[LLVMdev] Data Dependence Graph

[Tanya Lattner]

> Is it possible to generate a data dependence graph of llvm assembly file?
> How can I get the data flow information in X.ll file? Also, in .ll file I
> see everyline ends with something like this:
> <type> [#uses=3]
> What is the significance of this and is it used anyway by the compiler for
> data dependence analysis.

There is no general framework at the moment. I wrote some basic data 
dependence analysis stuff for my research with software pipelining, but 
unfortunately its somewhat Sparc specific at the moment. You can take a 
look at:

lib/Target/SparcV9/ModuloScheduling/MSchedGraph.h
lib/Target/SparcV9/ModuloScheduling/MSchedGraph.cpp
lib/Target/SparcV9/ModuloScheduling/DependenceAnalyzer.cpp
lib/Target/SparcV9/ModuloScheduling/DependenceAnalyzer.h

Eventually it should be target independent, but some additional pieces to 
the puzzle need to fall in place first.

-Tanya