Rocksolid Light - comp.arch - Re: Load/Store with auto-increment

Re: Load/Store with auto-increment

<2023May11.165813@mips.complang.tuwien.ac.at>

https://news.novabbs.org/devel/article-flat.php?id=32160&group=comp.arch#32160

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From: anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups: comp.arch
Subject: Re: Load/Store with auto-increment
Date: Thu, 11 May 2023 14:58:13 GMT
Organization: Institut fuer Computersprachen, Technische Universitaet Wien
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by: Anton Ertl - Thu, 11 May 2023 14:58 UTC

BGB <cr88192@gmail.com> writes:
>On 5/9/2023 1:26 PM, Scott Lurndal wrote:
>> BGB <cr88192@gmail.com> writes:
>>> There is no straightforward mapping between UTF-8 bytes and the logical
>>> X position of a cursor on screen.
>>
>> Why should there be a straighforward mapping? The cursor is an
>> abstract object which represents the location of character cell on the
>> screen, not a glyph in a UTF-8 stream.
>>
>
>If we know, say, that it is at column 30, and each cell is 8 pixels wide:
> Its X offset is 30*8

But UTF-32 does not give you "column 30" in any straightforward way,
either. You still have to inspect every code point from the start of
the line to the current position.

- anton
--
'Anyone trying for "industrial quality" ISA should avoid undefined behavior.'
Mitch Alsup, <c17fcd89-f024-40e7-a594-88a85ac10d20o@googlegroups.com>

Re: Load/Store with auto-increment

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https://news.novabbs.org/devel/article-flat.php?id=32163&group=comp.arch#32163

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From: cr88192@gmail.com (BGB)
Newsgroups: comp.arch
Subject: Re: Load/Store with auto-increment
Date: Thu, 11 May 2023 11:46:39 -0500
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by: BGB - Thu, 11 May 2023 16:46 UTC

On 5/11/2023 9:58 AM, Anton Ertl wrote:
> BGB <cr88192@gmail.com> writes:
>> On 5/9/2023 1:26 PM, Scott Lurndal wrote:
>>> BGB <cr88192@gmail.com> writes:
>>>> There is no straightforward mapping between UTF-8 bytes and the logical
>>>> X position of a cursor on screen.
>>>
>>> Why should there be a straighforward mapping? The cursor is an
>>> abstract object which represents the location of character cell on the
>>> screen, not a glyph in a UTF-8 stream.
>>>
>>
>> If we know, say, that it is at column 30, and each cell is 8 pixels wide:
>> Its X offset is 30*8
>
> But UTF-32 does not give you "column 30" in any straightforward way,
> either. You still have to inspect every code point from the start of
> the line to the current position.
>

As noted, I was arguing for a text editor using character cells, not UTF-32.

> - anton

Backed up the system lately?

devel / comp.arch / Re: Load/Store with auto-increment

Subject	Author
Re: Load/Store with auto-increment	Anton Ertl
Re: Load/Store with auto-increment	BGB