================
@@ -938,6 +960,171 @@ LLVM_ABI DoubleAPFloat scalbn(const DoubleAPFloat &Arg,
int Exp,
roundingMode RM);
LLVM_ABI DoubleAPFloat frexp(const DoubleAPFloat &X, int &Exp, roundingMode);
+class HexFloat final {
+ friend class HexFloatArith;
+
+ /// Note: this must be the first data member.
+ /// The semantics that this value obeys.
+ const fltSemantics *semantics;
+
+ /// A binary fraction with an explicit integer bit.
+ APInt significand;
+
+ /// The signed unbiased exponent of the value.
+ ExponentType exponent;
+
+ /// The exponent in the low-order part of a HexFloat 128.
+ /// This is ignored during computation, but must be preserved so that a
+ /// bitcast to APInt and back is an identity operation.
+ ExponentType low_exponent;
+
+ /// What kind of floating point number this is.
+ ///
+ /// Only 2 bits are required, but VisualStudio incorrectly sign extends it.
+ /// Using the extra bit keeps it from failing under VisualStudio.
+ fltCategory category : 3;
+
+ /// Sign bit of the number.
+ unsigned int sign : 1;
+
+ /// The sign bit in the low-order part of a HexFloat 128.
+ /// This is ignored; see comment for low_exponent.
+ unsigned int low_sign : 1;
+
+ void initialize(const fltSemantics *);
+ void assign(const HexFloat &);
+ void copySignificand(const HexFloat &);
+ void freeSignificand();
+
+ opStatus convertToSignExtendedInteger(MutableArrayRef<integerPart> Input,
+ unsigned int Width, bool IsSigned,
+ roundingMode RM, bool *IsExact) const;
+
+ static bool roundAwayFromZero(int sign, const APInt &fraction,
+ roundingMode RM, lostFraction loast_fraction,
+ int truncatedBits);
+
+public:
+ HexFloat(const fltSemantics &); // Default construct to +0.0
----------------
Ariel-Burton wrote:
The default constructor initializes to positive 0.
https://github.com/llvm/llvm-project/pull/179771
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