[PATCH] D43876: [LoopUnroll] Peel off iterations if it makes conditions true/false.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: mkuper, mkazantsev, efriedma.

If the loop body contains conditions of the form IndVar < #constant, we
can remove the checks by peeling off #constant iterations. This patch
initially starts out with supporting very simple conditions. It can be
made more powerful in follow-up commits.

This improves codegen for PR34364.


https://reviews.llvm.org/D43876

Files:
  lib/Transforms/Utils/LoopUnrollPeel.cpp
  test/Transforms/LoopUnroll/peel-loop-conditions.ll

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