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!

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On Thu, Mar 12, 2009 at 12:14 PM, 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?
>
I believe it's because no-one has bothered to implement it. :-) Few of
us have Sparc machines to develop and test on. If you're willing to
give it a try, we would appreciate any patches you may have!

-bw