[vta] Port of r148760 to vta branch

[Alexandre Oliva]

On Jun 26, 2009, Jakub Jelinek <jakub@redhat.com> wrote:

> Here is a port of the r148760 trunk commit to vta branch, on top of the
> patch I've posted yesterday.

This patch is ok for VTA and VTA4.4 branches, thanks.

> On the HTML401F.class testcase from x86_64-linux bootstrap the
> compile times and maximum memory usage are:
> 			maxVIRT	maxRSS	TIME
> vanilla VTA		2973004	2880412	24:47
> VTA with 1st patch	2972964	2880396	18:54
> VTA with both patches	1696492	1603936	17:55

Wow!

> There are some small differences in debuginfo generated by this patch, but
> they don't look wrong to me.

Agreed, this kind of change is fine:

> It is mainly preferring variable objects from the former dst set
> (i.e. one where we accumulate merges into) instead of from src (the bb
> we are merging into it).

-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer