[all-commits] [llvm/llvm-project] 53710b: [RISCV] Use vslidedown for undef sub-sequences in ...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 53710b43a0546c329a7523055987981a4fc7973b
      https://github.com/llvm/llvm-project/commit/53710b43a0546c329a7523055987981a4fc7973b
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2023-05-03 (Wed, 03 May 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-i2fp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-load.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-store.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vselect.ll
    M llvm/test/CodeGen/RISCV/srem-seteq-illegal-types.ll
    M llvm/test/CodeGen/RISCV/urem-seteq-illegal-types.ll

  Log Message:
  -----------
  [RISCV] Use vslidedown for undef sub-sequences in generic build_vector

This is a follow up to D149263 which extends the generic vslide1down handling to use vslidedown (without the one) for undef elements, and in particular for undef sub-sequences. This both removes the domain crossing, and for undef subsequences results in fewer instructions over all.

Differential Revision: https://reviews.llvm.org/D149658#inline-1446673