[fpc-devel] Patch, font rendering on Arm-Linux devices.
chrivers at iversen-net.dk
Fri Feb 29 17:08:56 CET 2008
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
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