IPA / Cgraph how to get a real COPY of a function body

[Martin Schindewolf]

Dear all,

my current efforts to get some basic support for transactional memory in 
GCC advance slowly but there is one thing I would like to ask because it 
stopped me for days now. What is the best way to do the function cloning 
in order to have the original function and a transactional clone at the 
same time? I tried all sorts of cloning and copying the whole tree using 
functions from Cgraph and Ipa passes but somehow I always end up with a 
cloned declaration node and a function body that is not a copy of the 
original but a pointer to it. At least that is my experience until now. 
Following the general idea of having a copy of the original function 
early in the passes and inserting the necessary instrumentations later 
when the expansion of the GTM primitives is done, this behaviour leads 
to problems. What would be the best way to get a real copy of a function 
body?

Any help is greatly appreciated.

Regards,
Martin