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B-2 Loop Unrolling
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        In this  program we observe how  loops can be unrolled  by repeating the
        loop body  if the compile time  estimate of the loop  count is available
        and unrolling does not become too large.

        Source file : B-2.c
        Compilation : gcc-4.7.2 -c -O2 -fdump-tree-all B-2.c
        View result : vi -O B-2.c.*.ssa B-2.c.*.cunroll
        Clear dumps : rm -f B-2.c.* B-2.o

Program
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        int N;

        int main()
        {
            int i, a = 10;
            for(i= 0; i < 4; i++)
            {
        	a = a + N;
            };
            return a;
        }

Questions
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        1   What will happen if "a = a + N" is replaced by "a = a + 1"?