[PATCH] D63440: [LoopUnroll] Generate sub nuw for loop index

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: dmgreen, fhahn, anna.
Herald added subscribers: arphaman, zzheng.
Herald added a project: LLVM.

Use Call NUWSub to generate the indexes within the unrolled body since we know that the value won't be wrapping around zero.


Repository:
  rL LLVM

https://reviews.llvm.org/D63440

Files:
  lib/Transforms/Utils/LoopUnrollRuntime.cpp
  test/Transforms/LoopUnroll/nuw-backedge.ll
  test/Transforms/LoopUnroll/runtime-loop-multiple-exits.ll
  test/Transforms/LoopUnroll/runtime-unroll-remainder.ll

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