llvm dev - Aug 2009 - [LLVMdev] Register Allocation

Hi,

I'm currently working on a register allocation problem. Therefore, I 
want to reduce the number of available registers of the ARM by a large 
amount to see the impact on the assembly code. I tried to change the 
number via the ARMRegisterInfo.td by stripping the registerClasses (like 
it is described in the Code generator docs), but the resulting code is 
unchanged.
Is there an easy alternative using the registerscavening.cpp directly or 
did I miss out something?

On Aug 13, 2009, at 7:28 AM, Christian Scheuer wrote:
> Hi,
>
> I'm currently working on a register allocation problem. Therefore, I
> want to reduce the number of available registers of the ARM by a large
> amount to see the impact on the assembly code. I tried to change the
> number via the ARMRegisterInfo.td by stripping the registerClasses  
> (like
> it is described in the Code generator docs), but the resulting code is
> unchanged.
If you removed the registers from the GPR register files that will  
ensure those registers are not used. Are you sure you have rebuilt llc  
and you are testing it right? Perhaps your test doesn't need many  
registers?

Evan

> Is there an easy alternative using the registerscavening.cpp  
> directly or
> did I miss out something?
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