Wrapper for c99 isnan()

llvm-svn: 14338

1 files changed, 31 insertions, 0 deletions

diff --git a/llvm/lib/Support/IsNAN.cpp b/llvm/lib/Support/IsNAN.cpp
new file mode 100644
index 00000000000..ade6bf1dc86
--- /dev/null
+++ b/llvm/lib/Support/IsNAN.cpp
@@ -0,0 +1,31 @@
+//===-- IsNAN.cpp ---------------------------------------------------------===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// Platform-independent wrapper around C99 isnan(). 
+//
+//===----------------------------------------------------------------------===//
+
+#include "Config/config.h"
+#if HAVE_ISNAN_IN_MATH_H
+# include <math.h>
+#elif HAVE_ISNAN_IN_CMATH
+# include <cmath>
+#elif HAVE_STD_ISNAN_IN_CMATH
+# include <cmath>
+using std::isnan;
+#else
+# error "Don't know how to get isnan()"
+#endif
+
+namespace llvm {
+
+int IsNAN (float f)  { return isnan (f); }
+int IsNAN (double d) { return isnan (d); }
+
+}; // end namespace llvm;