[llvm] [AMDGPU] Downgrade cluster loads in strict mode (PR #218999)

[Stanislav Mekhanoshin via llvm-commits]

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@@ -11792,12 +11792,30 @@ SITargetLowering::lowerStructBufferAtomicIntrin(SDValue Op, SelectionDAG &DAG,
                                  M->getMemOperand());
 }
 
+static void InitializeM0ToZero(SDValue Op, SelectionDAG &DAG, SDLoc DL) {
+  auto *N = Op.getNode();
+  SDValue Zero = DAG.getConstant(0, DL, MVT::i32);
+  unsigned NumOperands = N->getNumOperands();
+  if (N->getOperand(NumOperands - 1) == Zero)
+    return;
+  SmallVector<SDValue, 7> Ops(N->ops());
+  Ops[NumOperands - 1] = Zero; // M0 = 0
+  (void)DAG.UpdateNodeOperands(N, Ops);
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rampitec wrote:

Done

https://github.com/llvm/llvm-project/pull/218999