[PATCH] D24203: [LoopUnroll] Properly update loop-info when cloning prologues and epilogues.

[Michael Zolotukhin via llvm-commits]

mzolotukhin created this revision.
mzolotukhin added reviewers: chandlerc, sanjoy, hfinkel.
mzolotukhin added subscribers: silvas, llvm-commits.

When cloning blocks for prologue/epilogue we need to replicate the loop
structure from the original loop. It wasn't a problem for the innermost
loops, but it led to an incorrect loop info when we unrolled a loop with
a child loop - in this case created prologue-loop had a child loop, but
loop info didn't reflect that.

This fixes PR28888.

https://reviews.llvm.org/D24203

Files:
  lib/Transforms/Utils/LoopUnrollRuntime.cpp
  test/Transforms/LoopUnroll/pr28888.ll

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