Craig Topper 70b35ec0a8 [SelectionDAG] Add initial support for nneg flag on ISD::ZERO_EXTEND. (#70872) ...

This adds the nneg flag to SDNodeFlags and the node printing code.
SelectionDAGBuilder will add this flag to the node if the target doesn't
prefer sign extend.

A future RISC-V patch can remove the sign extend preference from
SelectionDAGBuilder.

I've also added the flag to the DAG combine that converts
ISD::SIGN_EXTEND to ISD::ZERO_EXTEND.

2023-11-03 11:15:08 -07:00

44 KiB

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