[all-commits] [llvm/llvm-project] dfe3ff: [ARM] Transforming memset to Tail predicated Loop

[malJaj via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dfe3ffaa4a47ea93cc289b4496c093fbaf73adbc
      https://github.com/llvm/llvm-project/commit/dfe3ffaa4a47ea93cc289b4496c093fbaf73adbc
  Author: Malhar Jajoo <malhar.jajoo at arm.com>
  Date:   2021-05-07 (Fri, 07 May 2021)

  Changed paths:
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/lib/Target/ARM/ARMISelLowering.h
    M llvm/lib/Target/ARM/ARMInstrMVE.td
    M llvm/lib/Target/ARM/ARMSelectionDAGInfo.cpp
    M llvm/lib/Target/ARM/ARMSubtarget.h
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/memcall.ll
    M llvm/test/CodeGen/Thumb2/mve-gather-scatter-optimisation.ll
    M llvm/test/CodeGen/Thumb2/mve-phireg.ll
    M llvm/test/CodeGen/Thumb2/mve-tp-loop.ll
    M llvm/test/CodeGen/Thumb2/mve-tp-loop.mir

  Log Message:
  -----------
  [ARM] Transforming memset to Tail predicated Loop

This patch converts llvm.memset intrinsic into Tail Predicated
Hardware loops for a target that supports the Arm M-profile
Vector Extension (MVE).

The llvm.memset is converted to a TP loop for both
constant and non-constant input sizes (of llvm.memset).

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D100435