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The carry flag   Message List  
Reply | Forward Message #13885 of 15019 |
Re: [gbadev] Re: The carry flag

On Wednesday 02 April 2003 18:58, Eddie Edwards wrote:
> > you completely missed my point. i was pointing out the problem with
> > operating the carry bit in this manner.
>
> You haven't pointed out any problem at all. What *is* the problem with
> operating the carry bit in this manner?
>
> If there's a genuine problem with the ARM architecture that has somehow
> gone unnoticed for 15 years I'd like to know what it is.

maybe an old speccy owner that still cant resist any 6502-ish behaviour no
matter what? :o)

gpz




Thu Apr 3, 2003 1:28 am

groepaz2000
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Message #13885 of 15019 |
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Hi Jay, ... Both correct. CMP is *exactly* just SUBS without a destination register. ... <=> BCC. ... Well you should avoid BCC/BCS except (a) after ADD and...
Eddie Edwards
eddie@...
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Apr 3, 2003
1:27 pm

... maybe an old speccy owner that still cant resist any 6502-ish behaviour no matter what? :o) gpz...
Groepaz
groepaz2000
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Apr 3, 2003
2:17 am

... yes, I was taking about the old 6502 (history of the Arm being the replacement for the 6502 in acorn computers) (still it was sbc without the sub etc etc)....
Mike Wynn
mike.wynn@...
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Apr 2, 2003
2:43 am

of course this might very well be purely academic, but the result is still incorrect regardless of how you turn it. ((0-0)+0+(c)) should never result in 1. as...
Morten Pedersen
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Apr 2, 2003
11:36 pm

... Academically, does Peano arithmetic define 'c'? What's incorrect academically is to use the carry flag for anything other than carrying from less...
Damian Yerrick
yerricde
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Apr 2, 2003
11:54 pm

... This really perplexed me so I tried it out myself as a sanity check. I was unable to reproduce this behaviour either in VBA or on the hardware. ?!?...
Chris Hayton
you_oughta_b...
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Apr 3, 2003
2:16 am

i cant reproduce it either so i probably forgot the s bit or something anyway, cheers all ... From: "Chris Hayton" <chayton@...> To:...
Morten Pedersen
escapekey@...
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Apr 3, 2003
9:36 am
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