[PATCH] D150665: [RISCV] Handle addimm chains in SelectAddrRegImm

Wed May 17 23:06:39 PDT 2023

craig.topper added a comment.

In D150665#4351914 <https://reviews.llvm.org/D150665#4351914>, @dtcxzyw wrote:

> In D150665#4350578 <https://reviews.llvm.org/D150665#4350578>, @craig.topper wrote:
>
>> I feel like this should be handled where the chain was formed or in DAG combine. The whole reason the chain exists is to provide a common base. If the common base isn't right we should fix that.
>
> I cannot find code about forming chains in `RISCVISelLowering.cpp` and `RISCVISelDAGToDAG.cpp`. Should I implement some virtual member functions of class `TargetLowering`?

I think the splitting is done by CodeGenPrepare::splitLargeGEPOffsets()

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https://reviews.llvm.org/D150665