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

[Bruno Cardoso Lopes via llvm-commits]

Hi Sebastian,

Attached the reproducer with a preprocessed and bitcode testcase. Let
me know if you need any help.

On Thu, Aug 4, 2016 at 7:30 AM, Sebastian Pop <sebpop at gmail.com> wrote:
> 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
>>>
>>>



-- 
Bruno Cardoso Lopes
http://www.brunocardoso.cc
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