[PATCH] D133739: [RISCV][WIP] Form more VW instructions

[Quentin Colombet via Phabricator via llvm-commits]

qcolombet added a comment.

Diego (@dcaballe) and I talked offline and I am going to prototype doing the folding in one go for a whole web of extensions/users and see how bad the implementation looks.

Technically I would rather have a dedicated pass for the whole thing, but given other combines may rely on these combines to produce better code (e.g., to generate `vwmacc`) and that doing these kind of combines before ISel may prevent other optimizations (because the extended operation would be represented by an intrinsic, which is opaque to the generic combines), I don't see a whole lot of options at the moment.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D133739/new/

https://reviews.llvm.org/D133739