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/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import org.testng.Assert;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.util.function.Supplier;
import java.util.random.RandomGenerator;
public abstract class AbstractCompressExpandTest {
static int testCompress(int i, int mask) {
int result = 0;
int rpos = 0;
while (mask != 0) {
if ((mask & 1) != 0) {
result |= (i & 1) << rpos;
rpos++; // conditional increment
}
i >>>= 1; // unconditional shift-out
mask >>>= 1;
}
return result;
}
static int testExpand(int i, int mask) {
int result = 0;
int rpos = 0;
while (mask != 0) {
if ((mask & 1) != 0) {
result |= (i & 1) << rpos;
i >>>= 1; // conditional shift-out
}
rpos++; // unconditional increment
mask >>>= 1;
}
return result;
}
static long testCompress(long i, long mask) {
long result = 0;
int rpos = 0;
while (mask != 0) {
if ((mask & 1) != 0) {
result |= (i & 1) << rpos++;
}
i >>>= 1;
mask >>>= 1;
}
return result;
}
static long testExpand(long i, long mask) {
long result = 0;
int rpos = 0;
while (mask != 0) {
if ((mask & 1) != 0) {
result |= (i & 1) << rpos;
i >>>= 1;
}
rpos++;
mask >>>= 1;
}
return result;
}
abstract int actualCompress(int i, int mask);
abstract int actualExpand(int i, int mask);
abstract int expectedCompress(int i, int mask);
abstract int expectedExpand(int i, int mask);
abstract long actualCompress(long i, long mask);
abstract long actualExpand(long i, long mask);
abstract long expectedCompress(long i, long mask);
abstract long expectedExpand(long i, long mask);
static int SIZE = 1024;
<T> Supplier<T> supplierWithToString(Supplier<T> s, String name) {
return new Supplier<>() {
@Override
public T get() {
return s.get();
}
@Override
public String toString() {
return name;
}
};
}
@DataProvider
Object[][] maskIntProvider() {
RandomGenerator rg = RandomGenerator.getDefault();
return new Object[][]{
{supplierWithToString(() -> rg.ints(SIZE).toArray(), "random masks")},
{supplierWithToString(this::contiguousMasksInt, "contiguous masks")}
};
}
@DataProvider
Object[][] maskLongProvider() {
RandomGenerator rg = RandomGenerator.getDefault();
return new Object[][]{
{supplierWithToString(() -> rg.longs(SIZE).toArray(), "random masks")},
{supplierWithToString(this::contiguousMasksLong, "contiguous masks")}
};
}
int[] contiguousMasksInt() {
int size = 32 * (32 + 1) / 2 + 1; // 528 + 1
int[] masks = new int[size];
int i = 0;
masks[i++] = 0;
for (int len = 1; len < 32; len++) {
for (int pos = 0; pos <= 32 - len; pos++) {
masks[i++] = ((1 << len) - 1) << pos;
}
}
masks[i++] = -1;
assert i == masks.length;
return masks;
}
long[] contiguousMasksLong() {
int size = 64 * (64 + 1) / 2 + 1; // 2080 + 1
long[] masks = new long[size];
int i = 0;
masks[i++] = 0L;
for (int len = 1; len < 64; len++) {
for (int pos = 0; pos <= 64 - len; pos++) {
masks[i++] = ((1L << len) - 1) << pos;
}
}
masks[i++] = -1L;
assert i == masks.length;
return masks;
}
@Test(dataProvider = "maskIntProvider")
public void testCompressInt(Supplier<int[]> maskProvider) {
RandomGenerator rg = RandomGenerator.getDefault();
int[] values = rg.ints(SIZE).toArray();
int[] masks = maskProvider.get();
for (int i : values) {
for (int m : masks) {
int actual = actualCompress(i, m);
int expected = expectedCompress(i, m);
if (actual != expected) {
print(i, m, actual, expected);
}
Assert.assertEquals(actual, expected);
}
}
}
@Test(dataProvider = "maskIntProvider")
public void testExpandInt(Supplier<int[]> maskProvider) {
RandomGenerator rg = RandomGenerator.getDefault();
int[] values = rg.ints(SIZE).toArray();
int[] masks = maskProvider.get();
for (int i : values) {
for (int m : masks) {
int actual = actualExpand(i, m);
int expected = expectedExpand(i, m);
if (actual != expected) {
print(i, m, actual, expected);
}
Assert.assertEquals(actual, expected);
}
}
}
@Test(dataProvider = "maskIntProvider")
public void testCompressExpandInt(Supplier<int[]> maskProvider) {
RandomGenerator rg = RandomGenerator.getDefault();
int[] values = rg.ints(SIZE).toArray();
int[] masks = maskProvider.get();
for (int i : values) {
for (int m : masks) {
{
int a = actualCompress(actualExpand(i, m), m);
Assert.assertEquals(a, normalizeCompressedValue(i, m));
