[all-commits] [llvm/llvm-project] d7853b: [ARM] Generate VDUP(Const) from constant buildvectors

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d7853bae941006cece63013f09d524e72bbbec45
      https://github.com/llvm/llvm-project/commit/d7853bae941006cece63013f09d524e72bbbec45
  Author: David Green <david.green at arm.com>
  Date:   2021-06-08 (Tue, 08 Jun 2021)

  Changed paths:
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/predicated-liveout-unknown-lanes.ll
    M llvm/test/CodeGen/Thumb2/mve-fp16convertloops.ll
    M llvm/test/CodeGen/Thumb2/mve-gather-scatter-tailpred.ll
    M llvm/test/CodeGen/Thumb2/mve-pred-vctpvpsel.ll
    M llvm/test/CodeGen/Thumb2/mve-shifts.ll
    M llvm/test/CodeGen/Thumb2/mve-vmovimm.ll
    M llvm/test/CodeGen/Thumb2/mve-vmvnimm.ll

  Log Message:
  -----------
  [ARM] Generate VDUP(Const) from constant buildvectors

If we cannot otherwise use a VMOVimm/VMOVFPimm/VMVNimm, fall back to
producing a VDUP(const) as opposed to a constant pool load. This will at
least be smaller codesize and can allow the VDUP to be folded into other
instructions.

Differential Revision: https://reviews.llvm.org/D103808