[llvm] [AMDGPU] Extended vector promotion to aggregate types. (PR #143784)

[Shilei Tian via llvm-commits]

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@@ -818,6 +818,28 @@ static BasicBlock::iterator skipToNonAllocaInsertPt(BasicBlock &BB,
   return I;
 }
 
+/// Get the underlying type of a homogeneous aggregate type, or nullptr if the
+/// type is non-homogeneous.
+static Type *getHomogeneousType(Type *Ty) {
+  if (auto *VectorTy = dyn_cast<FixedVectorType>(Ty))
+    return VectorTy->getElementType();
+  if (auto *ArrayTy = dyn_cast<ArrayType>(Ty))
+    return getHomogeneousType(ArrayTy->getElementType());
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shiltian wrote:

use a work list instead of recursion pls

https://github.com/llvm/llvm-project/pull/143784