[clang] [C++23] [CLANG] Adding C++23 constexpr math functions: fmin and frexp. (PR #88978)

[Zahira Ammarguellat via cfe-commits]

================
@@ -14547,6 +14547,20 @@ bool FloatExprEvaluator::VisitCallExpr(const CallExpr 
*E) {
   default:
     return false;
 
+  case Builtin::BI__builtin_frexp:
+  case Builtin::BI__builtin_frexpf:
+  case Builtin::BI__builtin_frexpl: {
+    LValue Pointer;
+    if (!EvaluateFloat(E->getArg(0), Result, Info) ||
+        !EvaluatePointer(E->getArg(1), Pointer, Info))
+      return false;
+    llvm::RoundingMode RM = getActiveRoundingMode(Info, E);
+    int FrexpExp;
+    FrexpExp = ilogb(Result);
+    FrexpExp = FrexpExp == llvm::detail::IEEEFloat::IEK_Zero ? 0 : FrexpExp + 
1;
+    Result =  scalbn(Result, -FrexpExp, RM);
----------------
zahiraam wrote:

Added function` StoreExponent`.  

https://github.com/llvm/llvm-project/pull/88978
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