How to figure out the byteorder only with one byte number?

[Tao Jiang]

Hi:

I think I'm clear now.
What's I originally wanted to ask for is whether 'bit order' equals to
'byte order'
And is there a method to find out the 'bit order' then find out the
'byte order' ?

Now I know in the most modern machine there is no difference between BE and LE
at so called 'bit order' level.
Right?

Thank you all.


2012/2/21 Sri Ram Vemulpali <sri.ram.gmu06 at gmail.com>:
> Guys,
>
> I was late to the party. But this whole  discussion throughs me off.
> When you say byte order, it applied when the width of data is more
> than a byte, lets say our width is 4 bytes, a typical word length.
>
> Now how is that there will be byte order on a byte width data. Are you
> talking about nibble order.
>
> When you talk byte order -- either little endian or big endian, we are
> talking how is our data should be interpreted. Depending on order we
> start reading data from left or right a byte at a time.
>
> So, I am confused on your discussions. Please clarify.
>
> Thanks,
> Sri.
>
> On Mon, Feb 20, 2012 at 5:32 PM, THAI NGUYEN <thai-n at rogers.com> wrote:
>>
>> Just as an FYI, way back in the early '90s, Texas Instruments came out with
>> a graphics processor (I believe the TMS340x0 praphics processor) that
>> actually did do the little-ending and big-endian down to the bit level.
>>
>>
>> ________________________________
>> From: Subramaniam Appadodharana <c.a.subramaniam at gmail.com>
>> To: Tao Jiang <jiangtao.jit at gmail.com>
>> Cc: Graeme Russ <graeme.russ at gmail.com>; Bernd Petrovitsch
>> <bernd at petrovitsch.priv.at>; Peter Senna Tschudin <peter.senna at gmail.com>;
>> kernelnewbies at kernelnewbies.org
>> Sent: Monday, February 20, 2012 8:53:10 AM
>> Subject: Re: How to figure out the byteorder only with one byte number?
>>
>> Hi Tao,
>>
>>
>> On Mon, Feb 20, 2012 at 5:25 AM, Tao Jiang <jiangtao.jit at gmail.com> wrote:
>>> Hi:
>>>
>>> Thank you all.
>>>
>>> Take a byte number 0b00000001 for example
>>>                                     ^             ^
>>>                               high bit     low bit
>>>
>>> I used to think in a LE machine it will be stored as 0b10000000 low bit
>>> first
>>>
>>>            ^             ^
>>>
>>>        low bit     high bit
>>>
>>> and in a BE machine will be 0b00000001 high bit first
>>>                                                ^             ^
>>>                                             high bit    low bit
>>>
>>> not only the byteorder is different, but inside a byte is also different.
>>>
>>> But actually they are the same, right?
>> yes they are same. In fact it is termed as 'byte' order not 'bit'
>> order. Hope this helps.
>>> Thank you.
>>>
>>>
>>>
>>> 2012/2/20 Graeme Russ <graeme.russ at gmail.com>:
>>>> On 02/20/2012 01:24 AM, Bernd Petrovitsch wrote:
>>>>> On Sun, 2012-02-19 at 20:08 +0800, Tao Jiang wrote:
>>>>> [...]
>>>>>> Is there some difference of the storge between BE and LE machine inside
>>>>>> a byte?
>>>>>
>>>>> No. At least TTBOMK there exists no such hardware.
>>>>
>>>> Using SHL/SHR would tell you - SHL normally results in a multiply by 2,
>>>> SHR
>>>> a divide by 2. If the byte was little endian, the results would be
>>>> visa-versa
>>>>
>>>> But I agree, I doubt there is any such hardware
>>>>
>>>> Regards,
>>>>
>>>> Graeme
>>>>
>>>
>>> _______________________________________________
>>> Kernelnewbies mailing list
>>> Kernelnewbies at kernelnewbies.org
>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>>
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
>
>
> --
> Regards,
> Sri.