> On Mon, Jul 15, 2013 at 11:05 AM, Jan Hubicka <hubi...@ucw.cz> wrote:
>
> > The next thing is how to tell GNU LD/Gold the relative order of functions.
> > I.e. my_function_section.order.125 or something like that?
>
> Gold has a --section-ordering-file option that lets you specify the
> order in which sections should appear in the executable. Sections not
> listed there follow the default rules.
Yep, the problem is where to produce the section ordering file.
The scheme is as follows:
- with -fprofile-generate instrument every function entry point and record
time of first and last invocation of the functoin
- At compile time we take functions that are executed during the startup
and we want to order them in the increasing order of the first invocation
time measured at FDO time. So we know the relative position of given
function
in the program, but not the complette function order.
Honza
>
> Ian
