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/*
* 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.
*/
public class Main {
static class ValueHolder {
static int getValue() {
return 1;
}
}
/// CHECK-START: int Main.div() licm (before)
/// CHECK-DAG: Div loop:{{B\d+}}
/// CHECK-START: int Main.div() licm (after)
/// CHECK-NOT: Div loop:{{B\d+}}
/// CHECK-START: int Main.div() licm (after)
/// CHECK-DAG: Div loop:none
public static int div() {
int result = 0;
for (int i = 0; i < 10; ++i) {
result += staticField / 42;
}
return result;
}
/// CHECK-START: int Main.innerDiv() licm (before)
/// CHECK-DAG: Div loop:{{B\d+}}
/// CHECK-START: int Main.innerDiv() licm (after)
/// CHECK-NOT: Div loop:{{B\d+}}
/// CHECK-START: int Main.innerDiv() licm (after)
/// CHECK-DAG: Div loop:none
public static int innerDiv() {
int result = 0;
for (int i = 0; i < 10; ++i) {
for (int j = 0; j < 10; ++j) {
result += staticField / 42;
}
}
return result;
}
/// CHECK-START: int Main.innerMul() licm (before)
/// CHECK-DAG: Mul loop:B4
/// CHECK-START: int Main.innerMul() licm (after)
/// CHECK-DAG: Mul loop:B2
public static int innerMul() {
int result = 0;
for (int i = 0; i < 10; ++i) {
for (int j = 0; j < 10; ++j) {
// The operation has been hoisted out of the inner loop.
// Note that we depend on the compiler's block numbering to
// check if it has been moved.
result += staticField * i;
}
}
return result;
}
/// CHECK-START: int Main.divByA(int, int) licm (before)
/// CHECK-DAG: Div loop:{{B\d+}}
/// CHECK-START: int Main.divByA(int, int) licm (after)
/// CHECK-DAG: Div loop:{{B\d+}}
public static int divByA(int a, int b) {
int result = 0;
while (b < 5) {
// a might be null, so we can't hoist the operation.
result += staticField / a;
b++;
}
return result;
}
/// CHECK-START: int Main.arrayLength(int[]) licm (before)
/// CHECK-DAG: <<NullCheck:l\d+>> NullCheck loop:{{B\d+}}
/// CHECK-DAG: ArrayLength [<<NullCheck>>] loop:{{B\d+}}
/// CHECK-START: int Main.arrayLength(int[]) licm (after)
/// CHECK-NOT: NullCheck loop:{{B\d+}}
/// CHECK-NOT: ArrayLength loop:{{B\d+}}
/// CHECK-START: int Main.arrayLength(int[]) licm (after)
/// CHECK-DAG: <<NullCheck:l\d+>> NullCheck loop:none
/// CHECK-DAG: ArrayLength [<<NullCheck>>] loop:none
public static int arrayLength(int[] array) {
int result = 0;
for (int i = 0; i < array.length; ++i) {
result += array[i];
}
return result;
}
/// CHECK-START: int Main.clinitCheck() licm (before)
/// CHECK-DAG: <<LoadClass:l\d+>> LoadClass loop:<<Loop:B\d+>>
/// CHECK-DAG: ClinitCheck [<<LoadClass>>] loop:<<Loop>>
/// CHECK-START: int Main.clinitCheck() licm (after)
/// CHECK-NOT: LoadClass loop:{{B\d+}}
/// CHECK-NOT: ClinitCheck loop:{{B\d+}}
/// CHECK-START: int Main.clinitCheck() licm (after)
/// CHECK-DAG: <<LoadClass:l\d+>> LoadClass loop:none
/// CHECK-DAG: ClinitCheck [<<LoadClass>>] loop:none
public static int clinitCheck() {
int i = 0;
int sum = 0;
do {
sum += ValueHolder.getValue();
i++;
} while (i < 10);
return sum;
}
/// CHECK-START: int Main.divAndIntrinsic(int[]) licm (before)
/// CHECK-DAG: Div loop:{{B\d+}}
/// CHECK-START: int Main.divAndIntrinsic(int[]) licm (after)
/// CHECK-NOT: Div loop:{{B\d+}}
/// CHECK-START: int Main.divAndIntrinsic(int[]) licm (after)
/// CHECK-DAG: Div loop:none
public static int divAndIntrinsic(int[] array) {
int result = 0;
for (int i = 0; i < array.length; i++) {
// An intrinsic call, unlike a general method call, cannot modify the field value.
