RFA: patch solving one IRA problem reported in PR37243

[Vladimir Makarov]

Jeff Law wrote:
> Vladimir Makarov wrote:
>> The following patch solves IRA regression on pr36222 and p36246 of gcc
>> testsuite.  The analysis of the problem could be found in
>>
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37243
>>
>> The patch has been bootstrapped sucessfully on x86_64.  It also
>> improves SPEC results at least for x86.
>>
>> 2008-08-29  Vladimir Makarov  <vmakarov@redhat.com>
>>
>>    PR rtl-opt/37243
>>
>>    * ira-conflicts.c (REG_SUBREG_P, go_through_subreg): New.
>>    (process_regs_for_copy): Process subregs.  Refine check when cost
>>    is taken into account in ira-costs.c.
>>    (process_reg_shuffles): Use REG_SUBREG_P.
>>    (add_insn_allocno_copies): Ditto.  Ignore modes.
>>
>>    * ira-color.c (conflict_allocno_vec): New.
>>    (COST_HOP_DIVISOR): New macro.
>>    (update_copy_costs_1): Use it.
>>    (update_conflict_hard_regno_costs): New function.
>>    (assign_hard_reg): Use it.
>>    (ira_color): Allocate and free conflict_allocno_vec.
>>   
> OK.  Please install if you haven't done so already.
Thanks, Jeff.  I've just did it.