Enhance APFloat to retain bits of NaNs (fixes oggenc).

Use APFloat interfaces for more references, mostly
of ConstantFPSDNode.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41632 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/include/llvm/ADT/StringExtras.h b/include/llvm/ADT/StringExtras.h
index f0788a1b11..b56c183a79 100644
--- a/include/llvm/ADT/StringExtras.h
+++ b/include/llvm/ADT/StringExtras.h
@@ -15,6 +15,7 @@
 #define LLVM_ADT_STRINGEXTRAS_H
 
 #include "llvm/Support/DataTypes.h"
+#include "llvm/ADT/APFloat.h"
 #include <cctype>
 #include <cstdio>
 #include <string>
@@ -92,6 +93,14 @@ static inline std::string ftostr(double V) {
   return B;
 }
 
+static inline std::string ftostr(APFloat V) {
+  if (&V.getSemantics() == &APFloat::IEEEsingle)
+    return ftostr(V.convertToDouble());
+  else if (&V.getSemantics() == &APFloat::IEEEdouble)
+    return ftostr((double)V.convertToFloat());
+  return 0; // error
+}
+
 static inline std::string LowercaseString(const std::string &S) {
   std::string result(S);
   for (unsigned i = 0; i < S.length(); ++i)