------- Comment #13 from dnovillo at google dot com 2009-02-18 12:26 -------
Subject: Re: LTO and -fwhole-program do not play
along well
On Tue, Feb 17, 2009 at 20:42, hubicka at ucw dot cz
<gcc-bugzi...@gcc.gnu.org> wrote:
>
>
> ------- Comment #12 from hubicka at ucw dot cz 2009-02-18 01:42 -------
> Subject: Re: LTO and -fwhole-program do not play along well
>
>> I believe we should be set already. During LTO read, we execute
>> ipa_passes, which runs all_small_ipa_passes. So,
>> pass_ipa_function_and_variable_visibility is run both while writing
>> the IL and right after we read it in.
>>
>> Is that what you were referring to?
>
> Well, you need to localize stuff at WHOPR stage, so small IPA passes are
> unlikely going to be executable there except for those not needing
> function bodies (like the visibility pass, but unlike inlining and other
> stuff included). Are those still skipped via the lto flag gate?
Yes, with whopr, the only time we can ever operate in whole-program
mode is when we run the analysis stage (-fwpa). The other two stages
cannot operate in whole-program mode as they only deal with a partial
graph.
For -flto, however, we can enable whole-program mode as we are dealing
with the whole callgraph at once.
Diego.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39203