// As a result, the invariant division on the field can be moved out of the loop.
result += (staticField / 42) + Math.abs(array[i]);
}
return result;
}
/// CHECK-START: int Main.invariantBoundIntrinsic(int) licm (before)
/// CHECK-DAG: Abs loop:{{B\d+}}
/// CHECK-START: int Main.invariantBoundIntrinsic(int) licm (after)
/// CHECK-NOT: Abs loop:{{B\d+}}
/// CHECK-START: int Main.invariantBoundIntrinsic(int) licm (after)
/// CHECK-DAG: Abs loop:none
public static int invariantBoundIntrinsic(int x) {
int result = 0;
// The intrinsic call to abs used as loop bound is invariant.
// As a result, the call itself can be moved out of the loop header.
for (int i = 0; i < Math.abs(x); i++) {
result += i;
}
return result;
}
/// CHECK-START: int Main.invariantBodyIntrinsic(int, int) licm (before)
/// CHECK-DAG: Max loop:{{B\d+}}
/// CHECK-START: int Main.invariantBodyIntrinsic(int, int) licm (after)
/// CHECK-NOT: Max loop:{{B\d+}}
/// CHECK-START: int Main.invariantBodyIntrinsic(int, int) licm (after)
/// CHECK-DAG: Max loop:none
public static int invariantBodyIntrinsic(int x, int y) {
int result = 0;
for (int i = 0; i < 10; i++) {
// The intrinsic call to max used inside the loop is invariant.
// As a result, the call itself can be moved out of the loop body.
result += Math.max(x, y);
}
return result;
}
//
// All operations up to the null check can be hoisted out of the
// loop. The null check itself sees the induction in its environment.
//
/// CHECK-START: int Main.doWhile(int) licm (before)
/// CHECK-DAG: <<Add:i\d+>> Add loop:<<Loop:B\d+>> outer_loop:none
/// CHECK-DAG: LoadClass loop:<<Loop>> outer_loop:none
/// CHECK-DAG: <<Get:l\d+>> StaticFieldGet loop:<<Loop>> outer_loop:none
/// CHECK-DAG: NullCheck [<<Get>>] env:[[<<Add>>,<<Get>>,{{i\d+}}]] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none
/// CHECK-DAG: BoundsCheck loop:<<Loop>> outer_loop:none
/// CHECK-DAG: ArrayGet loop:<<Loop>> outer_loop:none
//
/// CHECK-START: int Main.doWhile(int) licm (after)
/// CHECK-NOT: LoadClass loop:{{B\d+}}
/// CHECK-NOT: StaticFieldGet loop:{{B\d+}}
//
/// CHECK-START: int Main.doWhile(int) licm (after)
/// CHECK-DAG: LoadClass loop:none
/// CHECK-DAG: <<Get:l\d+>> StaticFieldGet loop:none
/// CHECK-DAG: <<Add:i\d+>> Add loop:<<Loop:B\d+>> outer_loop:none
/// CHECK-DAG: NullCheck [<<Get>>] env:[[<<Add>>,<<Get>>,{{i\d+}}]] loop:<<Loop>> outer_loop:none
/// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none
/// CHECK-DAG: BoundsCheck loop:<<Loop>> outer_loop:none
/// CHECK-DAG: ArrayGet loop:<<Loop>> outer_loop:none
public static int doWhile(int k) {
int i = k;
do {
i += 2;
} while (staticArray[i] == 0);
return i;
}
public static int staticField = 42;
public static int[] staticArray = null;
public static void assertEquals(int expected, int actual) {
if (expected != actual) {
throw new Error("Expected " + expected + ", got " + actual);
}
}
public static void main(String[] args) {
assertEquals(10, div());
assertEquals(100, innerDiv());
assertEquals(18900, innerMul());
assertEquals(105, divByA(2, 0));
assertEquals(12, arrayLength(new int[] { 4, 8 }));
assertEquals(10, clinitCheck());
assertEquals(21, divAndIntrinsic(new int[] { 4, -2, 8, -3 }));
assertEquals(45, invariantBoundIntrinsic(-10));
assertEquals(30, invariantBodyIntrinsic(2, 3));
staticArray = null;
try {
doWhile(0);
throw new Error("Expected NPE");
} catch (NullPointerException e) {
}
staticArray = new int[5];
staticArray[4] = 1;
assertEquals(4, doWhile(-2));
assertEquals(4, doWhile(0));
assertEquals(4, doWhile(2));
try {
doWhile(1);
throw new Error("Expected IOOBE");
} catch (IndexOutOfBoundsException e) {
}
System.out.println("passed");
}
}