[clang] [llvm] [APFloat] Add APFloat support for FP6 data types (PR #94735)

[Jakub Kuderski via cfe-commits]

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@@ -1499,16 +1521,18 @@ static void tcSetLeastSignificantBits(APInt::WordType *dst, unsigned parts,
 /* Handle overflow.  Sign is preserved.  We either become infinity or
    the largest finite number.  */
 IEEEFloat::opStatus IEEEFloat::handleOverflow(roundingMode rounding_mode) {
-  /* Infinity?  */
-  if (rounding_mode == rmNearestTiesToEven ||
-      rounding_mode == rmNearestTiesToAway ||
-      (rounding_mode == rmTowardPositive && !sign) ||
-      (rounding_mode == rmTowardNegative && sign)) {
-    if (semantics->nonFiniteBehavior == fltNonfiniteBehavior::NanOnly)
-      makeNaN(false, sign);
-    else
-      category = fcInfinity;
-    return (opStatus) (opOverflow | opInexact);
+  if (semantics->nonFiniteBehavior != fltNonfiniteBehavior::NoNanInf) {
+    /* Infinity?  */
+    if (rounding_mode == rmNearestTiesToEven ||
+        rounding_mode == rmNearestTiesToAway ||
+        (rounding_mode == rmTowardPositive && !sign) ||
+        (rounding_mode == rmTowardNegative && sign)) {
+      if (semantics->nonFiniteBehavior == fltNonfiniteBehavior::NanOnly)
+        makeNaN(false, sign);
+      else
+        category = fcInfinity;
+      return (opStatus)(opOverflow | opInexact);
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kuhar wrote:

nit: prefer `static_cast`

https://github.com/llvm/llvm-project/pull/94735