[LLVMdev] request for help writing a register allocator

[Susan Horwitz]

I found the problem!  My generated code is spilling correctly but is not 
reloading at all.  For example, if the original code has the equivalent of 
this (where %1024 is a virtual reg):

 	%1024 = xxx
 	...
 	yyy = %1024

and I find no physical register for %1024, then I assign it to physical 
register %edi and to a stackslot.  That creates code like this:

 	%edi = xxx
 	store from %edi to the stack
 	...
 	yyy = %edi

The last instruction is wrong.  There needs to be a load from the 
stackslot into %edi before copying from there into yyy.

The documentation says:
 	If the indirect strategy is used, after all the virtual registers
 	have been mapped to physical registers or stack slots, it is
 	necessary to use a spiller object to place load and store
 	instructions in the code.  Every virtual that has been mapped to a
 	stack slot will be stored to memory after been defined and will be
 	loaded before being used.
But this doesn't seem to be happening; the stores to memory are there but 
the loads are not.

Any ideas what's going wrong?

If not, any advice on how to generate the loads myself??

Susan