[all-commits] [llvm/llvm-project] 323d3a: [RISCV] Optimize undef Even vector in getWideningI...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 323d3ab2574ba9d371926bb1b5c67dbe7b2b4ec3
      https://github.com/llvm/llvm-project/commit/323d3ab2574ba9d371926bb1b5c67dbe7b2b4ec3
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-04-10 (Wed, 10 Apr 2024)

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

  Log Message:
  -----------
  [RISCV] Optimize undef Even vector in getWideningInterleave. (#88221)

We recently optimized the code when the Odd vector was undef to fix a
poison bug.

There are additional optimizations we can do if the even vector is
undef. With Zvbb, we can use a single vwsll. Without Zvbb, we can use a
vzext.vf2 and a vsll.



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