lib/Support/IsNAN.cpp

   1 //===-- IsNAN.cpp ---------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // Platform-independent wrapper around C99 isnan().
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Config/config.h"
  15
  16 #if HAVE_ISNAN_IN_MATH_H
  17 # include <math.h>
  18 #elif HAVE_ISNAN_IN_CMATH
  19 # include <cmath>
  20 #elif HAVE_STD_ISNAN_IN_CMATH
  21 # include <cmath>
  22 using std::isnan;
  23 #elif defined(_MSC_VER)
  24 #include <float.h>
  25 #define isnan _isnan
  26 #else
  27 # error "Don't know how to get isnan()"
  28 #endif
  29
  30 namespace llvm {
  31   int IsNAN(float f)  { return isnan(f); }
  32   int IsNAN(double d) { return isnan(d); }
  33 } // end namespace llvm;