[llvm] [AMDGPU] Enable volatile and non-temporal for loads to LDS (PR #153244)

[Robert Imschweiler via llvm-commits]

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@@ -937,6 +951,43 @@ std::optional<SIMemOpInfo> SIMemOpAccess::getAtomicCmpxchgOrRmwInfo(
   return constructFromMIWithMMO(MI);
 }
 
+std::optional<std::tuple<SIMemOpInfo, SIMemOp>>
+SIMemOpAccess::getLdsLoadStoreInfo(
+    const MachineBasicBlock::iterator &MI) const {
+  assert(MI->getDesc().TSFlags & SIInstrFlags::maybeAtomic);
+
+  if (!(MI->mayLoad() && MI->mayStore()))
+    return std::nullopt;
+
+  // An LDS DMA will have exactly two memory operands.
+  if (MI->getNumMemOperands() != 2)
+    return std::nullopt;
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ro-i wrote:

ig isLDSDMA()? https://github.com/llvm/llvm-project/blob/c50ed05cada308dea282e026cc782a9ea3ab0c29/llvm/lib/Target/AMDGPU/SIInstrInfo.h#L594

https://github.com/llvm/llvm-project/pull/153244