Re: New Linux 4word

Terry Loveall <[email protected]> Fri, 8 Apr 2005 17:08:33 -0700

Newsgroups	gmane.comp.lang.forth.colorforth
Message-ID	<[email protected]>

On Fri, 8 Apr 2005 11:57:41 +0200
[email protected] (Albert van der Horst) wrote:
> An assembler is the proper starting point. There is no Metacompiler
> without assembler. And an assembler may be enough.
> Unless of course you think you have a nice source if it is sprinkled
> with
>         cd45 2,      12 1, 3135 2,

While porting 4word to linux I encountered the above problem of inline
opcode compilation without comments. Had to go back and decode the 16-bit mode
opcodes and translate them into 32-bit mode opcodes.

Rather than putting together a sub-set of an assembler I just commented the
new inline opcodes with their intel mneumonics. Maximum efficiency of size and
readability.

Old 16-bit definition:
macro : 2*    [ $ e0d166 L ] 3, ] ;

New 32-bit definition:
macro : 2*    [ $ e0d1 L ( shl eax,1) ] w, ] ;

The really tough discipline is keeping the comments up to date...

Regards,
Terry Loveall