Dear tree-ssa developers:
     I am now analyzing the source code  of the the
branch, I focus on the transformation from AST to CFG.
For I am working on program slicing of c/c++. I know
the tree-ssa branch has done the transformation from
AST to CFG.While before the transformation, the tree
has been simplified .Maybe this is not hopeful for
me,because I would like the original AST being
transformed to CFG.How 
could I control your code to achieve this? Another
thing  is whether the simplification of the AST will
change the  
control flow of a function and will affect the
analysis on the CFG. If I generate the data dependence
graph of a  
function,can I utilize the reaching definition the
tree-ssa branch has completed .thanks a lot.

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