Hello everybody,
My assembly being a little rusted, I would like to check with the knowledgeable
people the following portion of code.
...
tst.l d2
beq.s first_place
second_place:
...
Now, if d2 is 0, would executing that code reach
> Hello everybody,
>
> My assembly being a little rusted, I would like to check with the
knowledgeable
> people the following portion of code.
>
>
> ...
> tst.l d2
> beq.s first_place
> second_place:
> ...
>
> Now, if d2 is 0, would execu
> Norman Dunbar wrote:
> > I'm replying to myself - how sad :o)
> Dilwyn Jones replied
> A colleague was having a bad morning today. We knew he was having a
> bad morning, he'd gone beyond talking to himself, he was answering his
> own questions then when someone commented he claimed "that was th
Oh no : your French is very good !
-Message d'origine-
De : TonyTebby [mailto:[EMAIL PROTECTED]]
Envoyé : vendredi 17 janvier 2003 10:20
À : [EMAIL PROTECTED]
Objet : Re: [ql-users] QMON2
(...)
I used to solve a lot of problems this way but, since I moved to France I
have started talking
Morning Jerome,
if D2.L is zero then you will branch to the firts_palce, if not, you'll drop
into second_place.
(Assuming you actually have a first_place in the code somewhere - otherwise,
you'll get an assembly error :o)
Cheers,
Norman.
PS. Can I recommend an excellent series of 'Learn Assembl
You should have heard me last night, I was flat out on the living room floor
with a listing of the 'reg_list' subroutine from QLTDis and a trace listing
of said routine where I had a register dump at the end of every step.
Suffice to say the 'conversation' was 'interesting' - talking to yourself
Joachim Van der Auwera makes some magical things to make me read
} >
} > ...
} > tst.l d2
} > beq.s first_place
} > second_place:
} > ...
} >
} > Now, if d2 is 0, would executing that code reach first_place or
} second_place ?
} > (I have
On 17 Jan 2003, at 9:26, Jerome Grimbert wrote:
> ...
> tst.l d2
> beq.s first_place
> second_place:
> ...
>
> Now, if d2 is 0, would executing that code reach first_place or
> second_place ? (I have my idea, but I do not want to influe
On 17 Jan 2003, at 10:20, TonyTebby wrote:
> I used to solve a lot of problems this way but, since I moved to
> France I have started talking to myself in French. The trouble is, my
> French is so bad I cannot understand myself.
>
Nor can anyone else...
Wolfgang
Tony Tebby wrote:
> I used to solve a lot of problems this way but, since I moved to France I
> have started talking to myself in French. The trouble is, my French is so
> bad I cannot understand myself.
Well, it only gets weird if you start asking others to translate from French
into English...
On Fri, 17 Jan 2003 at 10:20:20, TonyTebby wrote:
(ref: <003001c2be09$cc9512a0$34b2933e@tony>)
>
>
>> Norman Dunbar wrote:
>> > I'm replying to myself - how sad :o)
>> Dilwyn Jones replied
>> A colleague was having a bad morning today. We knew he was having a
>> bad morning, he'd gone beyond tal
Jerome,
Interesting question - and code !
harpo equ $160
chico equ $140
elem_size equ $0c
clr.l a1A1 = 0
moveq.l #4,d2
lea harpo(a1),a1A1 = A1 + $160 = $160
myloop:
adda.w elem_size,a1 A1 = A1 + (5 * $0c) = $19c
> Also, if you do not mind, another (tricker ?) question:
>
> harpo equ $160
> chico equ $140
> elem_size equ $0c
>
> clr.l a1 ; (just to fixe a1 to 0 for the question,
If I remember correctly, you can't do this. You either use "movel.l #0,a1"
(which takes 6 bytes) or better (only 2 b
Jerome Grimbert wrote:
> Also, if you do not mind, another (tricker ?) question:
>
> harpo equ $160
> chico equ $140
> elem_size equ $0c
>
> clr.l a1 ; (just to fixe a1 to 0 for the question,
> ; irrelevant "how to" if illegal)
> ; but once a1
Norman Dunbar wrote:
> lea chico-4*elem_size(a1),a1A1 = $140 - $19c + (4 * $0c)
> = $140 - $1cc
Huh, interesting interpretation of LEA, but I'm afraid your 68k might
disagree ;-)
The address register is the base (i.e. always added),
"chico-4*elem_size" is the offset. And of c
Curses, I have been found out !
I agree that an assembler *should* evaluate expressions properly, but some
don't I'm afraid. QMAC seems to do it, but GWASL (ie the light version)
can't assemble the original code for the lea instruction. I can't remember
if the original GST non-macro assembler did
- Original Message -
From: "Norman Dunbar" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, January 17, 2003 11:30 AM
Subject: RE: [ql-users] Assembly question
Norman, could it be you have some problems with signs???
> Interesting question - and code !
>
> harpo equ $160
> chico
- Original Message -
From: "Marcel Kilgus" <[EMAIL PROTECTED]>
To: "ql-users" <[EMAIL PROTECTED]>
Sent: Friday, January 17, 2003 12:04 PM
Subject: Re: [ql-users] Assembly question
Marcel seems to have less problems with sign, though typing is not his
biggest forte.
