[llvm] [MachineLICM][AArch64] Hoist COPY instructions with other uses in the loop (PR #71403)

[Matt Arsenault via llvm-commits]

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@@ -1249,6 +1249,15 @@ bool MachineLICMBase::IsProfitableToHoist(MachineInstr &MI,
     return false;
   }
 
+  // If we have a COPY with other uses in the loop, hoist to allow the users to
+  // also be hoisted.
+  if (MI.isCopy() && IsLoopInvariantInst(MI, CurLoop) &&
+      MI.getOperand(0).isReg() && MI.getOperand(0).getReg().isVirtual() &&
+      MI.getOperand(1).isReg() && MI.getOperand(1).getReg().isVirtual() &&
+      any_of(MRI->use_nodbg_instructions(MI.getOperand(0).getReg()),
+             [&](MachineInstr &UseMI) { return CurLoop->contains(&UseMI); }))
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arsenm wrote:

do you just need a value capture of CurLoop?

https://github.com/llvm/llvm-project/pull/71403