From 79addb8d8f3016ae3721a40ce21bb79c8fb255ae Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Sun, 12 Jan 2014 14:44:46 +0000
Subject: [PATCH] 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
---
llvm/lib/Support/raw_ostream.cpp | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/llvm/lib/Support/raw_ostream.cpp b/llvm/lib/Support/raw_ostream.cpp
index cb9648981a36..84f5ab592e63 100644
--- a/llvm/lib/Support/raw_ostream.cpp
+++ b/llvm/lib/Support/raw_ostream.cpp
@@ -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;