llvm dev - Dec 2018 - LLVM Backend for a platform with no (normal) stack

Dear Sir or Ma'am;

 

I have found a wealth of help and information on writing an LLVM backend.
And, my platform has no stack.

 

Can you point me to any information that would specifically address creating
a backend for this kind of platform?

 

In previous wanderings, I thought I ran across a phrase "platforms with no
stack such as FPGAs", but I can't find that mention, now.

 

More thanks than I can type,

JD Jones

Software Engineer


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Do you have a register that you can store a memory address in and an
addressing mode that allows you to add (or subtract) a constant to that
register and use the address calculated to load//store from memory? Do you
have enough registers that you can keep one of them permanently pointed to
a particular memory region?

If yes, then you have a stack to exactly the same extent as RISC-V or MIPS
do.

On Thu, Dec 13, 2018 at 12:53 PM JD Jones via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Dear Sir or Ma’am;
>
>
>
> I have found a wealth of help and information on writing an LLVM backend.
> And, my platform has no stack.
>
>
>
> Can you point me to any information that would specifically address
> creating a backend for this kind of platform?
>
>
>
> In previous wanderings, I thought I ran across a phrase “platforms with no
> stack such as FPGAs”, but I can’t find that mention, now.
>
>
>
> More thanks than I can type,
>
> JD Jones
>
> Software Engineer
>
> This message is intended for the addressee only and may contain Paragon
> Research Corporation (PRC) confidential or privileged information.  Use or
> distribution of such confidential information is strictly prohibited
> without the prior written permission of PRC.  If you have received this
> message in error, please contact the sender immediately and delete the
> message and attachments from your computer.
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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Thanks for your response.  Please see below.

 

From: Bruce Hoult [mailto:brucehoult at sifive.com] 
Sent: Thursday, December 13, 2018 5:58 PM
To: jjones at prc-hsv.com
Cc: LLVM Developers Mailing List <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] LLVM Backend for a platform with no (normal) stack

 

Do you have a register that you can store a memory address
>> yes
 

in and an addressing mode that allows you to add (or subtract) a constant to
that register
>> Sometimes
 

and use the address calculated to load//store from memory? Do you have enough
registers that you can keep one of them permanently pointed to a particular
memory region?
>> No
 

The platform intentionally does not allow use of some large chunk of memory for
shared use by function calls.  I can allocate memory (so long as I know the
necessary size before-hand). I can work around this issue, but if someone has
already addressed it, I’d like to learn from their experiences before rolling my
own.

 

If yes, then you have a stack to exactly the same extent as RISC-V or MIPS do.

 

On Thu, Dec 13, 2018 at 12:53 PM JD Jones via llvm-dev <llvm-dev at
lists.llvm.org <mailto:llvm-dev at lists.llvm.org> > wrote:

Dear Sir or Ma’am;

 

I have found a wealth of help and information on writing an LLVM backend. And,
my platform has no stack.

 

Can you point me to any information that would specifically address creating a
backend for this kind of platform?

 

In previous wanderings, I thought I ran across a phrase “platforms with no stack
such as FPGAs”, but I can’t find that mention, now.

 

More thanks than I can type,

JD Jones

Software Engineer


This message is intended for the addressee only and may contain Paragon Research
Corporation (PRC) confidential or privileged information.  Use or distribution
of such confidential information is strictly prohibited without the prior
written permission of PRC.  If you have received this message in error, please
contact the sender immediately and delete the message and attachments from your
computer._______________________________________________
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llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org> 
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