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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.
+ */
+
+//
+// Test on loop optimizations.
+//
+public class Main {
+
+ static int sResult;
+
+ //
+ // Various sequence variables where bound checks can be removed from loop.
+ //
+
+ /// CHECK-START: int Main.linear(int[]) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linear(int[]) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int linear(int[] x) {
+ int result = 0;
+ for (int i = 0; i < x.length; i++) {
+ result += x[i];
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.linearDown(int[]) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linearDown(int[]) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int linearDown(int[] x) {
+ int result = 0;
+ for (int i = x.length - 1; i >= 0; i--) {
+ result += x[i];
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.linearObscure(int[]) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linearObscure(int[]) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int linearObscure(int[] x) {
+ int result = 0;
+ for (int i = x.length - 1; i >= 0; i--) {
+ int k = i + 5;
+ result += x[k - 5];
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.linearWhile(int[]) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linearWhile(int[]) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int linearWhile(int[] x) {
+ int i = 0;
+ int result = 0;
+ while (i < x.length) {
+ result += x[i++];
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.wrapAroundThenLinear(int[]) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.wrapAroundThenLinear(int[]) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int wrapAroundThenLinear(int[] x) {
+ // Loop with wrap around (length - 1, 0, 1, 2, ..).
+ int w = x.length - 1;
+ int result = 0;
+ for (int i = 0; i < x.length; i++) {
+ result += x[w];
+ w = i;
+ }
+ return result;
+ }
+
+ /// CHECK-START: int[] Main.linearWithParameter(int) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int[] Main.linearWithParameter(int) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int[] linearWithParameter(int n) {
+ int[] x = new int[n];
+ for (int i = 0; i < n; i++) {
+ x[i] = i;
+ }
+ return x;
+ }
+
+ /// CHECK-START: int Main.linearWithCompoundStride() BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linearWithCompoundStride() BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int linearWithCompoundStride() {
+ int[] x = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 };
+ int result = 0;
+ for (int i = 0; i <= 12; ) {
+ i++;
+ result += x[i];
+ i++;
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.linearWithLargePositiveStride() BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linearWithLargePositiveStride() BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int linearWithLargePositiveStride() {
+ int[] x = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+ int result = 0;
+ int k = 0;
+ // Range analysis has no problem with a trip-count defined by a
+ // reasonably large positive stride.
+ for (int i = 1; i <= 10 * 10000000 + 1; i += 10000000) {
+ result += x[k++];
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.linearWithVeryLargePositiveStride() BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linearWithVeryLargePositiveStride() BCE (after)
+ /// CHECK-DAG: BoundsCheck
+ private static int linearWithVeryLargePositiveStride() {
+ int[] x = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+ int result = 0;
+ int k = 0;
+ // Range analysis conservatively bails due to potential of wrap-around
+ // arithmetic while computing the trip-count for this very large stride.
+ for (int i = 1; i < 2147483647; i += 195225786) {
+ result += x[k++];
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.linearWithLargeNegativeStride() BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linearWithLargeNegativeStride() BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int linearWithLargeNegativeStride() {
+ int[] x = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+ int result = 0;
+ int k = 0;
+ // Range analysis has no problem with a trip-count defined by a
+ // reasonably large negative stride.
+ for (int i = -1; i >= -10 * 10000000 - 1; i -= 10000000) {
+ result += x[k++];
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.linearWithVeryLargeNegativeStride() BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.linearWithVeryLargeNegativeStride() BCE (after)
+ /// CHECK-DAG: BoundsCheck
+ private static int linearWithVeryLargeNegativeStride() {
+ int[] x = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+ int result = 0;
+ int k = 0;
+ // Range analysis conservatively bails due to potential of wrap-around
+ // arithmetic while computing the trip-count for this very large stride.
+ for (int i = -2; i > -2147483648; i -= 195225786) {
+ result += x[k++];
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.periodicIdiom(int) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.periodicIdiom(int) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int periodicIdiom(int tc) {
+ int[] x = { 1, 3 };
+ // Loop with periodic sequence (0, 1).
+ int k = 0;
+ int result = 0;
+ for (int i = 0; i < tc; i++) {
+ result += x[k];
+ k = 1 - k;
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.periodicSequence2(int) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.periodicSequence2(int) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int periodicSequence2(int tc) {
+ int[] x = { 1, 3 };
+ // Loop with periodic sequence (0, 1).