> > adda.w el
Hi Joachim,
no I don't have problems with signs, except when trying to determin which
Bcc instructions to use after some singed comparisons :o)
I do, as Marcel kindly pointed out, have problems understanding how the LEA
instruction actually works !
Cheers,
Norman.
-
What, using a computer to solve the puzzle... You cheater :-)
Joachim
P.S. hey, at least I gave the right answer (and fastest too - must be
working really hard at the moment), even if I didn't do the actual hex
calculations. Not that I want to brag about it.
- Original Message -
From: "
Marcel Kilgus wrote:
> Disregarding the bug it's $160 + 5 * $0c + $140 - 4 * $0c
> = $160 + $120 + $0c = $28c.
Speaking to myself (...), there's of course a typo. It's
$160 + $140 + $0c = $2ac
Marcel
> I do, as Marcel kindly pointed out, have problems understanding how the
LEA
> instruction actually works !
It becomes much easier if you have ever had a look at the opcodes. You then
know there is only an offset and nothing to indicate the sign of the data in
the register.
Joachim
Joachim Van der Auwera makes some magical things to make me read
} > Also, if you do not mind, another (tricker ?) question:
} >
} > harpo equ $160
} > chico equ $140
} > elem_size equ $0c
} >
} > clr.l a1 ; (just to fixe a1 to 0 for the question,
}
} If I remember correctly, you can'
Marcel Kilgus makes some magical things to make me read
} Jerome Grimbert wrote:
} > Also, if you do not mind, another (tricker ?) question:
} >
} > harpo equ $160
} > chico equ $140
} > elem_size equ $0c
} >
} > clr.l a1 ; (just to fixe a1 to 0 for the question,
} >
Hi Jerome,
The dbra, stops when the counter is at -1.
So your example executes the loop 5 times with d2 set to 4 then 3 then 2
then 1 then 0 and finally stops.
Cheers,
Norman
-
Norman Dunbar
Database/Unix administrator
Lynx Financial Systems Ltd.
mailto:[EMA
On 17 Jan 2003, at 11:04, Jerome Grimbert wrote:
>
> harpo equ $160
> chico equ $140
> elem_size equ $0c
>
> clr.l a1 ; (just to fixe a1 to 0 for the question,
> ; irrelevant "how to" if illegal)
> ; but once a1 has been modified, we cannot
On 17 Jan 2003, at 12:30, Joachim Van der Auwera wrote:
> Wow, very strong. This is the kind of features that make writing (and
> debugging) assembler "interesting".
>
Yeah, right, next you're gonna suggest we switch to 'C'.
:-)))
Wolfgang
Hi Joachim,
now then, what's wrong with using a tool to get a job done then ?
After all, computers are *supposed* to make life easier for us arn't they ?
Mind you, in Dilwyn's case
Cheers,
Norman.
-
Norman Dunbar
Database/Unix administrator
Lynx Fina
Joachim Van der Auwera wrote:
>> This is probably not the code you wanted. It adds the word at memory
>> address $00c to a1, i.e. a # is missing.
> Wow, very strong. This is the kind of features that make writing (and
> debugging) assembler "interesting".
Only the first few times, after that
-Original Message-
From: Marcel Kilgus [mailto:[EMAIL PROTECTED]]
Sent: Friday, January 17, 2003 2:30 PM
To: ql-users
Subject: Re: [ql-users] Assembly question
>> Marcel (currently looking at and writing 68k assembler about 5 hours a
>> day...)
You have my sympathies then !
Regards,
No
Marcel Kilgus makes some magical things to make me read
}
} More difficult to spots in complex and/or large codes are often things
} like wrong registers. Only 3 days ago I finally fixed a nasty bug that
} lived in the PE for about 12 years. It drew weird windows or crashed
} the machine when the
On Friday, January 17, 2003, at 02:00 AM, Wolfgang Lenerz wrote:
On 17 Jan 2003, at 10:20, TonyTebby wrote:
I used to solve a lot of problems this way but, since I moved to
France I have started talking to myself in French. The trouble is, my
French is so bad I cannot understand myself.
No
Jerome Grimbert wrote:
> I have just found out that blob and mask when used in an information windows
> (How silly, it would be simpler to use a sprite instead!), seems to
> have their origin at the screen origin, not the window origin...
> (whereas sprite are just ok...)
> Is-that the normal beha
[EMAIL PROTECTED] wrote:
>> There will be some more stuff, but that is still on the drawing board.
>> Anyway, I will try to answer any questions anyone might have.
> Send it over please Marcel...
Can do, but mind you this is is still subject to change.
> BTW - have you had any more thoughts on a
- Original Message -
From: "Tony Firshman" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, January 17, 2003 10:19 AM
Subject: Re: [ql-users] QMON2
>
> On Fri, 17 Jan 2003 at 10:20:20, TonyTebby wrote:
> (ref: <003001c2be09$cc9512a0$34b2933e@tony>)
>
> >
> >
> >> Norman Dunbar
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