content: /*
   * 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 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) intrinsics_recognition (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) intrinsics_recognition (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,
        0x7fa00000,
        0x7fc00000,
        0x7fffffff,
        0xff800001,
        0xffa00000,
        0xffc00000,
        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) {
        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) {
        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);
      }
    }
  }
  