[PATCH] D58929: [LoopRotate] fix crash encountered with callbr

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers created this revision.
nickdesaulniers added reviewers: craig.topper, jyknight.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

While implementing inlining support for callbr
(https://bugs.llvm.org/show_bug.cgi?id=40722), I hit a crash in Loop
Rotation when trying to build the entire x86 Linux kernel
(drivers/char/random.c). This is a small fix up to r353563.

Test case is drivers/char/random.c (with callbr's inlined), then ran
through creduce, then `opt -opt-bisect-limit=<limit>`, then bugpoint.

Thanks to Craig Topper for immediately spotting the fix, and teaching me
how to fish.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D58929

Files:
  llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
  llvm/test/Transforms/LoopRotate/callbr.ll

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