[all-commits] [llvm/llvm-project] 9e9924: [RISCV] Don't fold vmerge.vvm or vmv.v.v into vred...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9e9924cc2e0d0f03def09e02e7344d10066eb1b6
      https://github.com/llvm/llvm-project/commit/9e9924cc2e0d0f03def09e02e7344d10066eb1b6
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-07-17 (Wed, 17 Jul 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
    M llvm/lib/Target/RISCV/RISCVInstrInfo.h
    M llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
    M llvm/test/CodeGen/RISCV/rvv/combine-vmv.ll
    M llvm/test/CodeGen/RISCV/rvv/rvv-peephole-vmerge-vops.ll

  Log Message:
  -----------
  [RISCV] Don't fold vmerge.vvm or vmv.v.v into vredsum.vs if AVL changed (#99006)

When folding, we currently check if the pseudo's result is not lanewise
(e.g. vredsum.vs or viota.m) and bail if we're changing the mask.
However we also need to check for the AVL too.

This patch bails if the AVL changed for these pseudos, and also renames
the pseudo table property to be more explicit.



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