Remove the assumption that FP's are either float or

double from some of the many places in the optimizers
it appears, and do something reasonable with x86
long double.
Make APInt::dump() public, remove newline, use it to
dump ConstantSDNode's.
Allow APFloats in FoldingSet.
Expand X86 backend handling of long doubles (conversions
to/from int, mostly).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41967 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Constants.h

@@ -231,6 +231,9 @@ public:
   /// considers -0.0 to be null as well as 0.0.  :(
   virtual bool isNullValue() const;
 
+  // Get a negative zero.
+  static ConstantFP *getNegativeZero(const Type* Ty);
+
   /// isExactlyValue - We don't rely on operator== working on double values, as
   /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
   /// As such, this method can be used to do an exact bit-for-bit comparison of