lib/Support/IsInf.cpp

   1 //===-- IsInf.cpp - Platform-independent wrapper around C99 isinf() -------===//
   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 isinf()
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Config/config.h"
  15
  16 #if HAVE_ISINF_IN_MATH_H
  17 # include <math.h>
  18 #elif HAVE_ISINF_IN_CMATH
  19 # include <cmath>
  20 #elif HAVE_STD_ISINF_IN_CMATH
  21 # include <cmath>
  22 using std::isinf;
  23 #elif HAVE_FINITE_IN_IEEEFP_H
  24 // A handy workaround I found at http://www.unixguide.net/sun/faq ...
  25 // apparently this has been a problem with Solaris for years.
  26 # include <ieeefp.h>
  27 static int isinf(double x) { return !finite(x) && x==x; }
  28 #elif defined(_MSC_VER)
  29 #include <float.h>
  30 #define isinf(X) (!_finite(X))
  31 #elif defined(_AIX) && defined(__GNUC__)
  32 // GCC's fixincludes seems to be removing the isinf() declaration from the
  33 // system header /usr/include/math.h
  34 # include <math.h>
  35 static int isinf(double x) { return !finite(x) && x==x; }
  36 #elif defined(__hpux)
  37 // HP-UX is "special"
  38 #include <math.h>
  39 static int isinf(double x) { return ((x) == INFINITY) || ((x) == -INFINITY); }
  40 #else
  41 # error "Don't know how to get isinf()"
  42 #endif
  43
  44 namespace llvm {
  45
  46 int IsInf(float f)  { return isinf(f); }
  47 int IsInf(double d) { return isinf(d); }
  48
  49 } // end namespace llvm;