Re: [PATCH v3 0/7] fixes for rare issues

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On Tue, Aug 1, 2017 at 12:42 AM, Luc Van Oostenryck
<luc.vanoostenryck@xxxxxxxxx> wrote:

>> One of the thing I haven't tested is the performance.
>> Several things here can make things slower:
>> - REPEAT_CFG_CLEANUP is now set after every call to rewrite_branch()
>>   (and will then trigger at some point a call to kill_unreachable_bbs())
>> - kill_unreachable_bbs() set REPEAT_CSE is a BB have been deleted
>>   (which may trigger another CSE cycle possibly not present before)
>> - the bb_depends_on() change add some code with looping through
>>   the BB's instructions, nothing really heavy but still some more code
>>   to run
>> All these are needed though.
>
> And indeed I see that some tests that took me 38s now take 48s.
> I'll look tomorrow for the real cause and see what can be done there.

OK. That was a false alert, I was still running with debug on.

-- Luc
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