[LLVMdev] IMPLICIT_DEF?

[Jonas Paulsson]

Hi,
 
I have a MachineInstr that writes to a subreg, but clobbers the superreg.
 
How should I BuildMI this instruction?
 
I try to do a 
 
IMPLICIT_DEF super_reg
and then write to a subreg of that super register
 
, but it gets DCE:ed.
 
Is there a way to express this clobbering of a superregister?
 
thanks,
 
Jonas
  		 	   		  
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