Re: [Qemu-devel] [PATCH v3 00/22] re-factor softfloat and add fp16 functions

[Howard Spoelstra]

On Thu, Jan 25, 2018 at 1:09 AM, Richard Henderson
<address@hidden> wrote:
> On 01/24/2018 01:49 PM, Howard Spoelstra wrote:
>> Hi,
>>
>> I built qemu-system-ppc for OSX and Windows from
>> https://github.com/stsquad/qemu/tree/softfloat-refactor-and-fp16-v3
>> and noticed a considerable drop in floating point performance on both
>> hosts.
>> Running Mac OS 9.2 in OSX, using MacBench 3.0, the score for the
>> floating point performance dropped from ~60 to ~42.
>>
>> Recent tcg optimisations had improved processor and floating point
>> performance considerably, but that gain seems to be more than lost for
>> the floating point performance.
>>
>> Any idea what is causing this?
>
> Is this a 64-bit or a 32-bit build?
>
> We made a conscious choice to share code and use all 64-bit operations, under
> the assumption that x86_64 is the most common host.
>
> Otherwise we have not really done extensive benchmarking.
>
>
> r~

Hi,

Both OSX and Windows builds are 64-bit.

Best,
Howard