Re: C compiler supporting arbitrary bit width integral datatypes?

On Thu, 11 Jun 2009 15:21:03 +0100, BjC6rn Franke wrote:


> Jeremy Bennett wrote:
>
>> Or use the language behind the CoWare tools, SystemC, which has a free
>> and open source reference implementation (www.systemc.org). It's a
>> template library for C++ aimed at hardware modeling. Standardized as
>> IEEE 1666, which unusually for the IEEE can be downloaded free.
>
> As far as I know the language behind CoWare's Processor Designer is LISA
> . On Coware's website it says:
>
> "The key to Processor Designer's automation is its Language for
> Instruction Set Architectures, LISA 2.0. In contrast to SystemC, which
> has been developed for efficient specification of systems, LISA 2.0 is a
> processor description language that incorporates all necessary
> processor-specific components such as register files, pipelines, pins,
> memory and caches, and instructions. "


That is true. LISA is used to specify the processor, so this will be
simpler if the OP can obtain the tools and the LISA design philosophy is
suitable for the project. I believe the CoWare tools are now all
integrated, and the simulation models generated will be in SystemC.


> I'm not quite sure how SystemC might help the original poster in
> constructing the compiler targeting arbitrary bit-width integers.


I'd focussed on the simulator part of the question. However, since
SystemC provides a set of types of arbitrary width it will be of general
use in this field.


The OP might like to look at Target Compiler Technologies
(www.retarget.com), who have tools to design ASIPs and generate the
compiler tool chain automatically.


HTH,




Jeremy


>>> ihusar@fit.vutbr.cz wrote:
>>>> Hello everyone,
>>>>
>>>> I am working on a project, where we are trying to make a
>>>> development
>>>> environment for new ASIP processor design. This project, among other
>>>> parts, contains compiler and simulator generator. For these two
>>>> parts, I would need some C compiler, that supports arbitrary
>>>> bit-width integers.
>>>>
>>>> For the simulator, we need to generate code that simulates registers
>>>> of arbitrary bit width and for compiler generator, we would need to
>>>> optimize C code that describes instruction's behavior to extract
>>>> instruction selectrion rule for each instruction,
>>>>

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