[all-commits] [llvm/llvm-project] f08c37: [ARM] Disable WLSTP loops

[David Green via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: f08c37da7bd40b6f70b5def310aa5b6acd2613dc
      https://github.com/llvm/llvm-project/commit/f08c37da7bd40b6f70b5def310aa5b6acd2613dc
  Author: David Green <david.green at arm.com>
  Date:   2020-11-20 (Fri, 20 Nov 2020)

  Changed paths:
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/fast-fp-loops.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-operand.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-tail-data-types.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/reductions.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/while-loops.ll
    M llvm/test/CodeGen/Thumb2/mve-fma-loops.ll
    M llvm/test/CodeGen/Thumb2/mve-postinc-lsr.ll

  Log Message:
  -----------
  [ARM] Disable WLSTP loops

This checks to see if the loop will likely become a tail predicated loop
and disables wls loop generation if so, as the likelihood for reverting
is currently too high. These should be fairly rare situations anyway due
to the way iterations and element counts are used during lowering. Just
not trying can alter how SCEV's are materialized however, leading to
different codegen.

It also adds a option to disable all while low overhead loops, for
debugging.

Differential Revision: https://reviews.llvm.org/D91663