/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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public class Main {
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static class Dummy {
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static int getValue() {
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return 1;
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}
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}
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/// CHECK-START: int Main.div() licm (before)
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/// CHECK-DAG: Div loop:{{B\d+}}
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/// CHECK-START: int Main.div() licm (after)
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/// CHECK-NOT: Div loop:{{B\d+}}
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/// CHECK-START: int Main.div() licm (after)
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/// CHECK-DAG: Div loop:none
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public static int div() {
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int result = 0;
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for (int i = 0; i < 10; ++i) {
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result += staticField / 42;
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}
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return result;
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}
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/// CHECK-START: int Main.innerDiv() licm (before)
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/// CHECK-DAG: Div loop:{{B\d+}}
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/// CHECK-START: int Main.innerDiv() licm (after)
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/// CHECK-NOT: Div loop:{{B\d+}}
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/// CHECK-START: int Main.innerDiv() licm (after)
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/// CHECK-DAG: Div loop:none
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public static int innerDiv() {
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int result = 0;
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for (int i = 0; i < 10; ++i) {
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for (int j = 0; j < 10; ++j) {
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result += staticField / 42;
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}
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}
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return result;
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}
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/// CHECK-START: int Main.innerMul() licm (before)
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/// CHECK-DAG: Mul loop:B4
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/// CHECK-START: int Main.innerMul() licm (after)
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/// CHECK-DAG: Mul loop:B2
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public static int innerMul() {
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int result = 0;
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for (int i = 0; i < 10; ++i) {
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for (int j = 0; j < 10; ++j) {
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// The operation has been hoisted out of the inner loop.
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// Note that we depend on the compiler's block numbering to
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// check if it has been moved.
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result += staticField * i;
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}
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}
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return result;
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}
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/// CHECK-START: int Main.divByA(int, int) licm (before)
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/// CHECK-DAG: Div loop:{{B\d+}}
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/// CHECK-START: int Main.divByA(int, int) licm (after)
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/// CHECK-DAG: Div loop:{{B\d+}}
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public static int divByA(int a, int b) {
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int result = 0;
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while (b < 5) {
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// a might be null, so we can't hoist the operation.
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result += staticField / a;
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b++;
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}
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return result;
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}
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/// CHECK-START: int Main.arrayLength(int[]) licm (before)
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/// CHECK-DAG: <<NullCheck:l\d+>> NullCheck loop:{{B\d+}}
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/// CHECK-DAG: ArrayLength [<<NullCheck>>] loop:{{B\d+}}
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/// CHECK-START: int Main.arrayLength(int[]) licm (after)
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/// CHECK-NOT: NullCheck loop:{{B\d+}}
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/// CHECK-NOT: ArrayLength loop:{{B\d+}}
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/// CHECK-START: int Main.arrayLength(int[]) licm (after)
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/// CHECK-DAG: <<NullCheck:l\d+>> NullCheck loop:none
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/// CHECK-DAG: ArrayLength [<<NullCheck>>] loop:none
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public static int arrayLength(int[] array) {
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int result = 0;
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for (int i = 0; i < array.length; ++i) {
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result += array[i];
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}
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return result;
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}
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/// CHECK-START: int Main.clinitCheck() licm (before)
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/// CHECK-DAG: <<LoadClass:l\d+>> LoadClass loop:<<Loop:B\d+>>
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/// CHECK-DAG: ClinitCheck [<<LoadClass>>] loop:<<Loop>>
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/// CHECK-START: int Main.clinitCheck() licm (after)
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/// CHECK-NOT: LoadClass loop:{{B\d+}}
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/// CHECK-NOT: ClinitCheck loop:{{B\d+}}
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/// CHECK-START: int Main.clinitCheck() licm (after)
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/// CHECK-DAG: <<LoadClass:l\d+>> LoadClass loop:none
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/// CHECK-DAG: ClinitCheck [<<LoadClass>>] loop:none
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public static int clinitCheck() {
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int i = 0;
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int sum = 0;
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do {
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sum += Dummy.getValue();
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i++;
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} while (i < 10);
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return sum;
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}
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/// CHECK-START: int Main.divAndIntrinsic(int[]) licm (before)
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/// CHECK-DAG: Div loop:{{B\d+}}
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/// CHECK-START: int Main.divAndIntrinsic(int[]) licm (after)
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/// CHECK-NOT: Div loop:{{B\d+}}
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/// CHECK-START: int Main.divAndIntrinsic(int[]) licm (after)
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/// CHECK-DAG: Div loop:none
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public static int divAndIntrinsic(int[] array) {
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int result = 0;
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for (int i = 0; i < array.length; i++) {
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// An intrinsic call, unlike a general method call, cannot modify the field value.
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// As a result, the invariant division on the field can be moved out of the loop.
