[cfe-dev] [LLVMdev] [3.6 Release] RC3 has been tagged

[Jack Howarth]

On Wed, Feb 18, 2015 at 10:55 AM, Jack Howarth
<howarth.mailing.lists at gmail.com> wrote:
> I finally got around to testing this on a Bloomfield processor (Early
> 2009 MacPro 2x2.66 GHz dual-quad core) and the regressions from
> http://llvm.org/bugs/show_bug.cgi?id=22589 are even more severe. For
> 10 runs of scimark2_1c built with "-O3 -march=native"...
>
> llvm 3.5.1   1204.16+/-2.66 Mflops
> 3.6 branch   866.49+/-1.26 Mflops
>

The proposed patch mitigates the damage on Bloomfield...

patched 3.6svn   1073.69+/-1.97

so we are only regressing the benchmark 24% rather than 39% there.
         Jack


> Do you seriously want to ship with a 39% performance regression in a
> major benchmark?
>               Jack
>
> On Wed, Feb 18, 2015 at 10:33 AM, Renato Golin <renato.golin at linaro.org> wrote:
>> On 18 February 2015 at 14:37, Hal Finkel <hfinkel at anl.gov> wrote:
>>> I think that, unfortunately, for the others, there's not sufficient time to investigate before the release.
>>
>> This looks like a serious case for 3.6.1, not RC5.
>>
>> cheers,
>> --renato
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