[fpc-devel] Re: closing of bug 5042 or general unalignment problems with arm compiler

[Roozbeh GHolizadeh]

>Hello,

>What exactly are those exceptions of Misalligned data
access on windows CE?

>And why that doesn´t exist on x86 architecture?

>thanks,

Those are something like access violation exceptions
in  x86,when for example you try to read/write to nil
pointer region.
With ms embeded visual c-only v4.0-we can handle those
with try/catch(i think we cant in fpc),and accur when
you access unaligned memory addresses.
I dont know why we dont have them on x86,but i know
for x86 it is also difiicult to handle,and internally
it handles them aligned and do conversions.
maybe becouse in arm implementing and accessing them
makes it slow.
I also read an article which said on ia64 it is also
problem,and windows generate error for accessing
unaligned data as it is very slow.

regards

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