porting GCC to a micro with a very limited addressing mode --- what to write in LEGITIMATE_ADDRESS, LEGITIMIZE_ADDRESS and micro.md ?!

[Gabriel Paubert]

On Mon, Jan 25, 2010 at 01:34:09PM +0100, Sergio Ruocco wrote:
> 
> Hi everyone,
> 
> I am porting GCC to a custom 16-bit microcontroller with very limited
> addressing modes. Basically, it can only load/store using a (general
> purpose) register as the address, without any offset:
> 
> 	LOAD (R2) R1	; load R1 from memory at address (R2)
> 	STORE R1 (R2)	; store R1 to memory at address (R2)
> 
> As far as I can understand, this is more limited than the current
> architectures supported by GCC that I found in the current gcc/config/*.

The Itanium (ia64) has the same limited choice of addressing modes. 

	Gabriel