[all-commits] [llvm/llvm-project] bee2f6: [ARM] Introduce t2WhileLoopStartTP

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bee2f618d599201aa0c91d0322f058cc697e0779
      https://github.com/llvm/llvm-project/commit/bee2f618d599201aa0c91d0322f058cc697e0779
  Author: David Green <david.green at arm.com>
  Date:   2021-06-13 (Sun, 13 Jun 2021)

  Changed paths:
    M llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
    M llvm/lib/Target/ARM/ARMBaseInstrInfo.h
    M llvm/lib/Target/ARM/ARMBlockPlacement.cpp
    M llvm/lib/Target/ARM/ARMInstrThumb2.td
    M llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
    M llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
    M llvm/lib/Target/ARM/MVETailPredUtils.h
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/memcall.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/wls-search-pred.mir
    M llvm/test/CodeGen/Thumb2/mve-gather-scatter-optimisation.ll
    M llvm/test/CodeGen/Thumb2/mve-memtp-loop.ll

  Log Message:
  -----------
  [ARM] Introduce t2WhileLoopStartTP

This adds t2WhileLoopStartTP, similar to the t2DoLoopStartTP added in
D90591. It keeps a reference to both the tripcount register and the
element count register, so that the ARMLowOverheadLoops pass in the
backend can pick the correct one without having to search for it from
the operand of a VCTP.

Differential Revision: https://reviews.llvm.org/D103236