/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/FloatingPoint.h"

#include <math.h>

using mozilla::DoublesAreIdentical;
using mozilla::NegativeInfinity;
using mozilla::PositiveInfinity;
using mozilla::SpecificNaN;
using mozilla::UnspecifiedNaN;

static void
ShouldBeIdentical(double d1, double d2)
{
  MOZ_ASSERT(DoublesAreIdentical(d1, d2));
  MOZ_ASSERT(DoublesAreIdentical(d2, d1));
}

static void
ShouldNotBeIdentical(double d1, double d2)
{
  MOZ_ASSERT(!DoublesAreIdentical(d1, d2));
  MOZ_ASSERT(!DoublesAreIdentical(d2, d1));
}

static void
TestDoublesAreIdentical()
{
  ShouldBeIdentical(+0.0, +0.0);
  ShouldBeIdentical(-0.0, -0.0);
  ShouldNotBeIdentical(+0.0, -0.0);

  ShouldBeIdentical(1.0, 1.0);
  ShouldNotBeIdentical(-1.0, 1.0);
  ShouldBeIdentical(4294967295.0, 4294967295.0);
  ShouldNotBeIdentical(-4294967295.0, 4294967295.0);
  ShouldBeIdentical(4294967296.0, 4294967296.0);
  ShouldBeIdentical(4294967297.0, 4294967297.0);
  ShouldBeIdentical(1e300, 1e300);

  ShouldBeIdentical(PositiveInfinity(), PositiveInfinity());
  ShouldBeIdentical(NegativeInfinity(), NegativeInfinity());
  ShouldNotBeIdentical(PositiveInfinity(), NegativeInfinity());

  ShouldNotBeIdentical(-0.0, NegativeInfinity());
  ShouldNotBeIdentical(+0.0, NegativeInfinity());
  ShouldNotBeIdentical(1e300, NegativeInfinity());
  ShouldNotBeIdentical(3.141592654, NegativeInfinity());

  ShouldBeIdentical(UnspecifiedNaN(), UnspecifiedNaN());
  ShouldBeIdentical(-UnspecifiedNaN(), UnspecifiedNaN());
  ShouldBeIdentical(UnspecifiedNaN(), -UnspecifiedNaN());

  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 42));
  ShouldBeIdentical(SpecificNaN(1, 17), SpecificNaN(1, 42));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(1, 42));
  ShouldBeIdentical(SpecificNaN(1, 17), SpecificNaN(0, 42));

  const uint64_t Mask = 0xfffffffffffffULL;
  for (unsigned i = 0; i < 52; i++) {
    for (unsigned j = 0; j < 52; j++) {
      for (unsigned sign = 0; i < 2; i++) {
        ShouldBeIdentical(SpecificNaN(0, 1ULL << i), SpecificNaN(sign, 1ULL << j));
        ShouldBeIdentical(SpecificNaN(1, 1ULL << i), SpecificNaN(sign, 1ULL << j));

        ShouldBeIdentical(SpecificNaN(0, Mask & ~(1ULL << i)),
                          SpecificNaN(sign, Mask & ~(1ULL << j)));
        ShouldBeIdentical(SpecificNaN(1, Mask & ~(1ULL << i)),
                          SpecificNaN(sign, Mask & ~(1ULL << j)));
      }
    }
  }
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x8000000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x4000000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x2000000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x1000000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x0800000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x0400000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x0200000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x0100000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x0080000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x0040000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x0020000000000ULL));
  ShouldBeIdentical(SpecificNaN(0, 17), SpecificNaN(0, 0x0010000000000ULL));
  ShouldBeIdentical(SpecificNaN(1, 17), SpecificNaN(0, 0xff0ffffffffffULL));
  ShouldBeIdentical(SpecificNaN(1, 17), SpecificNaN(0, 0xfffffffffff0fULL));

  ShouldNotBeIdentical(UnspecifiedNaN(), +0.0);
  ShouldNotBeIdentical(UnspecifiedNaN(), -0.0);
  ShouldNotBeIdentical(UnspecifiedNaN(), 1.0);
  ShouldNotBeIdentical(UnspecifiedNaN(), -1.0);
  ShouldNotBeIdentical(UnspecifiedNaN(), PositiveInfinity());
  ShouldNotBeIdentical(UnspecifiedNaN(), NegativeInfinity());
}

int
main()
{
  TestDoublesAreIdentical();
}