llvm dev - Nov 2013 - [LLVMdev] How to determine the a use reference is the last reference of a virtual Register through current path

Hello llvmers:
      I'm study    Fast register allocation in codegen.   I get confused
with  isKill flag in MachineOperand.  I thin "isKill Because Fast Register
doesn't require  LiveVariable Analysis , So during Fast RegisterAllocation, 
the Allocation procedure can't determine if this use reference is the last
use ( isKill flag is missed for global  Virtual register without pre-pass of
LiveVariable analysis );

So, How  does Fast RegisterAllocation resolve such problem ?



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