[PATCH] D27004: Set unroll remainder to epilog if profitable

[Evgeny Stupachenko via llvm-commits]

evstupac created this revision.
evstupac added reviewers: mzolotukhin, sanjoy.
evstupac added subscribers: llvm-commits, mzolotukhin, sanjoy, mkuper, Farhana.
evstupac set the repository for this revision to rL LLVM.

Set unroll remainder to epilog if a loop contains phi with constant parameter:

loop:
 pn = phi [Const, PreHeader], [pn.next, Latch]
...

and the Const is modulo of unroll count.


Repository:
  rL LLVM

https://reviews.llvm.org/D27004

Files:
  lib/Transforms/Utils/LoopUnroll.cpp
  test/Transforms/LoopUnroll/runtime-loop5.ll
  test/Transforms/LoopUnroll/unroll-pragmas.ll

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