================
@@ -5086,6 +5089,67 @@ bool SROA::presplitLoadsAndStores(AllocaInst &AI,
AllocaSlices &AS) {
return true;
}
+/// Try to canonicalize a homogeneous struct partition to a vector type.
+///
+/// We can do this if all the elements of the struct are the same and tightly
+/// packed. This can sometimes eliminate allocas because structs cannot get
+/// promoted to LLVM values, but vectors can.
+///
+/// We only apply this transformation when all users of the alloca are memory
+/// intrinsics. Otherwise, if there is a load or store of some other type to
the
+/// partition, SROA would select that type.
+///
+/// Applying this transformation too early may hinder memcpyopt, which may
+/// generate better code when eliminating allocas. For example, see
----------------
arsenm wrote:
This seems like a solvable problem in memcpyopt?
https://github.com/llvm/llvm-project/pull/165159
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