OpenEuphoria

2. Re: Rob: Feature request for next release

• Posted by codepilot Gmail Account <codepilot at gmail.com> Oct 16, 2005
• 1384 views
• Last edited Oct 17, 2005

And maybe log2
built in
FYL2X                         ; D9 F1                [8086,FPU]
Dan

On 10/16/05, Vincent <guest at rapideuphoria.com> wrote:
>
>
> posted by: Vincent <darkvincentdude at yahoo.com>
>
> Rob, can we have some basic bit shifting routines for the next release: s=
hift_left() and shift_right()? It doesnt matter to me if they are implement=
ed internally, machine_proc/func(), or routines in "misc.e"... anything wou=
ld do; they are neccessary.
>
>
> Regards,
> Vincent
>
> ----------------------------------------------
>     ___              __________      ___
>    /__/\            /__________\    |\ _\
>    \::\'\          //::::::::::\\   |'|::|
>     \::\'\        //:::_::::_:::\\  |'|::|
>      \::\'\      //::/  |::|  \::\\ |'|::|
>       \::\'\    //::/   |::|   \::\\|'|::|
>        \::\'\__//::/    |::|    \::\|'|::|
>         \::\','/::/     |::|     \::\\|::|
>          \::\_/::/      |::|      \::\|::|
>           \::,::/       |::|       \:::::|
>            \___/        |__|        \____|
>
>                         .``.
>                         ',,'
>
>
>
>

4. Re: Rob: Feature request for next release

• Posted by Cuvier Christian <christian.cuvier at insee.fr> Oct 17, 2005
• 1393 views

Subject: Re: Rob: Feature request for next release




Vincent wrote:
> 
> Rob, can we have some basic bit shifting routines for the next release:
shift_left()
> and shift_right()? It doesnt matter to me if they are implemented
internally,
> machine_proc/func(), or routines in "misc.e"... anything would do; they
are
> neccessary.
> 
> 
> Regards,
> Vincent

> 
> ----------------------------------------------
> 
>  	                 .``.
> 		         ',,'
> 
> 

Vincent:
  shifting is already available in Euphoria by
  multiplying and dividing  by 2.
  check the library doc.
  see power function
Bernie

My files in archive:
w32engin.ew mixedlib.e eu_engin.e win32eru.exw

Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on
&keywords=bernie+ryan


------------------------------
I'd rather push for rotate() functions that would work on any 32-bit
integers.

Btw, what could be even more useful is to be able to perform elementary
arithmetic on memory locations. For instance, you currently have to type

poke4(a,peek4u(a)+some_value)

Which isn't too good as peek/poke has its overhead. Using call() to do this
is even worse. Rather, an internally built

perform_op(a,PLUS,some_value)

would probably help. Both add some_value at the dword pointed by a.

The needed constants would be:
PLUS
MINUS
MINUS_R  -- for reverse substraction
MUL
DIV --store quotient
DIV_R
AND
OR
XOR

Perhaps adding ROR, ROL,SHL and SHR would be good too.

CChris

6. Re: Rob: Feature request for next release

• Posted by Robert Craig <rds at RapidEuphoria.com> Oct 17, 2005
• 1386 views
• Last edited Oct 18, 2005

Vincent wrote:
> Rob, can we have some basic bit shifting routines for the next release:
> shift_left()
> and shift_right()? It doesnt matter to me if they are implemented internally,
> machine_proc/func(), or routines in "misc.e"... anything would do; they are
> neccessary.

OK, I'll think about it.
I guess it wouldn't hurt to add them to misc.e.
1-bit shifts using multiply and divide by two are very well 
optimized, but I guess a general n-bit shift, written as efficiently
as possible (in Euphoria) might be useful.

Thanks,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com

8. Re: Rob: Feature request for next release

• Posted by Robert Craig <rds at RapidEuphoria.com> Oct 17, 2005
• 1373 views
• Last edited Oct 18, 2005

Juergen Luethje wrote:
> christian cuvier wrote [quoting level corrected]:
> > posted by: Bernie Ryan
> >> Vincent wrote:
> >>> Rob, can we have some basic bit shifting routines for the next release:
> >>> shift_left() and shift_right()? It doesnt matter to me if they are
> >>> implemented internally, machine_proc/func(), or routines in "misc.e"...
> >>> anything would do; they are neccessary.
> >>
> >> Vincent:
> >>   shifting is already available in Euphoria by
> >>   multiplying and dividing  by 2.
> >>   check the library doc.
> >>   see power function
> >> Bernie
> >
> > I'd rather push for rotate() functions that would work on any 32-bit
> > integers.
> 
> You can do this and much more, using <<a
> href="http://rapideuphoria.com/bit.zip">http://rapideuphoria.com/bit.zip</a>>.

I guess I had better look at what you did before I re-invent the wheel.

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com

10. Re: Rob: Feature request for next release

• Posted by "Juergen Luethje" <j.lue at gmx.de> Oct 18, 2005
• 1382 views

Vincent wrote:

> Robert Craig wrote:
>>
>> Juergen Luethje wrote:

[shift and rotate bits]

>>> You can do this and much more, using http://rapideuphoria.com/bit.zip.
>>
>> I guess I had better look at what you did before I re-invent the wheel.
>
> Heh yea, instead maybe you can provide a link to "bit.zip" at the "2.6
> Bitwise Logical Operations" description in the manual, mentioning that
> bit shifting, rotating, etc. routines are available in that lib.
>
> With Juergen Luethje's permission of course .

Rob is free to do with the library what he wants to do.

Regards,
   Juergen

-- 
Have you read a good program lately?