[all-commits] [llvm/llvm-project] 6dcbc3: Revert "[ARM][LowOverheadLoops] Adjust Start inser...

[David Green via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 6dcbc323fd8778ba6db1c4e76c809f93fc82efc5
      https://github.com/llvm/llvm-project/commit/6dcbc323fd8778ba6db1c4e76c809f93fc82efc5
  Author: David Green <david.green at arm.com>
  Date:   2020-10-20 (Tue, 20 Oct 2020)

  Changed paths:
    M llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/lstp-insertion-position.mir
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-after-dlstp.mir
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-operand.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/move-def-before-start.mir
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/move-start-after-def.mir
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/reductions.ll
    M llvm/test/CodeGen/Thumb2/mve-float16regloops.ll
    M llvm/test/CodeGen/Thumb2/mve-float32regloops.ll
    M llvm/test/CodeGen/Thumb2/mve-fma-loops.ll
    M llvm/test/CodeGen/Thumb2/mve-gather-scatter-optimisation.ll
    M llvm/test/CodeGen/Thumb2/mve-gather-scatter-ptr-address.ll
    M llvm/test/CodeGen/Thumb2/mve-gather-scatter-tailpred.ll
    M llvm/test/CodeGen/Thumb2/mve-postinc-lsr.ll
    M llvm/test/CodeGen/Thumb2/mve-pred-threshold.ll
    M llvm/test/CodeGen/Thumb2/mve-satmul-loops.ll

  Log Message:
  -----------
  Revert "[ARM][LowOverheadLoops] Adjust Start insertion."

This reverts commit 38f625d0d1360b035271422bab922d22ed04d79a.

This commit contains some holes in its logic and has been causing
issues since it was commited. The idea sounds OK but some cases were not
handled correctly. Instead of trying to fix that up later it is probably
simpler to revert it and work to reimplement it in a more reliable way.