llvm dev - Dec 2013 - [LLVMdev] How to build a map between IR Instruction and MachineInstrs?

Hi,
  I try to add a backend (machine function) pass in LLVM 3.3 source code.
In order to analyse precise information of machine instructions, I need some
information of
IR instruction which corresponds to MachineInstrs. If so, it's much easier
to analyse IR Instructions instead of MachineInstrs.
However, in the frame of LLVM 3.3, I can't find the corresponding(connected)
information
from Instruction to MachineInstrs in the CodeGenAndEmitDAG function.
PS: I once used IROrder which is a member of class SDNode as unchangeable
information, but it's roughly corresponding information, so the map
<Instruction*, vector<MachineInstr*> > often overlaps.
Could someone help me with that?
Thank you very much in advance.
-Haishan
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