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

Christian Iversen chrivers at iversen-net.dk
Fri Feb 29 17:08:56 CET 2008

Daniƫl 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

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