Given the following C code and assumptions, write the x86 assembly code for the calling function and the subroutine. Assume that variable a is allocated to register %rbx, variable b is allocated to register %rcx, variable min is allocated to register %rdx, variable z is allocated to register %rbx, and finally all input and output parameters are allocated according to the conventions used in x86 assembly. Preserve only those registers that must be preserved across the subroutine call. int subroutine (int x, int y) { int z; z=x+y; if (x < y) return (x); else return (z); } void main (void) { int a, b, min; min = subroutine (a, b) }