[all-commits] [llvm/llvm-project] a6b424: [RISCV] Extend redundant vrgather.vx peephole to v...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a6b424e1e7e6aa83ae49e7e12454998d3b195054
      https://github.com/llvm/llvm-project/commit/a6b424e1e7e6aa83ae49e7e12454998d3b195054
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2025-04-14 (Mon, 14 Apr 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-fp.ll

  Log Message:
  -----------
  [RISCV] Extend redundant vrgather.vx peephole to vfmv.v.f (#135503)

Extend the transform introduced in 336b290 to vfmv.v.f. This is fairly
trivial and would have been in the original commit except I hadn't
written the FP tests yet.

If the vrgather.vi is preceeded by a vfmv.v.f which writes a superset of
the lanes writen by the vrgather, and the vrgather has no passthru, then
the vrgather has no semantic effect.



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