[PATCH] D126322: [ARM] Recognize t2LoopEnd for software pipelining

[David Penry via Phabricator via llvm-commits]

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- Add t2LoopEnd to TargetInstrInfo::analyzeBranch and related functions.  As there are many side effects of analyzing a branch, only do so if software pipelining is enabled to maintain previous behavior when pipelining is not desired.
- Make sure that t2LoopEndDec is immediately followed by a t2B when it is synthesized from a t2LoopEnd. This is done because the t2LoopEnd might have acquired a fall-through path, but IfConversion assumes that fall-through are only possible on analyzable branches.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126322

Files:
  llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
  llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
  llvm/test/CodeGen/Thumb2/swp-fixedii-le.mir

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