[llvm] r184713 - [APFloat] Added support for parsing float strings which contain {inf, -inf, NaN, -NaN}.

[Michael Gottesman]

Author: mgottesman
Date: Mon Jun 24 04:58:05 2013
New Revision: 184713

URL: http://llvm.org/viewvc/llvm-project?rev=184713&view=rev
Log:
[APFloat] Added support for parsing float strings which contain {inf,-inf,NaN,-NaN}.

Modified:
    llvm/trunk/include/llvm/ADT/APFloat.h
    llvm/trunk/lib/Support/APFloat.cpp

Modified: llvm/trunk/include/llvm/ADT/APFloat.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ADT/APFloat.h?rev=184713&r1=184712&r2=184713&view=diff
==============================================================================
--- llvm/trunk/include/llvm/ADT/APFloat.h (original)
+++ llvm/trunk/include/llvm/ADT/APFloat.h Mon Jun 24 04:58:05 2013
@@ -510,6 +510,7 @@ private:
   /// \name Miscellany
   /// @{
 
+  bool convertFromStringSpecials(StringRef str);
   opStatus normalize(roundingMode, lostFraction);
   opStatus addOrSubtract(const APFloat &, roundingMode, bool subtract);
   cmpResult compareAbsoluteValue(const APFloat &) const;

Modified: llvm/trunk/lib/Support/APFloat.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/APFloat.cpp?rev=184713&r1=184712&r2=184713&view=diff
==============================================================================
--- llvm/trunk/lib/Support/APFloat.cpp (original)
+++ llvm/trunk/lib/Support/APFloat.cpp Mon Jun 24 04:58:05 2013
@@ -2575,11 +2575,40 @@ APFloat::convertFromDecimalString(String
   return fs;
 }
 
+bool
+APFloat::convertFromStringSpecials(StringRef str) {
+  if (str.equals("inf") || str.equals("INFINITY")) {
+    makeInf(false);
+    return true;
+  }
+
+  if (str.equals("-inf") || str.equals("-INFINITY")) {
+    makeInf(true);
+    return true;
+  }
+
+  if (str.equals("nan") || str.equals("NaN")) {
+    makeNaN(false, false);
+    return true;
+  }
+
+  if (str.equals("-nan") || str.equals("-NaN")) {
+    makeNaN(false, true);
+    return true;
+  }
+
+  return false;
+}
+
 APFloat::opStatus
 APFloat::convertFromString(StringRef str, roundingMode rounding_mode)
 {
   assert(!str.empty() && "Invalid string length");
 
+  // Handle special cases.
+  if (convertFromStringSpecials(str))
+    return opOK;
+
   /* Handle a leading minus sign.  */
   StringRef::iterator p = str.begin();
   size_t slen = str.size();