/*
* Copyright (C) 2016 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.
*/
/**
* A few tests of Math.abs for floating-point data.
*
* Note, as a "quality of implementation", rather than pure "spec compliance",
* we require that Math.abs() clears the sign bit (but changes nothing else)
* for all numbers, including NaN (signaling NaN may become quiet though).
*/
public class Main {
private final static boolean isDalvik =
System.getProperty("java.vm.name").equals("Dalvik");
private static final int SPQUIET = 1 << 22;
private static final long DPQUIET = 1L << 51;
public static boolean doThrow = false;
/// CHECK-START: float Main.$opt$noinline$absSP(float) builder (after)
/// CHECK-DAG: <<Result:f\d+>> InvokeStaticOrDirect intrinsic:MathAbsFloat
/// CHECK-DAG: Return [<<Result>>]
private static float $opt$noinline$absSP(float f) {
if (doThrow) {
throw new Error("Something to prevent inlining");
}
return Math.abs(f);
}
/// CHECK-START: double Main.$opt$noinline$absDP(double) builder (after)
/// CHECK-DAG: <<Result:d\d+>> InvokeStaticOrDirect intrinsic:MathAbsDouble
/// CHECK-DAG: Return [<<Result>>]
private static double $opt$noinline$absDP(double d) {
if (doThrow) {
throw new Error("Something to prevent inlining");
}
return Math.abs(d);
}
public static void main(String args[]) {
// A few obvious numbers.
for (float f = -100.0f; f < 0.0f; f += 0.5f) {
expectEqualsSP(-f, $opt$noinline$absSP(f));
}
for (float f = 0.0f; f <= 100.0f; f += 0.5f) {
expectEqualsSP(f, $opt$noinline$absSP(f));
}
for (float f = -1.5f; f <= -1.499f; f = Math.nextAfter(f, Float.POSITIVE_INFINITY)) {
expectEqualsSP(-f, $opt$noinline$absSP(f));
}
for (float f = 1.499f; f <= 1.5f; f = Math.nextAfter(f, Float.POSITIVE_INFINITY)) {
expectEqualsSP(f, $opt$noinline$absSP(f));
}
// Zero
expectEquals32(0, Float.floatToRawIntBits($opt$noinline$absSP(+0.0f)));
expectEquals32(0, Float.floatToRawIntBits($opt$noinline$absSP(-0.0f)));
// Inf.
expectEqualsSP(Float.POSITIVE_INFINITY, $opt$noinline$absSP(Float.NEGATIVE_INFINITY));
expectEqualsSP(Float.POSITIVE_INFINITY, $opt$noinline$absSP(Float.POSITIVE_INFINITY));
// A few NaN numbers.
int[] spnans = {
0x7f800001, // signaling
0x7fa00000,
0x7fbfffff,
0x7fc00000, // quiet
0x7fc00001,
0x7fffffff,
0xff800001, // signaling
0xffa00000,
0xffbfffff,
0xffc00000, // quiet
0xffffffff
};
for (int i = 0; i < spnans.length; i++) {
float f = Float.intBitsToFloat(spnans[i]);
expectEqualsNaN32(
spnans[i] & Integer.MAX_VALUE,
Float.floatToRawIntBits($opt$noinline$absSP(f)));
}
// A few obvious numbers.
for (double d = -100.0; d < 0.0; d += 0.5) {
expectEqualsDP(-d, $opt$noinline$absDP(d));
}
for (double d = 0.0; d <= 100.0; d += 0.5) {
expectEqualsDP(d, $opt$noinline$absDP(d));
}
for (double d = -1.5d; d <= -1.49999999999d; d = Math.nextAfter(d, Double.POSITIVE_INFINITY)) {
expectEqualsDP(-d, $opt$noinline$absDP(d));
}
for (double d = 1.49999999999d; d <= 1.5; d = Math.nextAfter(d, Double.POSITIVE_INFINITY)) {
expectEqualsDP(d, $opt$noinline$absDP(d));
}
// Zero
expectEquals64(0L, Double.doubleToRawLongBits($opt$noinline$absDP(+0.0f)));
expectEquals64(0L, Double.doubleToRawLongBits($opt$noinline$absDP(-0.0f)));
// Inf.
expectEqualsDP(Double.POSITIVE_INFINITY, $opt$noinline$absDP(Double.NEGATIVE_INFINITY));
expectEqualsDP(Double.POSITIVE_INFINITY, $opt$noinline$absDP(Double.POSITIVE_INFINITY));
// A few NaN numbers.
long[] dpnans = {
0x7ff0000000000001L,
0x7ff4000000000000L,
0x7ff8000000000000L,
0x7fffffffffffffffL,
0xfff0000000000001L,
0xfff4000000000000L,
0xfff8000000000000L,
0xffffffffffffffffL
};
for (int i = 0; i < dpnans.length; i++) {
double d = Double.longBitsToDouble(dpnans[i]);
expectEqualsNaN64(
dpnans[i] & Long.MAX_VALUE,
Double.doubleToRawLongBits($opt$noinline$absDP(d)));
}
System.out.println("passed");
}
private static void expectEquals32(int expected, int result) {
if (expected != result) {
throw new Error("Expected: 0x" + Integer.toHexString(expected)
+ ", found: 0x" + Integer.toHexString(result));
}
}
// We allow that an expected NaN result has become quiet.
private static void expectEqualsNaN32(int expected, int result) {
if (expected != result && (expected | SPQUIET) != result) {
if (!isDalvik) {
// If not on ART, relax the expected value more towards just
// "spec compliance" and allow sign bit to remain set for NaN.
if (expected == (result & Integer.MAX_VALUE)) {
return;
}
}
throw new Error("Expected: 0x" + Integer.toHexString(expected)
+ ", found: 0x" + Integer.toHexString(result));
}
}
private static void expectEquals64(long expected, long result) {
if (expected != result) {
throw new Error("Expected: 0x" + Long.toHexString(expected)
+ ", found: 0x" + Long.toHexString(result));
}
}
// We allow that an expected NaN result has become quiet.
private static void expectEqualsNaN64(long expected, long result) {
if (expected != result && (expected | DPQUIET) != result) {
if (!isDalvik) {
// If not on ART, relax the expected value more towards just
// "spec compliance" and allow sign bit to remain set for NaN.
if (expected == (result & Long.MAX_VALUE)) {
return;
}
}
throw new Error("Expected: 0x" + Long.toHexString(expected)
+ ", found: 0x" + Long.toHexString(result));
}
}
private static void expectEqualsSP(float expected, float result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
private static void expectEqualsDP(double expected, double result) {
if (expected != result) {
throw new Error("Expected: " + expected + ", found: " + result);
}
}
}