Jonas Paulsson jnspaulsson at hotmail.com
Thu Apr 7 06:48:47 PDT 2011

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?
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