[llvm] [NFC][AArch64] ConditionOptimizer: replace hardcoded CC switch with TII hook (PR #188389)

[Hussam Alhassan via llvm-commits]

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@@ -375,20 +376,9 @@ void AArch64ConditionOptimizerImpl::updateCmpInstr(MachineInstr *CmpMI,
 // Modifies the condition code of a conditional instruction.
 void AArch64ConditionOptimizerImpl::updateCondInstr(MachineInstr *CondMI,
                                                     AArch64CC::CondCode NewCC) {
-  // Get the correct operand index for the conditional instruction
-  unsigned CondOpIdx;
-  switch (CondMI->getOpcode()) {
-  case AArch64::Bcc:
-    CondOpIdx = 0;
-    break;
-  case AArch64::CSINCWr:
-  case AArch64::CSINCXr:
-    CondOpIdx = 3;
-    break;
-  default:
-    llvm_unreachable("Unsupported conditional instruction");
-  }
-  CondMI->getOperand(CondOpIdx).setImm(NewCC);
+  int CCOpIdx = TII->findCondCodeOpIdx(*CondMI);
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hussam-alhassan wrote:

We could promote it to a static class member and update the other call sites, in which case should I also rename it to the shorter name anyways?

https://github.com/llvm/llvm-project/pull/188389