1. b is 8

    op1 does 
        *b <-- *a + *b

    which sets the contents of y to be the contents of a and the
    contents of b, 3 and 5 respectively.

    op2 operates only on local copies of the variables (call-by-val) so
    has no effect on a or b.

2. Only d

3. c

4. 
        Stack pointer (%rsp) becomes 0xffd010 (optional part of answer)
        Frame pointer (%rbp) becomes 0xffff00
        Stack pointer (%rsp) becomes 0xffd018