+ int k = 0;
+ int l = 1;
+ int result = 0;
+ for (int i = 0; i < tc; i++) {
+ result += x[k];
+ int t = l;
+ l = k;
+ k = t;
+ }
+ return result;
+ }
+
+ /// CHECK-START: int Main.periodicSequence4(int) BCE (before)
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-DAG: BoundsCheck
+ /// CHECK-START: int Main.periodicSequence4(int) BCE (after)
+ /// CHECK-NOT: BoundsCheck
+ private static int periodicSequence4(int tc) {
+ int[] x = { 1, 3, 5, 7 };
+ // Loop with periodic sequence (0, 1, 2, 3).
+ int k = 0;
+ int l = 1;
+ int m = 2;
+ int n = 3;
+ int result = 0;
+ for (int i = 0; i < tc; i++) {
+ result += x[k] + x[l] + x[m] + x[n]; // all used at once
+ int t = n;
+ n = k;
+ k = l;
+ l = m;
+ m = t;
+ }
+ return result;
+ }
+
+ //
+ // Cases that actually go out of bounds. These test cases
+ // ensure the exceptions are thrown at the right places.
+ //
+
+ private static void lowerOOB(int[] x) {
+ for (int i = -1; i < x.length; i++) {
+ sResult += x[i];
+ }
+ }
+
+ private static void upperOOB(int[] x) {
+ for (int i = 0; i <= x.length; i++) {
+ sResult += x[i];
+ }
+ }
+
+ //
+ // Verifier.
+ //
+
+ public static void main(String[] args) {
+ int[] empty = { };
+ int[] x = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
+
+ // Linear and wrap-around.
+ expectEquals(0, linear(empty));
+ expectEquals(55, linear(x));
+ expectEquals(0, linearDown(empty));
+ expectEquals(55, linearDown(x));
+ expectEquals(0, linearObscure(empty));
+ expectEquals(55, linearObscure(x));
+ expectEquals(0, linearWhile(empty));
+ expectEquals(55, linearWhile(x));
+ expectEquals(0, wrapAroundThenLinear(empty));
+ expectEquals(55, wrapAroundThenLinear(x));
+
+ // Linear with parameter.
+ sResult = 0;
+ try {
+ linearWithParameter(-1);
+ } catch (NegativeArraySizeException e) {
+ sResult = 1;
+ }
+ expectEquals(1, sResult);
+ for (int n = 0; n < 32; n++) {
+ int[] r = linearWithParameter(n);
+ expectEquals(n, r.length);
+ for (int i = 0; i < n; i++) {
+ expectEquals(i, r[i]);
+ }
+ }
+
+ // Linear with non-unit strides.
+ expectEquals(56, linearWithCompoundStride());
+ expectEquals(66, linearWithLargePositiveStride());
+ expectEquals(66, linearWithVeryLargePositiveStride());
+ expectEquals(66, linearWithLargeNegativeStride());
+ expectEquals(66, linearWithVeryLargeNegativeStride());
+
+ // Periodic adds (1, 3), one at the time.
+ expectEquals(0, periodicIdiom(-1));
+ for (int tc = 0; tc < 32; tc++) {
+ int expected = (tc >> 1) << 2;
+ if ((tc & 1) != 0)
+ expected += 1;
+ expectEquals(expected, periodicIdiom(tc));
+ }
+
+ // Periodic adds (1, 3), one at the time.
+ expectEquals(0, periodicSequence2(-1));
+ for (int tc = 0; tc < 32; tc++) {
+ int expected = (tc >> 1) << 2;
+ if ((tc & 1) != 0)
+ expected += 1;
+ expectEquals(expected, periodicSequence2(tc));
+ }
+
+ // Periodic adds (1, 3, 5, 7), all at once.
+ expectEquals(0, periodicSequence4(-1));
+ for (int tc = 0; tc < 32; tc++) {
+ expectEquals(tc * 16, periodicSequence4(tc));
+ }
+
+ // Lower bound goes OOB.
+ sResult = 0;
+ try {
+ lowerOOB(x);
+ } catch (ArrayIndexOutOfBoundsException e) {
+ sResult += 1000;
+ }
+ expectEquals(1000, sResult);
+
+ // Upper bound goes OOB.
+ sResult = 0;
+ try {
+ upperOOB(x);
+ } catch (ArrayIndexOutOfBoundsException e) {
+ sResult += 1000;
+ }
+ expectEquals(1055, sResult);
+
+ }
+
+ private static void expectEquals(int expected, int result) {
+ if (expected != result) {
+ throw new Error("Expected: " + expected + ", found: " + result);
+ }
+ }
+}
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