[llvm-dev] Help request about ReplaceNode in ISelDAGToDAG (original) (raw)
Ben Shi via llvm-dev llvm-dev at lists.llvm.org
Sat Aug 7 09:04:25 PDT 2021
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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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