Would you send me your hard float experiment results you presented in Budapest?

David Rusling david.rusling at linaro.org
Fri Sep 2 10:41:04 UTC 2011


Zach,
	you'd need to use multiarch and have multiple installed libraries so that you could support both hard and soft float ABI.   Does Android do anything different / interesting in its image / shared library loader(s)?
Dave

On 30 Aug 2011, at 17:24, Zach Pfeffer wrote:

> Steve,
> 
> I'd like you to meet Jim who did the initial hardfloat work. This
> email contains the results that Jim produced.
> 
> I believe that the conclusion was that skia and webkit may benefit,
> but that such benefits would impose an undue burden on Android's
> distribution model which tries to create libs that can run on as many
> architectures as possible.
> 
> -Zach
> 
> 
> ---------- Forwarded message ----------
> From: Jim Huang <jserv at 0xlab.org>
> Date: 7 August 2011 18:01
> Subject: Re: Would you send me your hard float experiment results you
> presented in Budapest?
> To: Zach Pfeffer <zach.pfeffer at linaro.org>
> 
> 
> 2011/8/7 Zach Pfeffer <zach.pfeffer at linaro.org>:
>> Jim,
>> 
>> Thanks. Would it be possible to post them by the end of the day?
> 
> skia ->
> 
>    Switch from VFP back to fixed scalar based calculation
> 
>    Previous configuration enabled ARM VFP for scalar float, but VFP on
>    ARM11 is not as powerful as VFPv3 or NEON.
> 
>    Reference benchmark:
>    Item            Fixed based     VFP-based
>    ------------    -----------     ---------
>    Draw Canvas     58.37 fps       58.40 fps
>    Draw Circle     37.48 fps       22.93 fps
>    Draw Circle2    17.14 fps       18.31 fps
>    Draw Rect       17.62 fps       20.69 fps
>    Draw Arc        24.79 fps       27.45 fps
>    Draw Image      19.08 fps       18.73 fps
>    Draw Text       29.22 fps       25.79 fps
> 
> 
>> 
>> Also, have you sync'd up with Mike? He wants to negotiate on your contract.
> 
> I sent mail to Mike already.  I don't know how to proceed.
> 
> Thanks,
> -jserv
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