CSE2410 Fall 2014 Bounce

// Copyright 2011 the V8 project authors. All rights reserved.

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

//

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above

//       copyright notice, this list of conditions and the following

//       disclaimer in the documentation and/or other materials provided

//       with the distribution.

//     * Neither the name of Google Inc. nor the names of its

//       contributors may be used to endorse or promote products derived

//       from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Extra POSIX/ANSI routines for Win32 when using Visual Studio C++. Please

// refer to The Open Group Base Specification for specification of the correct

// semantics for these functions.

// (http://www.opengroup.org/onlinepubs/000095399/)

#if defined(_MSC_VER) && (_MSC_VER < 1800)

#include "win32-headers.h"

#include <limits.h>        // Required for INT_MAX etc.

#include <float.h>         // Required for DBL_MAX and on Win32 for finite()

#include <cmath>

#include "win32-math.h"

#include "checks.h"

namespace std {

// Test for a NaN (not a number) value - usually defined in math.h

int isnan(double x) {

  return _isnan(x);

}

// Test for infinity - usually defined in math.h

int isinf(double x) {

  return (_fpclass(x) & (_FPCLASS_PINF | _FPCLASS_NINF)) != 0;

}

// Test for finite value - usually defined in math.h

int isfinite(double x) {

  return _finite(x);

}

// Test if x is less than y and both nominal - usually defined in math.h

int isless(double x, double y) {

  return isnan(x) || isnan(y) ? 0 : x < y;

}

// Test if x is greater than y and both nominal - usually defined in math.h

int isgreater(double x, double y) {

  return isnan(x) || isnan(y) ? 0 : x > y;

}

// Classify floating point number - usually defined in math.h

int fpclassify(double x) {

  // Use the MS-specific _fpclass() for classification.

  int flags = _fpclass(x);

  // Determine class. We cannot use a switch statement because

  // the _FPCLASS_ constants are defined as flags.

  if (flags & (_FPCLASS_PN | _FPCLASS_NN)) return FP_NORMAL;

  if (flags & (_FPCLASS_PZ | _FPCLASS_NZ)) return FP_ZERO;

  if (flags & (_FPCLASS_PD | _FPCLASS_ND)) return FP_SUBNORMAL;

  if (flags & (_FPCLASS_PINF | _FPCLASS_NINF)) return FP_INFINITE;

  // All cases should be covered by the code above.

  ASSERT(flags & (_FPCLASS_SNAN | _FPCLASS_QNAN));

  return FP_NAN;

}

// Test sign - usually defined in math.h

int signbit(double x) {

  // We need to take care of the special case of both positive

  // and negative versions of zero.

  if (x == 0)

    return _fpclass(x) & _FPCLASS_NZ;

  else

    return x < 0;

}

}  // namespace std

#endif  // _MSC_VER