LTO and the inlining of functions only called once.

Richard Guenther richard.guenther@gmail.com
Sat Oct 10 17:16:00 GMT 2009


On Sat, Oct 10, 2009 at 6:24 PM, Jeff Law <law@redhat.com> wrote:
> On 10/10/09 09:17, Daniel Jacobowitz wrote:
>>
>> On Sat, Oct 10, 2009 at 02:31:25PM +0200, Jan Hubicka wrote:
>>
>>>
>>> My solution would be probably to pass -fdump-ipa-inline parameter to lto
>>> compilation and read the log.  It lists the inlining decisions and if
>>> something is not inlined, you get dump of reason why.
>>>
>>
>> GCC's dumps are really aimed at compiler developers.  I think we would
>> benefit from more "what is the compiler doing to my code" options
>> (producing "note:"); things like which functions were inlined, which
>> loops unrolled.  We do already have this for vectorization.
>>
>
> Interestingly enough, some of the Red Hat folks were having this exact
> discussion re: inlining with a customer last week.
>
> What I was starting to think was to include both functions which were
> inlined, but also functions which were not inlined and the heuristic limits
> that caused the function not to be inlined.

Well - that will print one diagnostic per callgraph edge.  A bit too much, no?

Richard.



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