[fpc-devel] Patch, font rendering on Arm-Linux devices.

[Christian Iversen]

Daniël Mantione wrote:
> 
> 
> Op Fri, 29 Feb 2008, schreef Christian Iversen:
> 
>>> Instead "unaligned" will simulate an unaligned load with two loads 
>>> and some rotation etc. On the ARM, where every mnemonic can rotate 
>>> operands, this is isn't that bad of a penalty.
>>>
>>> Therefore, I wouldn't be surprised that even on ARM, arrays with 
>>> packed structures are faster than arrays with unpacked structures.
>>
>> That's possible. Why would it be faster, btw? Better cache coherency?
> 
> Like I mentioned, unliek modern x86 processors, ARM processors cannot 
> detect an array traversal and preload the array into the cache. If the 
> array is not in cache, you get cache miss after cache miss.

Unlike modern x86 processors?

Granted, I haven't timed it, but most processors since early P4 models 
are supposed to have "Streaming access detection", which is a fancy way 
of saying array detection.

Are you sure your information is current?

(I could be wrong too, of course)

-- 
Med venlig hilsen
Christian Iversen