Revert r60042. IndVarSimplify should check if APFloat is PPCDoubleDouble first before trying to convert it to an integer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60072 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/APFloat.cpp

@@ -117,11 +117,6 @@ namespace {
            && "Compile-time arithmetic does not support these semantics");
   }
 
-  static inline bool
-  isArithmeticOk(const llvm::fltSemantics &semantics) {
-    return semantics.arithmeticOK;
-  }
-
   /* Return the value of a decimal exponent of the form
      [+-]ddddddd.
 
@@ -1792,8 +1787,7 @@ APFloat::convertToSignExtendedInteger(integerPart *parts, unsigned int width,
   const integerPart *src;
   unsigned int dstPartsCount, truncatedBits;
 
-  if (!isArithmeticOk(*semantics))
-    return opInvalidOp;
+  assertArithmeticOK(*semantics);
 
   *isExact = false;
 

lib/Transforms/Scalar/IndVarSimplify.cpp

@@ -742,6 +742,8 @@ static bool useSIToFPInst(ConstantFP &InitV, ConstantFP &ExitV,
 static bool convertToInt(const APFloat &APF, uint64_t *intVal) {
 
   bool isExact = false;
+  if (&APF.getSemantics() == &APFloat::PPCDoubleDouble)
+    return false;
   if (APF.convertToInteger(intVal, 32, APF.isNegative(), 
                            APFloat::rmTowardZero, &isExact)
       != APFloat::opOK)