[llvm-bugs] [Bug 24738] Loop vectorizer introduces bad "undef"

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Apr 29 02:38:56 PDT 2016


Mattias Eriksson <mattias.v.eriksson at ericsson.com> changed:

           What    |Removed                     |Added
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |---

--- Comment #7 from Mattias Eriksson <mattias.v.eriksson at ericsson.com> ---
(In reply to comment #6)
> Ah, I see now, I thought opt was failing. Do you by any chance have less
> simplified example? I can see that this might be an issue, but I suspect
> that the rootcause might be somewhere else and to verify it it would be
> super helpful to have a test that really exposes a bug (in the current
> reproducer the undef value doesn't matter as we never take the corresponding
> edge).

Unfortunately I do not have saved the original problem. I remember that I found
it in randomized testing and that it was rare. I also remember that it was a
real wrong-code error that I had to spend a day or so to track down.

I will try to make an effort in finding a "real" error again by running some
more randomized testing during the weekend.

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