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+// Copyright 2006-2008 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.
+
+#ifndef V8_CONVERSIONS_INL_H_
+#define V8_CONVERSIONS_INL_H_
+
+#include <math.h>
+#include <float.h>         // required for DBL_MAX and on Win32 for finite()
+#include <stdarg.h>
+
+// ----------------------------------------------------------------------------
+// Extra POSIX/ANSI functions for Win32/MSVC.
+
+#include "conversions.h"
+#include "platform.h"
+
+namespace v8 { namespace internal {
+
+// The fast double-to-int conversion routine does not guarantee
+// rounding towards zero.
+static inline int FastD2I(double x) {
+#ifdef __USE_ISOC99
+  // The ISO C99 standard defines the lrint() function which rounds a
+  // double to an integer according to the current rounding direction.
+  return lrint(x);
+#else
+  // This is incredibly slow on Intel x86. The reason is that rounding
+  // towards zero is implied by the C standard. This means that the
+  // status register of the FPU has to be changed with the 'fldcw'
+  // instruction. This completely stalls the pipeline and takes many
+  // hundreds of clock cycles.
+  return static_cast<int>(x);
+#endif
+}
+
+
+static inline double DoubleToInteger(double x) {
+  if (isnan(x)) return 0;
+  if (!isfinite(x) || x == 0) return x;
+  return (x >= 0) ? floor(x) : ceil(x);
+}
+
+
+int32_t NumberToInt32(Object* number) {
+  if (number->IsSmi()) return Smi::cast(number)->value();
+  return DoubleToInt32(number->Number());
+}
+
+
+uint32_t NumberToUint32(Object* number) {
+  if (number->IsSmi()) return Smi::cast(number)->value();
+  return DoubleToUint32(number->Number());
+}
+
+
+int32_t DoubleToInt32(double x) {
+  int32_t i = FastD2I(x);
+  if (FastI2D(i) == x) return i;
+  static const double two32 = 4294967296.0;
+  static const double two31 = 2147483648.0;
+  if (!isfinite(x) || x == 0) return 0;
+  if (x < 0 || x >= two32) x = fmod(x, two32);
+  x = (x >= 0) ? floor(x) : ceil(x) + two32;
+  return (int32_t) ((x >= two31) ? x - two32 : x);
+}
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_CONVERSIONS_INL_H_