[all-commits] [llvm/llvm-project] 2af263: [RISCV] Use vcompress in deinterleave2 intrinsic l...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2af2634c64b1c6f34c4905b24863b930effe3b9c
      https://github.com/llvm/llvm-project/commit/2af2634c64b1c6f34c4905b24863b930effe3b9c
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2024-12-02 (Mon, 02 Dec 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/vector-deinterleave-load.ll
    M llvm/test/CodeGen/RISCV/rvv/vector-deinterleave.ll

  Log Message:
  -----------
  [RISCV] Use vcompress in deinterleave2 intrinsic lowering (#118325)

This is analogous to febbf91 which added shuffle lowering using
vcompress; we can do the same thing in the deinterleave2 lowering path
which is used for scalable vectors.

Note that we can further improve this for high lmul usage by adjusting
how we materialize the mask (whose result is at most m1 with a known bit
pattern). I am deliberately staging the work so that the changes to
reduce register pressure are more easily evaluated on their own merit.



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