[PATCH] D63336: [CodeGen] Add RequiresLatch to HardwareLoopInfo

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: hfinkel, markus, lebedev.ri, JonChesterfield, dmgreen, SjoerdMeijer.
Herald added a subscriber: javed.absar.
Herald added a project: LLVM.

The HardwareLoops pass finds exit blocks with a scevable exit count. These exit blocks are usually loop latches, but not always. Add an option to the pass, and a member to HardwareLoopInfo, which allows the user and backend to specify whether the counter decrement should be placed in a latch.


Repository:
  rL LLVM

https://reviews.llvm.org/D63336

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  lib/CodeGen/HardwareLoops.cpp
  lib/Target/ARM/ARMTargetTransformInfo.cpp
  test/Transforms/HardwareLoops/ARM/structure.ll
  test/Transforms/HardwareLoops/unconditional-latch.ll

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