[all-commits] [llvm/llvm-project] 9b7282: [RISCV] Recognize de-interleave shuffles with 2 so...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9b7282e545d5e47315e3ffb9e5e00d0fb547c8e3
      https://github.com/llvm/llvm-project/commit/9b7282e545d5e47315e3ffb9e5e00d0fb547c8e3
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2025-02-16 (Sun, 16 Feb 2025)

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

  Log Message:
  -----------
  [RISCV] Recognize de-interleave shuffles with 2 sources. (#127272)

We can use vnsrl+trunc on each source and concatenate the results
with vslideup.
    
For low LMUL it would be better to concat first, but I'm leaving
this for later.



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