[all-commits] [llvm/llvm-project] b9b454: [RISCV][P-ext] Generalize lowerVECTOR_SHUFFLEAsRV3...

[Hongyu Chen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b9b454166eaa92d2e6e129f6c21ad59639d8364e
      https://github.com/llvm/llvm-project/commit/b9b454166eaa92d2e6e129f6c21ad59639d8364e
  Author: Hongyu Chen <xxs_chy at outlook.com>
  Date:   2026-07-20 (Mon, 20 Jul 2026)

  Changed paths:
    M cross-project-tests/intrinsic-header-tests/riscv_packed_simd.c
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvp-zip.ll

  Log Message:
  -----------
  [RISCV][P-ext] Generalize lowerVECTOR_SHUFFLEAsRV32PNarrowingShift (#210522)

The previous implementation only matches
`shuffle(extract_subvector(src), extract_subvector(src), mask)`.
This patch generalizes it to `shuffle(a, b, mask)`, so we can now lower
it to `PNSRL(concat(a,b), element_bits)` if it is a deinterleave
shuffle. And we use `foldConcatVector` to handle the original pattern
with `extract_subvector`.



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