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Date: Wed, 13 Jul 2011 15:55:00 -0000
Message-ID: <CAD_=9DQjNChRZJoMe53ckihhAJfefx_DKYWyoxxjZnqemN-a2g@mail.gmail.com>
Subject: Re: IPA and LTO
From: Diego Novillo <dnovillo@google.com>
To: AJM-2 <mcpherson.aj@gmail.com>
Cc: gcc@gcc.gnu.org
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On Wed, Jul 13, 2011 at 10:22, AJM-2 <mcpherson.aj@gmail.com> wrote:

> My question is whether LTO can be used in this way, to have a simple ipa
> pass called once at link time with access to the function bodies, and if =
so
> how is this achieved? =C2=A0cgraph_function_body_availability seems to on=
ly be
> half the story.

Yes, it can.  You seem to be describing what GCC calls "simple IPA
pass".  These are passes that cannot run in partitioned LTO mode, as
they require the function bodies to operate.  Look for passes like
pass_ipa_function_and_variable_visibility for an example of a simple
IPA pass.


Diego.