[llvm] [APFloat] Add APFloat support for E8M0 type (PR #107127)

[Thorsten Schütt via llvm-commits]

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@@ -1091,6 +1100,26 @@ class APFloat : public APFloatBase {
     }
   }
 
+  static bool hasZero(const fltSemantics &Sem) {
+    switch (SemanticsToEnum(Sem)) {
+    default:
+      return true;
+    // The Float8E8M0FN does not have an encoding for Zeroes.
+    case APFloat::S_Float8E8M0FN:
+      return false;
+    }
+  }
+
+  static bool hasExponentOnly(const fltSemantics &Sem) {
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tschuett wrote:

doxygen comment:
/// yyy

https://github.com/llvm/llvm-project/pull/107127