[cfe-dev] Track locations of individual loads in -Rpass remarks (Re: [polly] Add diagnostic remark for ReportVariantBasePtr)

[Diego Novillo]

On Thu, Jul 24, 2014 at 4:16 PM, Diego Novillo <dnovillo at google.com> wrote:
> On Mon, Jul 21, 2014 at 9:36 AM, Tobias Grosser <tobias at grosser.es> wrote:
>
>> Diego, you just recently run the -gcolumn-info test cases on your internal
>> code base and on the gdb test suite. Would it be difficult for
>> you to create similar information for the attached patch to get an idea of
>> how much overhead this patch would cause?
>
> A full comparison build is now running. I should have results soon. In the
> meantime, I tried it on a target that generates a 30Mb shared object:
>
> Without your patch, I see these segment sizes:
>
>      text      data       bss     debug debug.dwo    symtab    strtab
> other     total filename
>   8505260    444768    308624  12140854         0   1226952   5631742
> 1632669  29588116 file.so
>
>
> With your patch:
>      text      data       bss     debug debug.dwo    symtab    strtab
> other     total filename
>   8505260    444768    308624  12565490         0   1226952   5631742
> 1632669  30012748 file.so
>
> That's a 3.5% growth in debug info size, for a total size increase of ~1%.
>
> I'll send numbers over a full build as soon as I get them.

I've got full numbers now. The extreme I chose was an outlier. I've
done full builds over our code base. The increase on average debug
sizes is 0.1%. The total file size increase is ~0%.

I don't think your change will make a substantial difference in debug
info sizes. At least, not in what I've observed.


Diego.