[llvm-bugs] [Bug 28393] New: [AArch64] r273755 miscompiles libjpeg

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https://llvm.org/bugs/show_bug.cgi?id=28393

            Bug ID: 28393
           Summary: [AArch64] r273755 miscompiles libjpeg
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: sebpop at gmail.com
                CC: llvm-bugs at lists.llvm.org, matze at braunis.de
    Classification: Unclassified

git bisect points to this patch which miscompiles libjpeg in Android compiled
for aarch64:
http://reviews.llvm.org/rL273755

Basic instructions on how to reproduce the problem are in
https://github.com/android-ndk/ndk/issues/110

I first thought that a change to GVN PRE was producing the wrong code, though
git bisect now points to this patch: most likely PRE exposes a pattern that is
then producing wrong code with the change to the scheduler.

I am still struggling reducing a testcase with bugpoint.

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