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
private static void CrossOverLoop1(int a[], int b[]) {
b[20] = 99;
for (int i = 0; i < a.length; i++) {
a[i] = b[20] - 7;
}
}
/// CHECK-START: void Main.CrossOverLoop2(float[], float[]) licm (before)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
//
/// CHECK-START: void Main.CrossOverLoop2(float[], float[]) licm (after)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
private static void CrossOverLoop2(float a[], float b[]) {
b[20] = 99;
for (int i = 0; i < a.length; i++) {
a[i] = b[20] - 7;
}
}
/// CHECK-START: void Main.CrossOverLoop3(long[], long[]) licm (before)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
//
/// CHECK-START: void Main.CrossOverLoop3(long[], long[]) licm (after)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
private static void CrossOverLoop3(long a[], long b[]) {
b[20] = 99;
for (int i = 0; i < a.length; i++) {
a[i] = b[20] - 7;
}
}
/// CHECK-START: void Main.CrossOverLoop4(double[], double[]) licm (before)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
//
/// CHECK-START: void Main.CrossOverLoop4(double[], double[]) licm (after)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
private static void CrossOverLoop4(double a[], double b[]) {
b[20] = 99;
for (int i = 0; i < a.length; i++) {
a[i] = b[20] - 7;
}
}
//
// False cross-over on parameters. Parameters have same width (which used to
// cause a false type aliasing in an older version of the compiler), but since
// the types are different cannot be aliased. Thus, the invariant array
// reference can be hoisted.
//
/// CHECK-START: void Main.FalseCrossOverLoop1(int[], float[]) licm (before)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
//
/// CHECK-START: void Main.FalseCrossOverLoop1(int[], float[]) licm (after)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:none
/// CHECK-DAG: ArraySet loop:{{B\d+}}
private static void FalseCrossOverLoop1(int a[], float b[]) {
b[20] = -99;
for (int i = 0; i < a.length; i++) {
a[i] = (int) b[20] - 7;
}
}
/// CHECK-START: void Main.FalseCrossOverLoop2(float[], int[]) licm (before)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
//
/// CHECK-START: void Main.FalseCrossOverLoop2(float[], int[]) licm (after)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:none
/// CHECK-DAG: ArraySet loop:{{B\d+}}
private static void FalseCrossOverLoop2(float a[], int b[]) {
b[20] = -99;
for (int i = 0; i < a.length; i++) {
a[i] = b[20] - 7;
}
}
/// CHECK-START: void Main.FalseCrossOverLoop3(long[], double[]) licm (before)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
//
/// CHECK-START: void Main.FalseCrossOverLoop3(long[], double[]) licm (after)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:none
/// CHECK-DAG: ArraySet loop:{{B\d+}}
private static void FalseCrossOverLoop3(long a[], double b[]) {
b[20] = -99;
for (int i = 0; i < a.length; i++) {
a[i] = (long) b[20] - 7;
}
}
/// CHECK-START: void Main.FalseCrossOverLoop4(double[], long[]) licm (before)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:{{B\d+}}
/// CHECK-DAG: ArraySet loop:{{B\d+}}
//
/// CHECK-START: void Main.FalseCrossOverLoop4(double[], long[]) licm (after)
/// CHECK-DAG: ArraySet loop:none
/// CHECK-DAG: ArrayGet loop:none
/// CHECK-DAG: ArraySet loop:{{B\d+}}
private static void FalseCrossOverLoop4(double a[], long b[]) {
b[20] = -99;
for (int i = 0; i < a.length; i++) {
a[i] = b[20] - 7;
}
}
//
// Main driver and testers.
//
public static void main(String[] args) {
int[] aI = new int[100];
float[] aF = new float[100];
long[] aJ = new long[100];
double[] aD = new double[100];
// Type I.
CrossOverLoop1(aI, aI);
for (int i = 0; i < aI.length; i++) {
expectEquals(i <= 20 ? 92 : 85, aI[i]);
}
// Type F.
CrossOverLoop2(aF, aF);
for (int i = 0; i < aF.length; i++) {
expectEquals(i <= 20 ? 92 : 85, aF[i]);
}
// Type J.
CrossOverLoop3(aJ, aJ);
for (int i = 0; i < aJ.length; i++) {
expectEquals(i <= 20 ? 92 : 85, aJ[i]);
}
// Type D.
CrossOverLoop4(aD, aD);
for (int i = 0; i < aD.length; i++) {
expectEquals(i <= 20 ? 92 : 85, aD[i]);
}
// Type I vs F.
FalseCrossOverLoop1(aI, aF);
for (int i = 0; i < aI.length; i++) {
expectEquals(-106, aI[i]);
}
// Type F vs I.
FalseCrossOverLoop2(aF, aI);
for (int i = 0; i < aF.length; i++) {
expectEquals(-106, aF[i]);
}
// Type J vs D.
FalseCrossOverLoop3(aJ, aD);
for (int i = 0; i < aJ.length; i++) {
expectEquals(-106, aJ[i]);
}
// Type D vs J.
FalseCrossOverLoop4(aD, aJ);
for (int i = 0; i < aD.length; i++) {
expectEquals(-106, aD[i]);
}
// Real-world example where incorrect type assignment could introduce a bug.
// The library sorting algorithm is heavy on array reads and writes, and
// assigning the wrong J/D type to one of these would introduce errors.
for (int i = 0; i < aD.length; i++) {
aD[i] = aD.length - i - 1;
}
Arrays.sort(aD);
for (int i = 0; i < aD.length; i++) {
expectEquals((double) i, aD[i]);
}
System.out.println("passed");
}
private static void expectEquals(int expected, int result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
private static void expectEquals(long expected, long result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
private static void expectEquals(float expected, float result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
private static void expectEquals(double expected, double result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
}