[PATCH, tree-optimization] Fix for PR 52868

[Igor Zamyatin]

Hi all!

I'd like to post for review the patch which makes some costs adjusting
in get_computation_cost_at routine in ivopts part.
As mentioned in the PR changes also fix the bwaves regression from PR 52272.
Also changes introduce no degradations on spec2000/2006 and
EEMBC1.1/2.0(this was measured on Atom) on x86


Bootstrapped and regtested on x86. Ok to commit?


Changelog:

2012-04-26  Yuri Rumyantsev  <yuri.rumyant...@intel.com>

        * tree-ssa-loop-ivopts.c (get_computation_cost_at): Add cost
        of extra addition if cost of address difference is high enough.

Thanks,
Igor

ivopts.patch
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