PowerPC suboptimal "add with carry" optimization

David Edelsohn dje.gcc@gmail.com
Mon Apr 26 13:57:00 GMT 2010


On Mon, Apr 26, 2010 at 9:22 AM, Joakim Tjernlund
<joakim.tjernlund@transmode.se> wrote:
>
> David Edelsohn <dje.gcc@gmail.com> wrote on 2010/04/26 14:54:55:
>>
>> On Mon, Apr 26, 2010 at 8:21 AM, Joakim Tjernlund
>> <joakim.tjernlund@transmode.se> wrote:
>> > Manuel López-Ibáñez <lopezibanez@gmail.com> wrote on 2010/04/26 13:59:04:
>> >> On 26 April 2010 09:13, Joakim Tjernlund <joakim.tjernlund@transmode.se> wrote:
>> >> > Ian Lance Taylor <iant@google.com> wrote on 2010/04/25 20:07:03:
>> >> >> Joakim Tjernlund <joakim.tjernlund@transmode.se> writes:
>> >> >>
>> >> >> > Noticed that gcc 4.3.4 doesn't optimize "add with carry" properly:
>> >> >>
>> >> >> Please file a missed-optimization report according to
>> >> >> http://gcc.gnu.org/bugs/ .  Thanks.
>> >> >
>> >> > I rather not, going through all that just for one odd report. I was hoping
>> >> > an interested part would pick it up from my email.
>> >>
>> >> What is to be done besides what you have done here but in a more
>> >> useful, structured manner? I am asking because we want to make things
>> >> simple but not simpler than they become more complex for us.
>> >
>> > Lots of stuff to read on that page, lots of info to supply,
>> > registering an account, specify all that system info and so on.
>>
>> You do not need to register an account to report a bug or request a
>
> Just tried that and don't see that.

Sorry, I was mistaken.  I thought that one could submit bug reports
without registering an account.

Thanks for opening a PR for the enhancement request.

Thanks, David



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