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DarkBASIC Professional Discussion / ROL ROR missing?

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Hannibal
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Posted: 24th May 2023 00:06
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It's a pity there's no ROL ROR command that I am aware of
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SoftMotion3D
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Posted: 24th May 2023 01:01 Edited at: 27th May 2023 03:57
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it would be easy to code it but the issue is what type of number system your dealing with. See in assembly rol,ror rely on the state of the processor carry flag depending on what processor your coding with. 6809 is exactly like that. 68000 however does not use the carry and requires roxL roxr to do it properly if i recall. Maybe your thinking of LSL and LSR? These two commands could very easily be programmed in basic as they are simple bit shifts introducing 0's on the ends depending which way your rotating your data. ROL & ROR are kinda useless with basics numbering system.


edit: LSL & LSR

essentially all we are doing here is a division in half or a multiply by 2 for each shift....easy to code in basic.

0100 000 LSR-> 0010 000 64 now equals 32
0100 000 LSL<- 1000 000 64 now equals 128
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Hannibal
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Posted: 24th May 2023 01:12
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I think lsl and lsr are available g=g <<8 kinda ting

I think 68000 does us carry flag for that as I recall

It is really just reintroducing the carried bit in lol and rol
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SoftMotion3D
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Posted: 24th May 2023 01:18
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learning assembly is actually allot of fun.

ya i wasn't sure if you needed the carry bit. may be complicated due to basics numbering system.
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Hannibal
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Posted: 24th May 2023 01:24
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yea would only be used in integer stuff, but should still be quite easy, and if the carry was indicated, would be a dream ! Or, not have a carry flag, but reintroduce the shifted out bit....
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Kevin Picone
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Posted: 4th Jun 2023 05:06
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Here's some functions to do 32bit ROL / ROR




PlayBASIC To HTML5/WEB - Convert PlayBASIC To Machine Code
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Hannibal
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Posted: 7th Jun 2023 23:53
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Cheers Kevin
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