[llvm] [GlobalISel][AArch64] Add libcall lowering for fpowi. (PR #67114)

[Amara Emerson via llvm-commits]

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@@ -851,6 +853,24 @@ LegalizerHelper::libcall(MachineInstr &MI, LostDebugLocObserver &LocObserver) {
       return Status;
     break;
   }
+  case TargetOpcode::G_FPOWI: {
+    Type *HLTy = getFloatTypeForLLT(Ctx, LLTy);
+    Type *ITy = IntegerType::get(
+        Ctx, MRI.getType(MI.getOperand(2).getReg()).getSizeInBits());
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aemerson wrote:

You can `cast<GenericMachineInstr>(MI)` and then use `getReg(N)` for brevity here and below as well.

https://github.com/llvm/llvm-project/pull/67114