[LLVMdev] def use at O0

[zeng jane]

Hi all
    I would like to have access to def-use relationships at O0 , for now
after register allocation. So my question is

1.  is there any such existing information ? If not, do i need to build it
from scratch by traversing all the instructions and operands ?

2. While for now I only need it Post RA but eventually I want to use it
before RA as well. Suggestions on how i can go abt that would help me reuse
code/def-use data would be great !

thanks for all help !
zeng
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