[LLVMdev] Branch Relaxation Support?

[Dale Johannesen]

On Aug 13, 2009, at 1:08 PMPDT, Evan Cheng wrote:

> ARM has its own pass to do this (ARMConstantIslandPass.cpp). At some
> point of time we'd like to rip out the branch relaxation part and make
> it into a target independent pass.

I don't know about ripping it out, the data structures of the parts  
are pretty much interleaved.  However, on a target without constant  
islands, the constant islands part won't do anything; it should be  
feasible to make the entire pass target independent.  Right now the  
recognition and handling of branch instructions is ARM-specific,  
however.

> Evan
>
> On Aug 13, 2009, at 10:02 AM, Bagel wrote:
>
>> I think I have read that there are plans to generate object code
>> (e.g. ELF)
>> directly in addition to assembly language source.  If so, are there
>> plans to
>> support branch relaxation for targets which support long/short branch
>> displacements?  This is typically done in assemblers.
>>
>> thanks,
>> bagel
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev