Index: llvm/trunk/lib/AsmParser/LLLexer.cpp
===================================================================
--- llvm/trunk/lib/AsmParser/LLLexer.cpp
+++ llvm/trunk/lib/AsmParser/LLLexer.cpp
@@ -958,7 +958,8 @@
     }
   }
 
-  APFloatVal = APFloat(std::atof(TokStart));
+  APFloatVal = APFloat(APFloat::IEEEdouble,
+                       StringRef(TokStart, CurPtr - TokStart));
   return lltok::APFloat;
 }
 
@@ -994,6 +995,7 @@
     }
   }
 
-  APFloatVal = APFloat(std::atof(TokStart));
+  APFloatVal = APFloat(APFloat::IEEEdouble,
+                       StringRef(TokStart, CurPtr - TokStart));
   return lltok::APFloat;
 }