llvm dev - Mar 2010 - [LLVMdev] how to configure llc to generate code for different architecture

Is it possible to configure llc to generate code for other architectures?
For instance, what I need to do to generate Sparc machine code? Thanks.

--Gang
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Hi,

Target architecture for llc can be specified using -march, -mcpu,
-mattr options.

Is it possible to override target CPU attributes when using llvm-gcc compiler?

Regards,
Sergey Y.

I tried llc with -mcpu=help and it dosn't list Sparc. Thanks.

--Gang

On Tue, Mar 16, 2010 at 12:43 PM, Sergey Yakoushkin <
sergey.yakoushkin at gmail.com> wrote:
> Hi,
>
> Target architecture for llc can be specified using -march, -mcpu,
> -mattr options.
>
> Is it possible to override target CPU attributes when using llvm-gcc
> compiler?
>
> Regards,
> Sergey Y.
>
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Hi Sergey,
> Target architecture for llc can be specified using -march, -mcpu,
> -mattr options.
>
> Is it possible to override target CPU attributes when using llvm-gcc
compiler?
only to the extent it is possible to do so with gcc already.  For example,
if gcc is built for x86 you won't be able to squirt out ppc code with it,
but you can target i386, i686, various levels of sse etc.

Ciao,

Duncan.

> Is it possible to override target CPU attributes when using llvm-gcc
compiler?
No. It's a fundamental property of gcc to be compiled separately for
every different target.

Also, the LLVM IR obtained via llvm-gcc (or, more general, derived
from C source) is not target neutral, so in most cases it does not
make any sense to override the target for IR obtained this way.
-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

Reply inlined.



----- Original Message ----
> From: Sergey Yakoushkin <sergey.yakoushkin at gmail.com>
> To: llvmdev at cs.uiuc.edu; Gang-Ryung Uh <guh at boisestate.edu>
> Sent: Tue, March 16, 2010 2:43:08 PM
> Subject: Re: [LLVMdev] how to configure llc to generate code for different
architecture
> 
> Hi,
Hello,

Target architecture for llc can be specified using -march,
> -mcpu,
-mattr options.

Is it possible to override target CPU 
> attributes when using llvm-gcc compiler?
No.  You have to either use Clang or recompile an llvm-gcc cross-compiler for
the architecture you want.

Regards,

--Sam