[all-commits] [llvm/llvm-project] 10edc3: [RISCV] Try to optimize `vp.splice` to `vslide1up`...

[Ming Yan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 10edc3df99f798f29ae829af2bc9fc6103ceb403
      https://github.com/llvm/llvm-project/commit/10edc3df99f798f29ae829af2bc9fc6103ceb403
  Author: Ming Yan <ming.yan at terapines.com>
  Date:   2025-06-25 (Wed, 25 Jun 2025)

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

  Log Message:
  -----------
  [RISCV] Try to optimize `vp.splice` to `vslide1up`. (#144871)

Fold (vp.splice (insert_elt poison, scalar, 0), vec, 0, mask, 1, vl)
to (vslide1up vec, scalar, mask, vl).

Fold (vp.splice (splat_vector scalar), vec, 0, mask, 1, vl)
to (vslide1up vec, scalar, mask, vl).



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