[all-commits] [llvm/llvm-project] a0a904: [RISCV] Collect shuffle mask for the lane not by c...

[Jim Lin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a0a904e9467cfa8f980c31181caf6be402065b19
      https://github.com/llvm/llvm-project/commit/a0a904e9467cfa8f980c31181caf6be402065b19
  Author: Jim Lin <jim at andestech.com>
  Date:   2025-03-05 (Wed, 05 Mar 2025)

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

  Log Message:
  -----------
  [RISCV] Collect shuffle mask for the lane not by createSequentialMask (#129830)

If there are the shuffle mask <1, u, u, u, 2, u, u, u> with factor 4. we
should have the shuffle mask <1, 2> for lane 0 and <u, u> for lane 1,
and so on. Since we use createSequentialMask to create the shuffle mask,
the shuffle mask for lane 1 would be <u, 0>(dervied from <u, u+1>). This
leads to poor code generation.



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