Fix reload1.c warning for some targets

[Jeff Law]

On 08/13/2015 02:29 PM, Richard Sandiford wrote:
> Jeff Law <law@redhat.com> writes:
>> On 08/05/2015 08:18 AM, Richard Sandiford wrote:
>>> Building some targets results in a warning about orig_dup[i] potentially
>>> being used uninitialised.  I think the warning is fair, since it isn't
>>> obvious that the reog_data-based loop bound remains unchanged between:
>>>
>>>     for (i = 0; i < recog_data.n_dups; i++)
>>>       orig_dup[i] = *recog_data.dup_loc[i];
>>>
>>> and:
>>>
>>>     for (i = 0; i < recog_data.n_dups; i++)
>>>       *recog_data.dup_loc[i] = orig_dup[i];
>>>
>>> Tested on x86_64-linux-gnu.  OK to install?
>>>
>>> Thanks,
>>> Richard
>>>
>>> gcc/
>>> 	* reload1.c (elimination_costs_in_insn): Make it obvious to the
>>> 	compiler that the n_dups and n_operands loop bounds are invariant.
>> So thinking more about this, I think the best way forward is to:
>>
>>     1. Create a new BZ with the false positive extracted from c#4.
>>
>>     2. Install your patch and close 55035.
>>
>> I'll take care of #1, you can handle #2.
>
> Thanks, I've now done #2.
THanks.  I've got the new BZ in place.  So we both pop one item off our 
stacks.

jeff