llvm dev - Apr 2012 - [LLVMdev] Spilling in Register allocator.

Hi,

I am currently working on a simple graph coloring based register allocator
on llvm.

So far my code builds the interference graph and assigns physical registers
using the VirtRegMap. However I am facing some trouble while spilling.



I used *assignVirt2StackSlot* method of VirtRegMap and got “UNREACHABLE
EXECUTED” error.



I would like to know if simply calling this method is enough to spill the
register or whether I need to explicitly assign memory location. Also I do
not understand how the spiller object is to be used.


Any help regarding this would be appreciated.

Thanks.
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