[oe] [PATCH/RFC] qt4-embedded: tune QT_ARCH for armv6

[Koen Kooi]

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On 04-11-10 19:26, Holger Freyther wrote:
> On 11/04/2010 10:52 AM, Eric Bénard wrote:
>> this is a RFC, I think it can also be used on qt 4.6.x and on armv7.
>> Setting QT_ARCH to armv6 enable some asm optimized functions in QT.
> 
> Do you know the consequences of this change? E.g. in the painting
> engine unaligned memory access will be allowed. I am not sure that Nokia has
> ever benchmarked what is faster (aligned/unaligned) access. So it would be
> very interesting to know the perf difference. E.g. use qttracereply to measure it.
> 
> Phil do you happen to know why unaligned access got allowed starting from
> armv6? How fast will it be?

- From previous experiments the "hardware" unaligned was the same speed as
the sw fixup on armv6.

regards,

Koen
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