[llvm] [AMDGPU] Add alignment attr & propagate alignment through make.buffer.rsrc inst (PR #145278)

[Shilei Tian via llvm-commits]

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@@ -1432,6 +1450,23 @@ static bool runImpl(Module &M, AnalysisGetter &AG, TargetMachine &TM,
       } else if (auto *CmpX = dyn_cast<AtomicCmpXchgInst>(&I)) {
         A.getOrCreateAAFor<AAAddressSpace>(
             IRPosition::value(*CmpX->getPointerOperand()));
+      } else if (auto *II = dyn_cast<IntrinsicInst>(&I)) {
+        if (II->getIntrinsicID() == Intrinsic::amdgcn_make_buffer_rsrc) {
+          IRPosition IRP = IRPosition::inst(*II);
+
+          Attributor::AlignmentCallbackTy ACB =
+              [](const IRPosition &IRP, const AbstractAttribute *AA,
+                 SmallVectorImpl<AA::ValueAndContext> &Values) {
+                if (auto *I = dyn_cast<Instruction>(&IRP.getAssociatedValue()))
+                  if (isAlignAndMakeBuffer(AA, I)) {
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shiltian wrote:

You don't need to check whether it is AAAign here since this CB is only for align.

https://github.com/llvm/llvm-project/pull/145278