[llvm] [AMDGPU] Do not commute DPP instructions with a non-identity dpp_ctrl (PR #218393)

[Arseniy Obolenskiy via llvm-commits]

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@@ -2898,11 +2898,21 @@ bool SIInstrInfo::isLegalToSwap(const MachineInstr &MI, unsigned OpIdx0,
   return isImmOperandLegal(MI, OpIdx1, MO0);
 }
 
+bool SIInstrInfo::isCommutableDPP(const MachineInstr &MI) const {
+  if (!isDPP(MI))
+    return true;
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aobolensk wrote:

Done

https://github.com/llvm/llvm-project/pull/218393