[all-commits] [llvm/llvm-project] 619efd: [RISCV] Fix v[f]slide1down.vx having VL changed (#...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 619efd75da77415e016c79c37a0fabe573ce1845
      https://github.com/llvm/llvm-project/commit/619efd75da77415e016c79c37a0fabe573ce1845
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-08-29 (Thu, 29 Aug 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrInfoV.td
    A llvm/test/CodeGen/RISCV/rvv/pr106109.ll
    M llvm/test/CodeGen/RISCV/rvv/rvv-peephole-vmerge-vops.ll

  Log Message:
  -----------
  [RISCV] Fix v[f]slide1down.vx having VL changed (#106110)

v[f]slide1down.vx uses VL to determine where the element is inserted
into, so changing the VL changes the result.

This fixes this by setting ActiveElementsAffectsResult, but it's overly
conservative. We should relax this later by modelling that it's ok to
change the mask, just not VL.

Fixes #106109



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