[all-commits] [llvm/llvm-project] 23b6a0: [CG][RISCV]Fix shuffling of odd number of input ve...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 23b6a05ec9c2220844748487612761d1e09166b7
      https://github.com/llvm/llvm-project/commit/23b6a05ec9c2220844748487612761d1e09166b7
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2025-02-05 (Wed, 05 Feb 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-exact-vlen.ll

  Log Message:
  -----------
  [CG][RISCV]Fix shuffling of odd number of input vectors

If the input contains odd number of shuffled vectors, the 2 last
shuffles are shuffled with the same first vector. Need to correctly
process such situation: when the first vector is requested for the first
time - extract it from the source vector, when it is requested the
second time - reuse previous result. The second vector should be
extracted in both cases.

Fixes #125269

Reviewers: topperc, preames

Reviewed By: preames

Pull Request: https://github.com/llvm/llvm-project/pull/125693



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