799fc835f8
BUG=none R=jkummerow@chromium.org LOG=n Review URL: https://codereview.chromium.org/316133002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21693 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Extra POSIX/ANSI routines for Win32 when using Visual Studio C++. Please
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// refer to The Open Group Base Specification for specification of the correct
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// semantics for these functions.
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// (http://www.opengroup.org/onlinepubs/000095399/)
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#if defined(_MSC_VER) && (_MSC_VER < 1800)
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#include "src/base/win32-headers.h"
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#include <limits.h> // Required for INT_MAX etc.
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#include <float.h> // Required for DBL_MAX and on Win32 for finite()
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#include <cmath>
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#include "src/win32-math.h"
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#include "src/checks.h"
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namespace std {
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// Test for a NaN (not a number) value - usually defined in math.h
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int isnan(double x) {
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return _isnan(x);
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}
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// Test for infinity - usually defined in math.h
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int isinf(double x) {
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return (_fpclass(x) & (_FPCLASS_PINF | _FPCLASS_NINF)) != 0;
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}
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// Test for finite value - usually defined in math.h
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int isfinite(double x) {
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return _finite(x);
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}
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// Test if x is less than y and both nominal - usually defined in math.h
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int isless(double x, double y) {
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return isnan(x) || isnan(y) ? 0 : x < y;
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}
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// Test if x is greater than y and both nominal - usually defined in math.h
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int isgreater(double x, double y) {
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return isnan(x) || isnan(y) ? 0 : x > y;
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}
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// Classify floating point number - usually defined in math.h
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int fpclassify(double x) {
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// Use the MS-specific _fpclass() for classification.
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int flags = _fpclass(x);
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// Determine class. We cannot use a switch statement because
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// the _FPCLASS_ constants are defined as flags.
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if (flags & (_FPCLASS_PN | _FPCLASS_NN)) return FP_NORMAL;
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if (flags & (_FPCLASS_PZ | _FPCLASS_NZ)) return FP_ZERO;
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if (flags & (_FPCLASS_PD | _FPCLASS_ND)) return FP_SUBNORMAL;
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if (flags & (_FPCLASS_PINF | _FPCLASS_NINF)) return FP_INFINITE;
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// All cases should be covered by the code above.
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ASSERT(flags & (_FPCLASS_SNAN | _FPCLASS_QNAN));
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return FP_NAN;
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}
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// Test sign - usually defined in math.h
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int signbit(double x) {
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// We need to take care of the special case of both positive
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// and negative versions of zero.
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if (x == 0)
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return _fpclass(x) & _FPCLASS_NZ;
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else
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return x < 0;
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}
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} // namespace std
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#endif // _MSC_VER
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