Blackfin rtx_costs tweaks

[Bernd Schmidt]

bfin_rtx_costs is more or less unchanged from when the port was based on
3.4 and isn't prepared to deal with the new and improved combiner that
examines the costs of its combinations.  We're missing a good deal of
optimizations.

The following patch was experimentally about the best I could do to get
our 4.1-based compiler to generate better code.  Regression tested
against bfin-elf and committed as 119579.


Bernd
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: costs.diff
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20061206/86659ff3/attachment.ksh>