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a1ve Expression and Assignments
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        Compile  the following  program  (file a1ve.c)  and observe  the
        GIMPLE dumps  and answer the  questions below. If you  manage to
        finish  all  questions  quickly  try  to  attempt  the  optional
        problem.

        Source file : a1ve.c
        Compilation : gcc -c -fdump-tree-gimple a1ve.c
        View result : vi -O a1ve.c a1ve.c.*.gimple
        Clear dumps : rm -f a1ve.c.* a1ve.o

Program
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        int N;
        void main()
        {
            int a, b;
            int c = 2;
            int x;
            a = b;
            x = 5;
            c = a + b;
            x = N * 2;
            c = a * 2 + b * 3;
            N = c + x;
        }

Questions
---------

        1   How do the declarations look in the GIMPLE? Specifically, what 
            happens to: 
            (a) the multi-variable declaration [int a, b], 
            (b) the initialization declaration [int c = 2], and 
            (c) the global declaration [int N]? 
            
        2   How do assignment statements get translated into GIMPLE? Is there
            any difference between constant assignments, variable assignments,
            simple expressions, and assignments to globals?
            
        3   How are complex expressions such as [c = a * 2 + b * 3] broken down?

        4   Why do you think simple expressions [c = a + b] can appear in GIMPLE
            but not a complex expression [c = a * 2 + b * 3]?
            
Optional Problem
----------------

        Try to understand the underlying GIMPLE representation by 
        looking at the RAW dumps:

        Compilation : gcc -c -fdump-tree-gimple-raw a1ve.c
        View result : vi -O a1ve.c a1ve.c.*.gimple