Creating temporary variables

[VIbhav Garg]

Hi,

I am working on some optimizations on the CFG. Can someone please give
me some info on the following -

1. For an gimple expression node, how do we determine the return type?
2. How do we create a temporary variable, and add it to the list of
variables defined in the current function declaration?
3. Any particular code I can look at to see how it works.
4. Any issues I should be aware of?

Thanks
Vibhav