Le Tue Feb 24 2015 at 11:01:03 AM, Michael Zimmermann <
address@hidden> a écrit :
the function seems to use __aeabi_uidiv. I'm not sure if this is a sw
or hw implementation.
software. Try attached patch
Full code:
ASM: http://pastebin.com/FnPRZt1H
pseudo-C: http://pastebin.com/dH3YBk46
On Tue, Feb 24, 2015 at 10:51 AM, Vladimir 'phcoder' Serbinenko
<address@hidden> wrote:
> Did you try to look at ASM of the function in question? Do you compile to
> thumb? Multiplication sometimes generates function calls in thumb. Try
> marking the scaling function as arm explicitly
>
> Le 2015-02-24 10:39, "Michael Zimmermann" <address@hidden> a écrit
> :
>>
>> Any ideas what could slow down the image scaling algorithm?
>> The only reasons I could think of would either be slow memory or some
>> compiler problems. Since my Ram is mapped cachable I don't think the
>> RAM is too slow.
>>
>> I even forces using the Nearest neighbor algorithm already. It speeds
>> things up a lot but it's not as fast as you'd expect.
>>
>> Some technical info:
>> ARMv7
>> Linaro GCC 4.9
>> MMU setup is done by the previous bootloader(I disabled GRUB's (uboot)
>> MMU setup - it prooved to be faster)
>>
>> _______________________________________________
>> Grub-devel mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/grub-devel
>
>
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scale.diff