[all-commits] [llvm/llvm-project] dbbfc9: [RISCV] Separate ActiveElementsAffectResult into V...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dbbfc952f0d4703b89fa238e2aba98f1229fb972
      https://github.com/llvm/llvm-project/commit/dbbfc952f0d4703b89fa238e2aba98f1229fb972
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-08-30 (Fri, 30 Aug 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
    M llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
    M llvm/lib/Target/RISCV/RISCVInstrFormats.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoV.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoXSf.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoXTHead.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoZvk.td
    M llvm/lib/Target/RISCV/RISCVVectorPeephole.cpp
    M llvm/test/CodeGen/RISCV/rvv/rvv-peephole-vmerge-vops.ll

  Log Message:
  -----------
  [RISCV] Separate ActiveElementsAffectResult into VL and Mask flags (#106517)

In #106110 we had to mark v[f]slide1down.vx as
ActiveElementsAffectResult since the elements in the body depend on VL.
However it doesn't depend on the mask, so this was overly conservative
and broke the vmerge peephole.

We can recover this by splitting up ActiveElementsAffectResult into VL
and Mask bits, so we can more accurately model v[f]slide1down.vx and
re-enable the peephole.



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