llvm dev - Aug 2015 - Configuring LLVM Sparc target for Leon 3 and Leon 4 variants

At the moment I am using LLVM to target our proprietary SHAVE processor, but
the Movidius "Myriad" chip also utilises a Sparc Leon for executive
functions.  For this I use the GCC compiler.

 

This all works fine, but I would like to consolidate code generation for
both targets in the same LLVM derived compiler to simplify things and I have
a couple of questions about the Sparc backend in LLVM I was wondering if
someone could help me with.

 

.         It is not 100% clear to me that the existing backend fully
supports the Sparc V8 architecture, and the Leon variants in particular.
Does anyone know whether this architecture is supported in the Sparc
backend?

.         How easy is it to configure the existing Sparc back-end for
bi-endian code generation?

 

Thanks,

 

            MartinO

 

Martin J. O'Riordan                Email:  Martin.ORiordan at movidius.com

Compiler Development               Web:    www.movidius.com
<http://www.movidius.com/> 

Movidius Ltd.                      Skype:  moviMartinO

1st Floor,  O'Connell Bridge House,  d'Olier Street,  Dublin 2, Ireland

 

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>
>
>
> ·         It is not 100% clear to me that the existing backend fully
> supports the Sparc V8 architecture, and the Leon variants in particular.
> Does anyone know whether this architecture is supported in the Sparc
> backend?
>
Full support for v8,v8+ looks like it's getting close.  Nothing
Leon-specific, but a few folks seem to be adding missing instructions
occasionally.
> ·         How easy is it to configure the existing Sparc back-end for
> bi-endian code generation?
>
It can already do that.

Doug
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Thanks very much Doug, that is really useful information.  If it’s that close I
should be able to wade in and help out in completing it.

 

            MartinO

 

From: Douglas Katzman [mailto:dougk at google.com] 
Sent: 27 August 2015 15:10
To: Martin J. O'Riordan
Cc: LLVM Developers
Subject: Re: [llvm-dev] Configuring LLVM Sparc target for Leon 3 and Leon 4
variants

 

 ·         It is not 100% clear to me that the existing backend fully supports
the Sparc V8 architecture, and the Leon variants in particular.  Does anyone
know whether this architecture is supported in the Sparc backend?

Full support for v8,v8+ looks like it's getting close.  Nothing
Leon-specific, but a few folks seem to be adding missing instructions
occasionally.

·         How easy is it to configure the existing Sparc back-end for bi-endian
code generation?

It can already do that.

 

Doug

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