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