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cmath: Restore definitions of std::fpclassify #42

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cmath: Restore definitions of std::fpclassify #42

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41 changes: 41 additions & 0 deletions include/cmath
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Original file line number Diff line number Diff line change
Expand Up @@ -611,8 +611,49 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#undef islessgreater
#undef isunordered

#if !defined(FP_NAN)
#define FP_NAN 0
#endif
#if !defined(FP_INFINITE)
#define FP_INFINITE 1
#endif
#if !defined(FP_ZERO)
#define FP_ZERO 2
#endif
#if !defined(FP_SUBNORMAL)
#define FP_SUBNORMAL 3
#endif
#if !defined(FP_NORMAL)
#define FP_NORMAL 4
#endif

#if __cplusplus >= 201103L

#ifndef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
constexpr int
fpclassify(float __x)
{ return __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL,
FP_SUBNORMAL, FP_ZERO, __x); }

constexpr int
fpclassify(double __x)
{ return __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL,
FP_SUBNORMAL, FP_ZERO, __x); }

constexpr int
fpclassify(long double __x)
{ return __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL,
FP_SUBNORMAL, FP_ZERO, __x); }
#endif

#ifndef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
template<typename _Tp>
constexpr typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value,
int>::__type
fpclassify(_Tp __x)
{ return __x != 0 ? FP_NORMAL : FP_ZERO; }
#endif

#ifndef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
constexpr bool
isfinite(float __x)
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