[llvm] [MachineLICM] Do not rely on hasSideEffect when handling impdefs (PR #145379)

[Sergei Barannikov via llvm-commits]

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@@ -585,6 +580,8 @@ void MachineLICMImpl::ProcessMI(MachineInstr *MI, BitVector &RUDefs,
       }
 
       RUDefs.set(Unit);
+      if (MO.isImplicit())
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s-barannikov wrote:

What makes implicit defs special here (compared to explicit defs)?


https://github.com/llvm/llvm-project/pull/145379