llvm dev - Jan 2009 - [LLVMdev] hi, llvm-gcc deal with va_arg() by word alignment.

hi, 
     I am porting llvm to our embedded cpu.
By my abi, long long type is aligned by 8 bytes.
But now llvm-gcc frontend follows x86 abi, generate 
word-alignment LLVM-IR for va_arg().

   In some degree, llvm-gcc frontend depends on targets.
The best solution is llvm-gcc can create va_arg node, 
I can lower it at the backend.

   Who can give a temporary solution to make frontend can 
create 8 byte alignment code for long long type?

Thanks

    renkun.



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Is your llvm-gcc frontend targeting x86? It does not generate target  
neutral bitcode.

Evan

On Jan 4, 2009, at 3:11 AM, 任坤 wrote:
> hi,
>      I am porting llvm to our embedded cpu.
> By my abi, long long type is aligned by 8 bytes.
> But now llvm-gcc frontend follows x86 abi, generate
> word-alignment LLVM-IR for va_arg().
>
>    In some degree, llvm-gcc frontend depends on targets.
> The best solution is llvm-gcc can create va_arg node,
> I can lower it at the backend.
>
>    Who can give a temporary solution to make frontend can
> create 8 byte alignment code for long long type?
>
> Thanks
>
>     renkun.
>
> 好玩贺卡等你发，邮箱贺卡全新上线！ 
> _______________________________________________
> 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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Hi,
>      I am porting llvm to our embedded cpu.
> By my abi, long long type is aligned by 8 bytes.
> But now llvm-gcc frontend follows x86 abi, generate 
> word-alignment LLVM-IR for va_arg().
if llvm-gcc thinks the alignment is 4 but it is not then you
will get more problems than just with va_arg.  Why not teach
llvm-gcc about your target?

Ciao,

Duncan.