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      /  Amiga Inc. Loses U.S. Trademarks
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PosterThread
michalsc 
Re: Cloanto acquire Amiga Inc Trademark
Posted on 19-Apr-2021 18:02:45
#1 ]
AROS Core Developer
Joined: 14-Jun-2005
Posts: 377
From: Germany

@ppcamiga1

Quote:
In real life 32 bit constans in compiled C code,
are stored with arm instructions in little endian format.


In real Amiga life there is no ARM code used yet and so there is no issue with any constants. Regarding ARM code on ARM machines - no, even constants stored between instructions are big endian if the CPU is running in big endian and the code was compiled for big endian ARM. It is instruction decoder which fetches opcodes in LE, so really only arm code is affected. The rest, including FPU unit, operates in BE if the CPU is told to do so. Well, even MMU page tables are big endian in that case.

Quote:

After setend bi, they have wrong values.


Sure, if one is mixing endianness in that way, then very bad things can happen. Therefore such easy endian switching was made obsolete on ARM.

Quote:

which makes arm useless for amiga os.


Not if ARM is running in big endian mode all the time.

Last edited by michalsc on 19-Apr-2021 at 06:03 PM.

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Replies
SubjectPosterDate
      Re: Cloanto acquire Amiga Inc Trademarkppcamiga119-Apr-2021 19:30:13
          Re: Cloanto acquire Amiga Inc Trademarkmichalsc19-Apr-2021 19:52:11
              Re: Cloanto acquire Amiga Inc Trademarkppcamiga120-Apr-2021 7:44:38
                  Re: Cloanto acquire Amiga Inc Trademarkmichalsc20-Apr-2021 8:07:23
                      Re: Cloanto acquire Amiga Inc Trademarkppcamiga120-Apr-2021 13:01:47
                          Re: Cloanto acquire Amiga Inc Trademarkmichalsc20-Apr-2021 13:54:43
                              Re: Cloanto acquire Amiga Inc Trademarkppcamiga121-Apr-2021 7:55:24
                                  Re: Cloanto acquire Amiga Inc Trademarkmichalsc21-Apr-2021 8:52:24
                                      Re: Cloanto acquire Amiga Inc Trademarkppcamiga122-Apr-2021 8:40:39
                                          Re: Cloanto acquire Amiga Inc Trademarkmichalsc22-Apr-2021 9:01:47
                                              Re: Cloanto acquire Amiga Inc Trademarkppcamiga122-Apr-2021 16:12:52
                                                  Re: Cloanto acquire Amiga Inc Trademarkmichalsc22-Apr-2021 16:50:56
                                                  Re: Cloanto acquire Amiga Inc TrademarkCheese22-Apr-2021 21:23:36
          Re: Cloanto acquire Amiga Inc Trademarkkolla22-Apr-2021 23:23:31



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