int b = actualCompress(actualExpand(i, ~m), ~m);
Assert.assertEquals(b, normalizeCompressedValue(i, ~m));
}
{
int a = actualExpand(actualCompress(i, m), m);
// Clear unset mask bits
Assert.assertEquals(a, i & m);
int b = actualExpand(actualCompress(i, ~m), ~m);
Assert.assertEquals(a & b, 0);
Assert.assertEquals(a | b, i);
}
}
}
}
@Test
public void testContiguousMasksInt() {
RandomGenerator rg = RandomGenerator.getDefault();
int[] values = rg.ints(SIZE).toArray();
for (int i : values) {
assertContiguousMask(i, 0, 0L);
for (int len = 1; len < 32; len++) {
for (int pos = 0; pos <= 32 - len; pos++) {
int mask = ((1 << len) - 1) << pos;
assertContiguousMask(i, pos, mask);
}
}
assertContiguousMask(i, 0, -1L);
}
}
void assertContiguousMask(int i, int pos, int mask) {
Assert.assertEquals(actualCompress(i, mask), (i & mask) >>> pos);
Assert.assertEquals(actualExpand(i, mask), (i << pos) & mask);
}
@Test(dataProvider = "maskLongProvider")
public void testCompressLong(Supplier<long[]> maskProvider) {
RandomGenerator rg = RandomGenerator.getDefault();
long[] values = rg.longs(SIZE).toArray();
long[] masks = maskProvider.get();
for (long i : values) {
for (long m : masks) {
long actual = actualCompress(i, m);
long expected = expectedCompress(i, m);
if (actual != expected) {
print(i, m, actual, expected);
}
Assert.assertEquals(actual, expected);
}
}
}
@Test(dataProvider = "maskLongProvider")
public void testExpandLong(Supplier<long[]> maskProvider) {
RandomGenerator rg = RandomGenerator.getDefault();
long[] values = rg.longs(SIZE).toArray();
long[] masks = maskProvider.get();
for (long i : values) {
for (long m : masks) {
long actual = actualExpand(i, m);
long expected = expectedExpand(i, m);
if (actual != expected) {
print(i, m, actual, expected);
}
Assert.assertEquals(actual, expected);
}
}
}
@Test(dataProvider = "maskLongProvider")
public void testCompressExpandLong(Supplier<long[]> maskProvider) {
RandomGenerator rg = RandomGenerator.getDefault();
long[] values = rg.longs(SIZE).toArray();
long[] masks = maskProvider.get();
for (long i : values) {
for (long m : masks) {
{
long a = actualCompress(actualExpand(i, m), m);
Assert.assertEquals(a, normalizeCompressedValue(i, m));
long b = actualCompress(actualExpand(i, ~m), ~m);
Assert.assertEquals(b, normalizeCompressedValue(i, ~m));
}
{
long a = actualExpand(actualCompress(i, m), m);
// Clear unset mask bits
Assert.assertEquals(a, i & m);
long b = actualExpand(actualCompress(i, ~m), ~m);
Assert.assertEquals(a & b, 0);
Assert.assertEquals(a | b, i);
}
}
}
}
@Test
public void testContiguousMasksLong() {
RandomGenerator rg = RandomGenerator.getDefault();
long[] values = rg.longs(SIZE).toArray();
for (long i : values) {
assertContiguousMask(i, 0, 0L);
for (int len = 1; len < 64; len++) {
for (int pos = 0; pos <= 64 - len; pos++) {
long mask = ((1L << len) - 1) << pos;
assertContiguousMask(i, pos, mask);
}
}
assertContiguousMask(i, 0, -1L);
}
}
void assertContiguousMask(long i, int pos, long mask) {
Assert.assertEquals(actualCompress(i, mask), (i & mask) >>> pos);
Assert.assertEquals(actualExpand(i, mask), (i << pos) & mask);
}
static int normalizeCompressedValue(int i, int mask) {
int mbc = Integer.bitCount(mask);
if (mbc != 32) {
return i & ((1 << mbc) - 1);
} else {
return i;
}
}
static long normalizeCompressedValue(long i, long mask) {
int mbc = Long.bitCount(mask);
if (mbc != 64) {
return i & ((1L << mbc) - 1);
} else {
return i;
}
}
static void print(int i, int m, int actual, int expected) {
System.out.println(String.format("i = %s", Integer.toBinaryString(i)));
System.out.println(String.format("m = %s", Integer.toBinaryString(m)));
System.out.println(String.format("a = %s", Integer.toBinaryString(actual)));
System.out.println(String.format("e = %s", Integer.toBinaryString(expected)));
}
static void print(long i, long m, long actual, long expected) {
System.out.println(String.format("i = %s", Long.toBinaryString(i)));
System.out.println(String.format("m = %s", Long.toBinaryString(m)));
System.out.println(String.format("a = %s", Long.toBinaryString(actual)));
System.out.println(String.format("e = %s", Long.toBinaryString(expected)));
}
}
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