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Re: porting GCC to a micro with a very limited addressing mode --- what to write in LEGITIMATE_ADDRESS, LEGITIMIZE_ADDRESS and micro.md ?!
- From: Gabriel Paubert <paubert at iram dot es>
- To: Sergio Ruocco <sergio dot ruocco at gmail dot com>
- Cc: GCC <gcc at gcc dot gnu dot org>
- Date: Mon, 25 Jan 2010 16:24:24 +0100
- Subject: Re: porting GCC to a micro with a very limited addressing mode --- what to write in LEGITIMATE_ADDRESS, LEGITIMIZE_ADDRESS and micro.md ?!
- References: <4B5D8FC1.60205@gmail.com>
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