================
@@ -127,13 +145,61 @@ ArgInfo AArch64TargetInfo::classifyArgumentType(
   }
 
   reportNYI("Aggregate argument type handling");
-  return ArgInfo::getDirect();
+  return ArgInfo::getIgnore();
 }
 
 bool AArch64TargetInfo::passAsAggregateType(const Type *Ty) const {
   // TODO: Handle SVE types. For now, they don't get through the type mapper.
   return isAggregateTypeForABI(Ty);
 }
 
+bool AArch64TargetInfo::isHomogeneousAggregateBaseType(const Type *Ty) const {
+  // Soft-float ABI: no types are homogeneous aggregates.
+  if (isSoftFloat())
+    return false;
+
+  // Homogeneous aggregates for AAPCS64 must have base types of a floating
----------------
andykaylor wrote:

Oh! That's a good catch. We're doing this wrong for the x86 ABI classification 
too. I'll put up a separate PR to deal with this general problem.

https://github.com/llvm/llvm-project/pull/218799
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