[llvm-dev] LLVM Backend for a platform with no (normal) stack

[JD Jones via llvm-dev]

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


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