[PATCH] D94736: [RISCV] Change zext.w to be an alias of add.uw rd, rs1, x0 instead of packw.

[Craig Topper via Phabricator via llvm-commits]

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This didn't make it into the published 0.93 spec, but it was the
intention.

But it is in the tex source as of this commit
https://github.com/riscv/riscv-bitmanip/commit/d172f029c074d47026a0c0d0f12d8b475c86a472

This means zext.w now requires Zba. Not sure if we should still use
packw if Zbp is enabled and Zba isn't. I'll leave that for the future
when packw is closer to being final.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94736

Files:
  llvm/lib/Target/RISCV/RISCV.td
  llvm/lib/Target/RISCV/RISCVInstrInfo.td
  llvm/lib/Target/RISCV/RISCVInstrInfoB.td
  llvm/test/CodeGen/RISCV/rv64Zba.ll
  llvm/test/CodeGen/RISCV/rv64Zbbp.ll
  llvm/test/MC/RISCV/rv64b-aliases-valid.s

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