[llvm] r277690 - Revert "GVN-hoist: enable by default" & "Make GVN Hoisting obey optnone/bisect."

[Sebastian Pop via llvm-commits]

I will need a preprocessed file or a reduced testcase:
with the same cmake options as the bot, I was not able to see the fail
on x86_64-linux.
This was both when compiling with the system's gcc 5.4 and clang 3.8.
The fail may be related to the libc of the bot.

Thanks,
Sebastian

On Thu, Aug 4, 2016 at 8:10 AM, Sebastian Pop <sebpop at gmail.com> wrote:
> I am looking at this fail.
> I think I have enough information from the bot on how to reproduce the bug.
>
> On Thu, Aug 4, 2016 at 12:44 AM, Daniel Berlin <dberlin at dberlin.org> wrote:
>>
>>
>> On Wed, Aug 3, 2016 at 10:17 PM, Bruno Cardoso Lopes
>> <bruno.cardoso at gmail.com> wrote:
>>>
>>> Hi Daniel,
>>>
>>> On Wed, Aug 3, 2016 at 9:59 PM, Daniel Berlin <dberlin at dberlin.org> wrote:
>>> > so here's the super-curious question in my mind:
>>> >
>>> > Why didn't this break when this was enabled by default for like a month
>>> > before :)
>>>
>>> Not really sure why, I was not following the bots back then.
>>
>>
>> Yeah, it's semi-rhetorical. It's just really odd, and makes me think it's
>> related to one or more of the optimizations sebastian added (for example,
>> not recomputing DFS numbers).
>>
>>>
>>> Where
>>> there many changes following up the time it got off? Another
>>> possibility is that the bot could have been broken by another change
>>> that hid this?
>>> I can get my hands on the reproducer and send to you tomorrow if that's
>>> helpful.
>>>
>>
>> That would be really helpful.
>>
>>>
>>> -Bruno
>>>
>>> --
>>> Bruno Cardoso Lopes
>>> http://www.brunocardoso.cc
>>
>>