[llvm] [APFloat] Add APFloat::format (PR #99088)

[Thorsten Schütt via llvm-commits]

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@@ -557,6 +559,14 @@ class IEEEFloat final : public APFloatBase {
 
   cmpResult compareAbsoluteValue(const IEEEFloat &) const;
 
+  /// returns the exponent in the format's radix
+  ExponentType getExponent() const;
+
+  /// returns the significand
+  APInt getSignificand() const;
+
+  /// decompose to an integer and exponent to radix 2
+  bool decomposeToIntegerAndPowerOf2(APInt &, int &) const;
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tschuett wrote:

Maybe it is a limitation of APFloat, but this should return `std::optional<APInt, int>`.

https://github.com/llvm/llvm-project/pull/99088