[all-commits] [llvm/llvm-project] c55a08: [RISCV] Add shuffle coverage for compress, decompr...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c55a080c080ed76a9aabe6dcd1966fedc0ecda5a
      https://github.com/llvm/llvm-project/commit/c55a080c080ed76a9aabe6dcd1966fedc0ecda5a
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2024-11-26 (Tue, 26 Nov 2024)

  Changed paths:
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-shuffles.ll

  Log Message:
  -----------
  [RISCV] Add shuffle coverage for compress, decompress, and repeat idioms

compress is intented to match vcompress from the ISA manual. Note that
  deinterleave is a subset of this, and is already tested elsewhere.

decompress is the synthetic pattern defined in same - though we can often
  do better than the mentioned iota/vrgather.  Note that some of these
  can also be expressed as interleave with at least one undef source,
  and is already tested elsewhere.

repeat repeats each input element N times in the output.  It can be
  described as as a interleave operations, but we can sometimes do
  better lowering wise.



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