Subject:
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Re: Further Adventures with Assembler
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Tue, 27 Jan 2004 05:10:30 GMT
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Viewed:
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4032 times
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In lugnet.robotics.rcx.legos, Michael Purvis wrote:
> In the middle of an assember block, there's an instruction that moves a value
> from an array into a register:
>
> mov.b @(_myglobalarray, r3), r5
The line above should produce an error because you are specifying a byte move
into a word register. The fact that it doesn't always cause an error makes me
think there's something flakey (in the assembler) in the way instruction operand
sizes are being parsed. Replace the line with one of the following valid lines
(your pick):
mov.w @(_myglobalarray, r3), r5
mov.b @(_myglobalarray, r3), r5l
mov.b @(_myglobalarray, r3), r5h
BTW, I tend not to use the instruction width modifier ".b" or ".w" when I write
assembly since it is redundant. The source or target register already implies
the size of the operation to perform. The result is less typing and less
cluttered looking code (IMO).
Mark
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Message has 1 Reply:
 | | Re: Further Adventures with Assembler
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| (...) Yeah... that was me being stupid. The types are all correct in the program. I tried compiling without the .b and .w's, just to be sure and it's the same error. The arrays that cause the problem are of type const char. There's three that have (...) (20 years ago, 27-Jan-04, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Further Adventures with Assembler
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| Just wanted to thank everyone again for the help on assembler. I've been very successful and managed to greatly increase the speed of a critical portion of my program. However, I'm still having a very bizarre issue: In the middle of an assember (...) (20 years ago, 27-Jan-04, to lugnet.robotics.rcx.legos)
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