================
@@ -446,10 +448,11 @@ ABIArgInfo SystemZABIInfo::classifyArgumentType(QualType 
Ty) const {
 
     // The structure is passed as an unextended integer, a float, or a double.
     if (isFPArgumentType(SingleElementTy)) {
-      assert(Size == 32 || Size == 64);
+      assert(Size == 16 || Size == 32 || Size == 64);
       return ABIArgInfo::getDirect(
-          Size == 32 ? llvm::Type::getFloatTy(getVMContext())
-                     : llvm::Type::getDoubleTy(getVMContext()));
+          Size == 16   ? llvm::Type::getHalfTy(getVMContext())
----------------
JonPsson1 wrote:

ok - patch updated to do this mapping in a direct way. It was actually more 
beneficial perhaps than merely guarding against bfloat, as the Size can reflect 
an overalignment in which case the (for historical reasons I beleive) type 
actually changes to match the alignment.

https://github.com/llvm/llvm-project/pull/109164
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