AAAlign only handles load and store uses

[arsenm]

llvm-project/llvm/lib/Transforms/IPO/AttributorAttributes.cpp

Line 5287 in f47034c

if (auto *SI = dyn_cast<StoreInst>(U.getUser())) {

This chain of use instructions should handle AtomicRMWInst, AtomicCmpXchgInst, and MemIntrinsic at a minimum. This is of particular interest in the atomicrmw and memcpy cases