/*
* Copyright (C) 2014 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.
*/
// Note that $opt$ is a marker for the optimizing compiler to ensure
// it does compile the method.
public class Main {
public static void assertEquals(int expected, int result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
public static void assertEquals(long expected, long result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
public static void assertEquals(float expected, float result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
public static void assertEquals(String expected, float result) {
if (!expected.equals(new Float(result).toString())) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
public static void assertEquals(double expected, double result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
public static void assertEquals(String expected, double result) {
if (!expected.equals(new Double(result).toString())) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
public static void assertIsNaN(float result) {
if (!Float.isNaN(result)) {
throw new Error("Expected NaN: " + result);
}
}
public static void assertIsNaN(double result) {
if (!Double.isNaN(result)) {
throw new Error("Expected NaN: " + result);
}
}
public static void main(String[] args) {
negInt();
$opt$InplaceNegOneInt(1);
negLong();
$opt$InplaceNegOneLong(1L);
negFloat();
negDouble();
}
private static void negInt() {
assertEquals(-1, $opt$NegInt(1));
assertEquals(1, $opt$NegInt(-1));
assertEquals(0, $opt$NegInt(0));
assertEquals(51, $opt$NegInt(-51));
assertEquals(-51, $opt$NegInt(51));
assertEquals(2147483647, $opt$NegInt(-2147483647)); // -(2^31 - 1)
assertEquals(-2147483647, $opt$NegInt(2147483647)); // 2^31 - 1
// From the Java 7 SE Edition specification:
// http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.15.4
//
// For integer values, negation is the same as subtraction from
// zero. The Java programming language uses two's-complement
// representation for integers, and the range of two's-complement
// values is not symmetric, so negation of the maximum negative
// int or long results in that same maximum negative number.
// Overflow occurs in this case, but no exception is thrown.
// For all integer values x, -x equals (~x)+1.''
assertEquals(-2147483648, $opt$NegInt(-2147483648)); // -(2^31)
}
private static void $opt$InplaceNegOneInt(int a) {
a = -a;
assertEquals(-1, a);
}
private static void negLong() {
assertEquals(-1L, $opt$NegLong(1L));
assertEquals(1L, $opt$NegLong(-1L));
assertEquals(0L, $opt$NegLong(0L));
assertEquals(51L, $opt$NegLong(-51L));
assertEquals(-51L, $opt$NegLong(51L));
assertEquals(2147483647L, $opt$NegLong(-2147483647L)); // -(2^31 - 1)
assertEquals(-2147483647L, $opt$NegLong(2147483647L)); // (2^31 - 1)
assertEquals(2147483648L, $opt$NegLong(-2147483648L)); // -(2^31)
assertEquals(-2147483648L, $opt$NegLong(2147483648L)); // 2^31
assertEquals(9223372036854775807L, $opt$NegLong(-9223372036854775807L)); // -(2^63 - 1)
assertEquals(-9223372036854775807L, $opt$NegLong(9223372036854775807L)); // 2^63 - 1
// See remark regarding the negation of the maximum negative
// (long) value in negInt().
assertEquals(-9223372036854775808L, $opt$NegLong(-9223372036854775808L)); // -(2^63)
}
private static void $opt$InplaceNegOneLong(long a) {
a = -a;
assertEquals(-1L, a);
}
private static void negFloat() {
assertEquals("-0.0", $opt$NegFloat(0F));
assertEquals("0.0", $opt$NegFloat(-0F));
assertEquals(-1F, $opt$NegFloat(1F));
assertEquals(1F, $opt$NegFloat(-1F));
assertEquals(51F, $opt$NegFloat(-51F));
assertEquals(-51F, $opt$NegFloat(51F));
assertEquals(-0.1F, $opt$NegFloat(0.1F));
assertEquals(0.1F, $opt$NegFloat(-0.1F));
assertEquals(343597.38362F, $opt$NegFloat(-343597.38362F));
assertEquals(-343597.38362F, $opt$NegFloat(343597.38362F));
assertEquals(-Float.MIN_NORMAL, $opt$NegFloat(Float.MIN_NORMAL));
assertEquals(Float.MIN_NORMAL, $opt$NegFloat(-Float.MIN_NORMAL));
assertEquals(-Float.MIN_VALUE, $opt$NegFloat(Float.MIN_VALUE));
assertEquals(Float.MIN_VALUE, $opt$NegFloat(-Float.MIN_VALUE));
assertEquals(-Float.MAX_VALUE, $opt$NegFloat(Float.MAX_VALUE));
assertEquals(Float.MAX_VALUE, $opt$NegFloat(-Float.MAX_VALUE));
assertEquals(Float.NEGATIVE_INFINITY, $opt$NegFloat(Float.POSITIVE_INFINITY));
assertEquals(Float.POSITIVE_INFINITY, $opt$NegFloat(Float.NEGATIVE_INFINITY));
assertIsNaN($opt$NegFloat(Float.NaN));
}
private static void negDouble() {
assertEquals("-0.0", $opt$NegDouble(0D));
assertEquals("0.0", $opt$NegDouble(-0D));
assertEquals(-1D, $opt$NegDouble(1D));
assertEquals(1D, $opt$NegDouble(-1D));
assertEquals(51D, $opt$NegDouble(-51D));
assertEquals(-51D, $opt$NegDouble(51D));
assertEquals(-0.1D, $opt$NegDouble(0.1D));
assertEquals(0.1D, $opt$NegDouble(-0.1D));
assertEquals(343597.38362D, $opt$NegDouble(-343597.38362D));
assertEquals(-343597.38362D, $opt$NegDouble(343597.38362D));
assertEquals(-Double.MIN_NORMAL, $opt$NegDouble(Double.MIN_NORMAL));
assertEquals(Double.MIN_NORMAL, $opt$NegDouble(-Double.MIN_NORMAL));
assertEquals(-Double.MIN_VALUE, $opt$NegDouble(Double.MIN_VALUE));
assertEquals(Double.MIN_VALUE, $opt$NegDouble(-Double.MIN_VALUE));
assertEquals(-Double.MAX_VALUE, $opt$NegDouble(Double.MAX_VALUE));
assertEquals(Double.MAX_VALUE, $opt$NegDouble(-Double.MAX_VALUE));
assertEquals(Double.NEGATIVE_INFINITY, $opt$NegDouble(Double.POSITIVE_INFINITY));
assertEquals(Double.POSITIVE_INFINITY, $opt$NegDouble(Double.NEGATIVE_INFINITY));
assertIsNaN($opt$NegDouble(Double.NaN));
}
static int $opt$NegInt(int a){
return -a;
}
static long $opt$NegLong(long a){
return -a;
}
static float $opt$NegFloat(float a){
return -a;
}
static double $opt$NegDouble(double a){
return -a;
}
}