================
@@ -241,3 +241,33 @@ entry:
   store fp128 %1, ptr %scalar.result, align 8
   ret void
 }
+
+define fp128 @f128_direct(fp128 %num) nounwind {
----------------
koachan wrote:

I think this testcase already handles it?
The return pointer should be placed in %sp+64 by the caller (which becomes 
%fp+64 in the callee), and the callee will read from it before storing the 
actual values.

On the other hand argument pointers are passed in registers just like regular 
pointers.

https://github.com/llvm/llvm-project/pull/162226
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