What happened to the IRA interprocedural reg-alloc work? (function_used_regs and friends)

[Vladimir Makarov]

On 12-10-15 7:14 AM, Steven Bosscher wrote:
> Hi Vlad,
>
> While browsing through old yara/ira patches, I came across this patch
> of yours from several years ago:
>
> http://gcc.gnu.org/ml/gcc-patches/2007-01/msg01625.html
>
> That work was in your IRA presentation at the GCC summit in 2007, and
> it was also part of the initial merge request for IRA. But it's not
> currently in the trunk and it doesn't appear to ever have been there
> (nothing in the ChangeLogs about removing/adding this).
>
> What happened to the patch?
>
>
As I remember, the performance improvement from this optimization was 
very small.  There were problems in reviewing IRA and I decided to 
simplify this task.

May be it is worth to return to this work.