On 25.02.2015 19:46, Michael Zimmermann wrote:
> oh ok so linux's div/mod/... assembler is as slow/fast as grub's code?
> Linux uses armv5>= ifdefs. Maybe we could optimized things a little :)
> About scale_nn,
> amarullz(https://plus.google.com/u/0/+AhmadAmarullah/about) wrote a
> optimized version without divs:
> loops: http://pastebin.com/MaZqWSA9
> memcpy: http://pastebin.com/iNq0V5Tw
>
Please try my patch (reattached here after minor fixes). The patch by 
anonymous source, sent by third-party through pastebin isn't acceptable 
from legal perspective
> this code works a little faster. I'm still questioning the efficiency
> math operations because on slow devices there are other bottlenecks of
> the same kind(like de/compression).
>
> On Wed, Feb 25, 2015 at 7:41 PM, Vladimir 'phcoder' Serbinenko
> <phcoder@gmail.com> wrote:
>> ARMv7 doesn't mandate div instructions. It's a separate flag in features.
>> GRUB supports earlier CPUs as well and we use them for testing. My only test
>> machine is armv6
>>
>> Le 2015-02-25 19:38, "Michael Zimmermann" <sigmaepsilon92@gmail.com> a écrit
>> :
>>
>>> Why u think the native div code would crash on most devices? I support
>>> ARMv7+ only anyway.
>>>
>>> On Wed, Feb 25, 2015 at 5:23 PM, Leif Lindholm <leif.lindholm@linaro.org>
>>> wrote:
>>>> On Wed, Feb 25, 2015 at 03:45:40PM +0000, Leif Lindholm wrote:
>>>>>>>> Some technical info:
>>>>>>>> ARMv7
>>>>>>>> Linaro GCC 4.9
>>>>>
>>>>> I don't see any calls to any of the __aeabi helpers generated for this
>>>>> file with current head. Which specific Linaro toolchain are you using?
>>>>> (mine is"Linaro GCC 4.9-2014.09").
>>>>
>>>> Scratch that, I do see them. Just failing to drive the tools properly.
>>>>
>>>> /
>>>>      Leif
>>>>
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