[Icc-avr] Casting

[Albert vanVeen]

Some compilers have operators like "high()" and "low()", which makes it
clear to the compiler (and to the reader) that that is exactly the
simple thing that you want: just use the appropriate address and no
superfluous instructions.
 
Albert.


-----Original Message-----
From: icc-avr-bounces at imagecraft.com
[mailto:icc-avr-bounces at imagecraft.com] On Behalf Of Johannes Assenbaum
Sent: Tuesday, January 15, 2008 08:41 AM
To: icc-avr at imagecraft.com
Subject: Re: [Icc-avr] Casting

As someone mentioned before, this is only safe for Little Endian, but as
AVRs are Little Endian, there will be no problem with iccavr.

Btw: Shortest code (no optimisation enabled) will be with source value
casted.

Data[7] = ((unsigned int)(Channel_One) >> 8); Data[8] = ((unsigned
int)(Channel_One));

Best regards,
Johannes


>> Andrew wrote:
>>> Hi,
>>>
>>> When casting and int to two char' (a MSB and LSB) is it safe to do 
>>> the
>>> following:-
>>> Data[7] = (Channel_One >> 8);
>>> Data[8] = (Channel_One);
>>>

> I always use the above solution, it should be perfectly legal and it 
> has never failed me on any compiler. I think it is quite clear for any

> programmer of embedded systems what this does.

> regards
> Johan


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