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Re: [google gcc-4_8] increase builtin_expect probability in loop exit test
- From: Xinliang David Li <davidxl at google dot com>
- To: Rong Xu <xur at google dot com>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>, Jan Hubicka <hubicka at ucw dot cz>
- Date: Fri, 11 Oct 2013 14:41:26 -0700
- Subject: Re: [google gcc-4_8] increase builtin_expect probability in loop exit test
- Authentication-results: sourceware.org; auth=none
- References: <CAF1bQ=Qne1ScX9q6w19nyVUGUEDKaFADY7gz46i3ox50LvLGfg at mail dot gmail dot com> <CAAkRFZLa2HcFWtQF1Okt2nt8HHR==maX-FnVhSi3JiWwfH9uVQ at mail dot gmail dot com> <CAF1bQ=TBBtJkQNeBNxofgtm0R_u=QgZ0u0q=86dLg8sa70-wYQ at mail dot gmail dot com>
Should it be max + some_delta then?
David
On Fri, Oct 11, 2013 at 2:32 PM, Rong Xu <xur@google.com> wrote:
> I want to differentiate the cases w/o and w/ builtin.
> If I take the max, they will be the same (91%).
>
> -Rong
>
> On Fri, Oct 11, 2013 at 2:26 PM, Xinliang David Li <davidxl@google.com> wrote:
>> Why this 'percent += 4' instead of taking the max?
>>
>> David
>>
>> On Fri, Oct 11, 2013 at 2:10 PM, Rong Xu <xur@google.com> wrote:
>>> The trunk version of this patch is submitted for review.
>>>
>>> David: can we have this patch for google/gcc-4_8 branch first?
>>> It tested with regression and google internal benchmarks.
>>>
>>> Thanks,
>>>
>>> -Rong