Lpc2000

> Looking around at the few code snippetts I was able to find, I noticed
> the use of instructions like:
> 
> ldr rd,=0x12345678
> 
> I cannot find any form of this apparant 32 bit immediate adressing
> mode in the assembly tables. How does it work? Are there limitations?
> 

You are correct, you can not load a 32 bit immediate constant,
regardless of what the code looks like.  But, what you can do is load
a 32 bit constant from a 'literal pool' using PC relative addressing.

So, the compiler generates a block (pool) of constants as it goes
along and actually generates a PC relative load from the pool.

Ordinarily, the compiler would rather calculate the constant in 3
arithmetic operations than use the 'literal pool' so you will see a
lot of address calculation just to get to the VIC.

I imagine it is possible to specify an optimization that will cause
more 'literal pool' operations and less address calculations - perhaps
optimize for size.

Richard