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A-4 Arrays and Pointers
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        In this program we observe how GCC treats arrays and pointers.

        Compile  the following  program (file  A-4.c) and  observe the  compiler
        output to answer the questions.

        Source file : A-4.c
        Compilation : gcc-4.7.2 -c -fdump-tree-cfg A-4.c
        View result : vi -O A-4.c A-4.c.*.cfg
        Clear dumps : rm -f A-4.c.* A-4.o

Program
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        int main()
        {
            int a[3];
            int b[] = {1, 2, 3};
            int i, *p;
            for (i=0; i<3; i++) {
                a[i] = b[i];
            }
            p = a;
            *(p + 2) = 5;
        }


Questions
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        1   How is array declaration and initialization handled?

        2   Why does the statement a[i] = b[i] get broken down to two steps with
            an intermediate temporary?

        3   Why are there CLOBBER statements at the end?