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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] 68030 and movem
- From: Andreas Grabher <andreas_g86@xxxxxxxxxx>
- Date: Mon, 18 Sep 2023 10:46:34 +0200
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> Am 18.09.2023 um 10:16 schrieb Nicolas Pomarède <npomarede@xxxxxxxxxxxx>:
>
> Le 18/09/2023 à 10:05, Andreas Grabher a écrit :
>>>> Am 17.09.2023 um 12:16 schrieb Andreas Grabher <andreas_g86@xxxxxxxxxx>:
>>>
>>>
>>>> Am 17.09.2023 um 12:08 schrieb Thorsten Otto <admin@xxxxxxxxxxx>:
>>>>
>>>>
>>>>
>>>> On Sonntag, 17. September 2023 11:37:38 CEST Andreas Grabher wrote:
>>>>
>>>> > It might as well mean size of one single transfer, which might be word or
>>>>
>>>> > long.
>>>>
>>>>
>>>> Yes, this is actually the case. See https://www.atari-forum.com/viewtopic.php?p=451165#p451165 <https://www.atari-forum.com/viewtopic.php?p=451165#p451165> in answer from agranlund, where i also wondered about which size was meant.
>>>>
>>>
>>> Thank you! Then please ignore my first patch.
>> From my point of view the patch that was added yesterday to the repository adds unnecessary overhead to variants of MOVEM that are not affected by the special case.
>
> Hi
>
> these are the changes from WinUAE :
>
> https://github.com/tonioni/WinUAE/commit/fe444426bf01e1be0523c391aaf1e34bf8758430
>
> do you mean the ones that use "int predec = 0;" ? If so they should be optimized by the compiler.
>
> Nicolas
>
That is likely. But why do we add code just to optimize it away afterwards? At least it is bad for readability.