[all-commits] [llvm/llvm-project] 7786ac: [ARM] Remove dead mov's in preheader of tail predi...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7786ac8377a27f3e78bfb88bf59ebc489e26a5cd
      https://github.com/llvm/llvm-project/commit/7786ac8377a27f3e78bfb88bf59ebc489e26a5cd
  Author: David Green <david.green at arm.com>
  Date:   2021-02-11 (Thu, 11 Feb 2021)

  Changed paths:
    M llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/exitcount.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-operand.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/while-loops.ll
    M llvm/test/CodeGen/Thumb2/mve-blockplacement.ll
    M llvm/test/CodeGen/Thumb2/mve-postinc-dct.ll
    M llvm/test/CodeGen/Thumb2/mve-postinc-lsr.ll
    M llvm/test/CodeGen/Thumb2/mve-pred-vctpvpsel.ll

  Log Message:
  -----------
  [ARM] Remove dead mov's in preheader of tail predicated loops

With t2DoLoopDec we can be left with some extra MOV's in the preheaders
of tail predicated loops. This removes them, in the same way we remove
other dead variables.

Differential Revision: https://reviews.llvm.org/D91857