[all-commits] [llvm/llvm-project] a6e774: [RISCV] Improve lowering of spread(2) shuffles (#1...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a6e7749ea9e60f6b76b367d18ed90d09ea441581
      https://github.com/llvm/llvm-project/commit/a6e7749ea9e60f6b76b367d18ed90d09ea441581
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2024-12-04 (Wed, 04 Dec 2024)

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

  Log Message:
  -----------
  [RISCV] Improve lowering of spread(2) shuffles (#118658)

A spread(2) shuffle is just a interleave with an undef lane. The
existing lowering was reusing the even lane for the undef value. This
was entirely legal, but non-optimal.



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