[LLVMdev] RFC: GLIBCXX_DEBUG ScheduleDAG Patch

Evan Cheng
2007-12-22T08:33:04Z

On Dec 20, 2007, at 2:43 PM, David Greene wrote:

> On Monday 17 December 2007 19:48, Chris Lattner wrote:
>> On Mon, 17 Dec 2007, David Greene wrote:
>>> On Monday 17 December 2007 13:39, Evan Cheng wrote:
>>>> My only concern is the potential compile time impact. Do you
see
>>>> any?
>>>
>>> I don't notice any, but then I'm not particularly looking
for that
>>> either. I'll run some tests.
>>
>> Thanks.  5% slowdowns are generally not noticable, but we care :)
>
> After some very simple testing, I see slowdowns of around 1.7%.  I
> assume
> this is ok, but want to check.

Can you clarify? Is this 1.7% slowdown of scheduling time or overall
codegen time? If it's the later, then it seems a bit too much. Also,
please test it with all the MultiSource/Applications.

Thanks,

Evan

>
>> Re licensing, we have no problem slurping in boost code.  Please
>> do make
>> it follow the LLVM standards (80 cols and a doxygen comment above
>> each
>> class saying what it is for).  For an example of how to do the
>> license,
>> see include/llvm/ADT/scoped_ptr.h.
>
> No problem.
>
>                                        -Dave
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