[all-commits] [llvm/llvm-project] 8c22bb: [RISCV][P-ext] Replace lowerBuildVectorAsRV32PNarr...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8c22bbde747ce8c577318c3fb6cafaae6f1b8aec
      https://github.com/llvm/llvm-project/commit/8c22bbde747ce8c577318c3fb6cafaae6f1b8aec
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp

  Log Message:
  -----------
  [RISCV][P-ext] Replace lowerBuildVectorAsRV32PNarrowingShift with shuffle lowering. (#209088)

Add an implementation of isExtractSubvectorCheap for extracting
v2i16/v4i8 from a v4i16/v8i8 vector on RV32. This allows the
build_vector+extract_elt pattern to be turned into
shuffle_vector+extract_subvectors.

Assisted-by: Claude



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