[llvm-dev] Help request about ReplaceNode in ISelDAGToDAG

[Ben Shi via llvm-dev]

Hello,


I would like to make some DAG transform in RISCV's ISelDAGToDAG, but I find the ReplaceNode() requests


the new Node to be a MachineNode( usually created be curDAG->getMachineNode with the opcode set to RISCV::xxxx).


Can I just pass it a SDNode (with opcode set to anoher ISD::xxx, not RISCV::xxx) ? It seems LLVM will crash.


Because I want to change the opcode to ADD, can I avoid the complexity of selecting ADDW/ADDI/ADDIW for a machine node in different cases?


Ben Shi

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