[llvm-commits] [llvm] r49243 - /llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

[Duncan Sands]

Hi Dale,

> -    DAG.setRoot(DAG.getNode(ISD::LABEL, MVT::Other, getRoot(),
> +    // Both PendingLoads and PendingExports must be flushed here;
> +    // this call might not return.
> +    (void)getRoot();
> +    DAG.setRoot(DAG.getNode(ISD::LABEL, MVT::Other, getControlRoot(),
>                              DAG.getConstant(BeginLabel, MVT::i32),
>                              DAG.getConstant(1, MVT::i32)));

can you please explain what this is doing.  What is getControlRoot()
and what's up with the (void)getRoot() call?

Thanks,

Duncan.