[all-commits] [llvm/llvm-project] 6b5257: [RISCV] Fix vmerge.vvm/vmv.v.v getting folded into...

[Luke Lau via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 6b52570dcd5d34a9b44ccd0bb2b2d4ffd661d9d7
      https://github.com/llvm/llvm-project/commit/6b52570dcd5d34a9b44ccd0bb2b2d4ffd661d9d7
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-08-02 (Fri, 02 Aug 2024)

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

  Log Message:
  -----------
  [RISCV] Fix vmerge.vvm/vmv.v.v getting folded into ops with mismatching EEW (#101152)

As noted in
https://github.com/llvm/llvm-project/pull/100367/files#r1695448771, we
currently fold in vmerge.vvms and vmv.v.vs into their ops even if the
EEW is different which leads to an incorrect transform.

This checks the op's EEW via its simple value type for now since there
doesn't seem to be any existing information about the EEW size of
instructions. We'll probably need to encode this at some point if we
want to be able to access it at the MachineInstr level in #100367



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