[llvm] [LV] Add initial support for vectorizing literal struct return values (PR #109833)

[David Sherwood via llvm-commits]

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@@ -566,7 +570,7 @@ FunctionType *VFABI::createFunctionType(const VFInfo &Info,
 
   auto *RetTy = ScalarFTy->getReturnType();
   if (!RetTy->isVoidTy())
-    RetTy = VectorType::get(RetTy, VF);
+    RetTy = ToWideTy(RetTy, VF);
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david-arm wrote:

I think it's worth trying to pull out the VFABIDemangler changes (which also require `getContainedTypes`) into a separate PR. That would make it a bit easier to review the remaining vectoriser changes. I think logically they are independent changes because LoopVectorizationLegality will reject such functions anyway without this patch. There is already an existing unittests/Analysis/ReplaceWithVecLibTest.cpp unit test that you can hopefully adapt to cover the struct return cases.


https://github.com/llvm/llvm-project/pull/109833