[Yhc] Still shrinking YHI for ARM7...question

[Tom Shackell]

Hi Alexis,

Alexis Morris wrote:
> Hi all,
 > So far this all compiles fine, and will fit into ROM but I have yet to
> test it...I would like to figure out what else I can skim...I really 
> want to be able to run it from RAM (64KB) eventually.
> 
> My question at the moment is whether I can remove stuff like pretty.c, 
> and sanity.c (and possibly jonkers) without having a major breakdown of 
> the system.

>     $(VM_DIR)/profile.c \
>     $(VM_DIR)/stable.c \
>     $(VM_DIR)/pretty.c \
>     $(VM_DIR)/sanity.c \
>     $(VM_DIR)/stopcopy.c \

These should be safe to remove, indeed stopcopy isn't used at all.

>     $(VM_DIR)/Concurrent.c \
>     $(VM_DIR)/IORef.c \
>     $(VM_DIR)/PackedString.c \
>     $(VM_DIR)/RuntimeAPI.c \

These should be possible to remove, Concurrent may be a bit more tricky 
(but I think it's all optional).

 >     $(VM_DIR)/Array.c \

It is used in Numeric but you'll probably never used the function that 
uses it (hence you should be able to remove it).

>     $(VM_DIR)/WrapPrimitive.c \

You can remove any definitions made redundant by removing other things.

>     $(VM_DIR)/System.c \

Might be able to trim it down, primExitWith is essential but everything 
else is not.

You might try removing jonkers (and mark) but of course you'll lose 
garbage collection. Since you've only got a small amount of memory and 
Haskell programs allocate memory like crazy I suspect the garbage 
collector is going to be essential.

The other question is how are you loading the bytecode program? In 
standard Yhi it's loaded from the filesystem but I'm guessing the 
embedded processor doesn't have a file system? In which case I guess you 
must load it directly from memory some how. If that's true then you 
might be able to remove some of the loading code (but maybe not, depends 
on how you do it).

After that it starts getting hard to remove much more. Make sure debug 
information is not added and change gcc from "optimise for speed" to 
"optimize for size".

Hope that helps :-)


Tom