llvm dev - Mar 2009 - [LLVMdev] Why llvm-gcc/g++ does not support the 64-bit SPARC ABI (-m64)

My application is 64bit running on Solaris 10 with Sparc. I'd like to
use llvm-gcc/g++ to compile it to make it run faster. But in the Release
Notes of the latest LLVM release, it says

Known problems with the SPARC back-end

* The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does
not support the 64-bit SPARC ABI (-m64).

Why it doesn't support 64bit on sparc?

Thanks!

 

Cathy Guo

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At guess, because nobody has implemented it yet.  Patches welcome!

-Owen

Sent from my iPhone

On Mar 12, 2009, at 9:59 AM, Cathy Guo <CGuo at ibasis.net> wrote:
> My application is 64bit running on Solaris 10 with Sparc. I'd like  
> to use llvm-gcc/g++ to compile it to make it run faster. But in the  
> Release Notes of the latest LLVM release, it says
>
> Known problems with the SPARC back-end
>
> * The SPARC backend only supports the 32-bit SPARC ABI (-m32); it  
> does not support the 64-bit SPARC ABI (-m64).
>
> Why it doesn't support 64bit on sparc?
>
> Thanks!
>
>
>
> Cathy Guo
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Hello, Cathy
> Why it doesn't support 64bit on sparc?
It's a bit hard to answer on such questions... But probably the right  
answer is: nobody cared about it, sorry.
Also, as far as I remember, 32 bit code is also not always ABI- 
compliant.

---
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

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Anton Korobeynikov wrote:
> Hello, Cathy
> 
>> Why it doesn't support 64bit on sparc?
> It's a bit hard to answer on such questions... But probably the right 
> answer is: nobody cared about it, sorry.
> Also, as far as I remember, 32 bit code is also not always ABI-compliant.
As far as I know, llvm-gcc won't build properly for the sparc target due 
to some unimplemented floating point stuff, so you can't really produce 
ABI compatible stuff. There is also some sort of issue with exception 
support which is not something actually know anything about.

Luke
> 
> ---
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
> 
> 
> ------------------------------------------------------------------------
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