Please help with assebmly implementation

The assembly code on the right partially implements the C function shown on the left. Fill in the missing instruction to correctly implement the C function on the left. rfoo: %rbx movq cmpq $0,%rbx jne L3 movq %rbx , %rax shrq pushq %rax call rfoo a, int a int rfoo(x) int rval; if (a= 0) return 1; return rva L2 jmp movq ret $1, %rax L2