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raw_stream formatter: [Win32] Use std::signbit() if available, instead of _fpclass(). 

FIXME: It should be generic to C++11. For now, it is dedicated to mingw-w64.
llvm-svn: 199052
This commit is contained in:
NAKAMURA Takumi 2014-01-12 14:44:46 +00:00
parent d7032ac21e
commit 79addb8d8f
1 changed files with 6 additions and 0 deletions
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6
llvm/lib/Support/raw_ostream.cpp
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@ -227,11 +227,17 @@ raw_ostream &raw_ostream::operator<<(double N) {
// On MSVCRT and compatible, output of %e is incompatible to Posix
// by default. Number of exponent digits should be at least 2. "%+03d"
// FIXME: Implement our formatter to here or Support/Format.h!
#if __cplusplus >= 201103L && defined(__MINGW32__)
// FIXME: It should be generic to C++11.
if (N == 0.0 && std::signbit(N))
return *this << "-0.000000e+00";
#else
int fpcl = _fpclass(N);
// negative zero
if (fpcl == _FPCLASS_NZ)
return *this << "-0.000000e+00";
#endif
char buf[16];
unsigned len;