Re: Fix reload1.c warning for some targets

[Richard Sandiford <rdsandiford@googlemail.com>]

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.

Richard