Hi,
Le 04/11/2010 19:26, Holger Freyther a écrit :
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?
in the painting engine, from what I saw in the .h, the asm optimisations are
only enabled when using ARM RCVT compiler and not when using gcc but I have
not checked everywhere in the code so I'm not sure of this.
Eric
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