Limited Memory Micros - was Checking for NAN

[Ralph Hempel <rhempel@...>]

Tom Bates wrote:

> I am using a Microtec C/C++ cross compiler under Windows for a Motorola
> 68331 processor. I am currently working on porting Lua to a very limited
> embedded platform that does not support floating point in hardware, so I
> have built Lua using longs as Lua numbers. In this environment then, it
> strikes me that the compiler is correct, and this code will not be
> generated, which is fine.

Man, I can remember using that compiler 10 or so years ago...I just
did a quick search and it looks like Mentor Graphics picked them up.

> But for now, I just need to get the port working. At the moment, the
> interpreter does not build correct code from source, but the engine does
> execute compiled code correctly.

I'm doing something similar, but with an ARM processor. And I
have the same problem as you (maybe). I'm using longs instead
of float or double too.

I can define one-line functions (within the input buffer limit)
and I can type single line input, but if I feed the bare bones
interpreter a multi-line function, it chokes somewhere in the
middle of parsing the function.

I'm narrowing down the search bit by bit, and my next step is
having a look at my realloc() function.

This is 5.1.1 by the way, and I also plan to go back and test
with the 5.0.3 code to see if there's a difference.

I only have 64 K of RAM to work with, but lots of FLASH for the
C code. The applications that will be written are pretty small,
so I don't need support for huge arryas etc.

Ralph