[LLVMdev] C embedded extensions and LLVM

[Alireza.Moshtaghi at microchip.com]

Christopher,

Thank you for all the work :-)

Regarding the regression testing, it is in our plan to contribute into
LLVM. The current state of our project is not in the form that we can do
this at this time though, but I'm hoping that we can get some minimal
functionality into LLVM before LLVM 2.3 (at most LLVM 2.4) release.

Looks like you have also (at least on your local project) taken care of
the front-end. We are currently working on normal address space, but
probably in the next month we will start working on the support for rom
access. So the front-end modifications are not necessary right away but
it'd be nice to have them before that time. 

In the mean time, I will take a look and try to understand your
modifications, and I'm sure that I'll be back with some questions.

 

Regards

A.

________________________________

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
On Behalf Of Christopher Lamb
Sent: Wednesday, January 30, 2008 10:59 PM
To: LLVM Developers Mailing List
Subject: Re: [LLVMdev] C embedded extensions and LLVM

 

Alireza, 

 

I have added full support for embedded C address spaces to the LLVM IR
(see http://llvm.org/docs/LangRef.html#t_pointer). I have not added any
support for the fractional types and their operators, though I think
this would simply require adding the necessary intrinsics, which is one
of the easier things to add to LLVM. Given that LLVM takes the approach
of modeling these kinds of type differences as differing operations
rather than different types in it's type system it should be fairly
straight forward to add them if needed.

 

As far as front-end support goes, I do have changes to my local clang
tree which add attributes for address spaces which have been working for
my purposes. However since my initial work my free time has become more
scarce and I haven't had the opportunity to clean up the patches and
submit them back to the tree. 

 

The lack of a public back end with which to consume the generated IR
with embedded C extensions and validate the front end is also a problem.
Without such a platform it will be difficult for the LLVM project to
guarantee that the functionality stays working going forward.

 

Do you mind sharing more details about your project, particularly how
soon you need the front end support and if you would be able to provide
a way (ideally contributed back to LLVM) to regress these features going
forward?

 

--

Christopher Lamb

 

On Jan 30, 2008, at 9:53 AM, <Alireza.Moshtaghi at microchip.com>
<Alireza.Moshtaghi at microchip.com> wrote:





Thank you Chris,

That is great news...

So his modifications are in llvm-2.2?

How has Christopher tested them? Are there attributes or intrinsics that

I can also use?

 

A. 

 

-----Original Message-----

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]

On Behalf Of Chris Lattner

Sent: Tuesday, January 29, 2008 9:23 PM

To: LLVM Developers Mailing List

Subject: Re: [LLVMdev] C embedded extensions and LLVM

 

On Jan 29, 2008, at 9:56 AM, <Alireza.Moshtaghi at microchip.com>

<Alireza.Moshtaghi at microchip.com 

	wrote:

	Christopher,

	It has been a while since we last talked about C embedded
extensions  

	in

	LLVM, I was moving back and froth from project to project and
didn't  

	get

	a chance to follow up. I was wondering if you have made any
changes to

	LLVM IR and if so what has been added. And how can I contribute?

 

My understanding is that Christopher's patches have all landed in  

llvm, so the IR is capable of capturing and propagating the address  

space information.  However, we have no front-end that correctly  

generates this.  My understanding is that Christopher has patches in  

progress to add this to clang, but I'm not sure what the state of  

these is.  It would be great to get have help getting this into clang.

 

-Chris

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