Re: [RFC] fbdev/riva:change to use generice function to implement reverse_order()

From	Tomi Valkeinen <tomi.valkeinen@ti.com>
Newsgroups	linux.kernel
Subject	Re: [RFC] fbdev/riva:change to use generice function to implement reverse_order()
Date	2015-08-21 10:10 +0200
Message-ID	<pZPyH-6cu-23@gated-at.bofh.it> (permalink)
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On 21/08/15 10:46, yalin wang wrote:

>>> i investigate on arm64 platforms:
>>
>> Ok. So is any arm64 platform actually using these devices? If these
>> devices are mostly used by 32bit x86 platforms, optimizing them for
>> arm64 doesn't make any sense.
>>
>> Possibly the patches are still good for x86 also, but that needs to be
>> proven.
>>
> not exactly, because x86_64 don’t have hardware instruction to do rbit OP,
> i compile by test :

For old drivers i386 may be more relevant than x86_64.

So you don't have the actual HW?

These kind of optimizations should have some real world measurements,
not just compiling, looking at the assembly and guessing whether it's
faster or not.

 Tomi

Thread

Re: [RFC] fbdev/riva:change to use generice function to implement   reverse_order() Tomi Valkeinen <tomi.valkeinen@ti.com> - 2015-08-20 13:10 +0200
  Re: [RFC] fbdev/riva:change to use generice function to implement reverse_order() yalin wang <yalin.wang2010@gmail.com> - 2015-08-20 13:40 +0200
    Re: [RFC] fbdev/riva:change to use generice function to implement  reverse_order() Tomi Valkeinen <tomi.valkeinen@ti.com> - 2015-08-21 08:50 +0200
      Re: [RFC] fbdev/riva:change to use generice function to implement reverse_order() yalin wang <yalin.wang2010@gmail.com> - 2015-08-21 09:50 +0200
        Re: [RFC] fbdev/riva:change to use generice function to implement  reverse_order() Tomi Valkeinen <tomi.valkeinen@ti.com> - 2015-08-21 10:10 +0200
          Re: [RFC] fbdev/riva:change to use generice function to implement  reverse_order() Afzal Mohammed <afzal.mohd.ma@gmail.com> - 2015-08-22 10:00 +0200
            Re: [RFC] fbdev/riva:change to use generice function to implement reverse_order() yalin wang <yalin.wang2010@gmail.com> - 2015-08-24 10:40 +0200
              Re: [RFC] fbdev/riva:change to use generice function to implement  reverse_order() Afzal Mohammed <afzal.mohd.ma@gmail.com> - 2015-08-24 15:50 +0200

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