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result += (staticField / 42) + Math.abs(array[i]);
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}
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return result;
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}
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/// CHECK-START: int Main.invariantBoundIntrinsic(int) instruction_simplifier (before)
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/// CHECK-DAG: InvokeStaticOrDirect loop:{{B\d+}}
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//
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/// CHECK-START: int Main.invariantBoundIntrinsic(int) licm (before)
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/// CHECK-DAG: Abs loop:{{B\d+}}
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/// CHECK-START: int Main.invariantBoundIntrinsic(int) licm (after)
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/// CHECK-NOT: Abs loop:{{B\d+}}
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/// CHECK-START: int Main.invariantBoundIntrinsic(int) licm (after)
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/// CHECK-DAG: Abs loop:none
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public static int invariantBoundIntrinsic(int x) {
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int result = 0;
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// The intrinsic call to abs used as loop bound is invariant.
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// As a result, the call itself can be moved out of the loop header.
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for (int i = 0; i < Math.abs(x); i++) {
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result += i;
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}
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return result;
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}
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/// CHECK-START: int Main.invariantBodyIntrinsic(int, int) instruction_simplifier (before)
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/// CHECK-DAG: InvokeStaticOrDirect loop:{{B\d+}}
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/// CHECK-START: int Main.invariantBodyIntrinsic(int, int) licm (before)
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/// CHECK-DAG: Max loop:{{B\d+}}
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/// CHECK-START: int Main.invariantBodyIntrinsic(int, int) licm (after)
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/// CHECK-NOT: Max loop:{{B\d+}}
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/// CHECK-START: int Main.invariantBodyIntrinsic(int, int) licm (after)
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/// CHECK-DAG: Max loop:none
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public static int invariantBodyIntrinsic(int x, int y) {
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int result = 0;
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for (int i = 0; i < 10; i++) {
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// The intrinsic call to max used inside the loop is invariant.
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// As a result, the call itself can be moved out of the loop body.
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result += Math.max(x, y);
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}
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return result;
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}
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//
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// All operations up to the null check can be hoisted out of the
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// loop. The null check itself sees the induction in its environment.
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//
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/// CHECK-START: int Main.doWhile(int) licm (before)
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/// CHECK-DAG: <<Add:i\d+>> Add loop:<<Loop:B\d+>> outer_loop:none
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/// CHECK-DAG: LoadClass loop:<<Loop>> outer_loop:none
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/// CHECK-DAG: <<Get:l\d+>> StaticFieldGet loop:<<Loop>> outer_loop:none
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/// CHECK-DAG: NullCheck [<<Get>>] env:[[<<Add>>,<<Get>>,{{i\d+}}]] loop:<<Loop>> outer_loop:none
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/// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none
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/// CHECK-DAG: BoundsCheck loop:<<Loop>> outer_loop:none
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/// CHECK-DAG: ArrayGet loop:<<Loop>> outer_loop:none
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//
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/// CHECK-START: int Main.doWhile(int) licm (after)
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/// CHECK-NOT: LoadClass loop:{{B\d+}}
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/// CHECK-NOT: StaticFieldGet loop:{{B\d+}}
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//
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/// CHECK-START: int Main.doWhile(int) licm (after)
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/// CHECK-DAG: LoadClass loop:none
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/// CHECK-DAG: <<Get:l\d+>> StaticFieldGet loop:none
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/// CHECK-DAG: <<Add:i\d+>> Add loop:<<Loop:B\d+>> outer_loop:none
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/// CHECK-DAG: NullCheck [<<Get>>] env:[[<<Add>>,<<Get>>,{{i\d+}}]] loop:<<Loop>> outer_loop:none
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/// CHECK-DAG: ArrayLength loop:<<Loop>> outer_loop:none
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/// CHECK-DAG: BoundsCheck loop:<<Loop>> outer_loop:none
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/// CHECK-DAG: ArrayGet loop:<<Loop>> outer_loop:none
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public static int doWhile(int k) {
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int i = k;
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do {
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i += 2;
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} while (staticArray[i] == 0);
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return i;
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}
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public static int staticField = 42;
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public static int[] staticArray = null;
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public static void assertEquals(int expected, int actual) {
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if (expected != actual) {
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throw new Error("Expected " + expected + ", got " + actual);
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}
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}
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public static void main(String[] args) {
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assertEquals(10, div());
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assertEquals(100, innerDiv());
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assertEquals(18900, innerMul());
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assertEquals(105, divByA(2, 0));
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assertEquals(12, arrayLength(new int[] { 4, 8 }));
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assertEquals(10, clinitCheck());
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assertEquals(21, divAndIntrinsic(new int[] { 4, -2, 8, -3 }));
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assertEquals(45, invariantBoundIntrinsic(-10));
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assertEquals(30, invariantBodyIntrinsic(2, 3));
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staticArray = null;
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try {
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doWhile(0);
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throw new Error("Expected NPE");
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} catch (NullPointerException e) {
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}
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staticArray = new int[5];
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staticArray[4] = 1;
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assertEquals(4, doWhile(-2));
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assertEquals(4, doWhile(0));
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assertEquals(4, doWhile(2));
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try {
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doWhile(1);
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throw new Error("Expected IOOBE");
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} catch (IndexOutOfBoundsException e) {
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}
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System.out.println("passed");
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}
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}
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