Convert the below C code snippet to ARMv8 assembly code. Assume variables a, b, c, and i are stored in registers X20, X21, X22, and X9 respectively and the array x is stored as a static array in the data section. Assume all the values are 64-bits and are unsigned integers. Do not use divide and multiply instructions in your code.

for (i=a;i>b;i--)

{

x[i-1] = x[i] + x[c/4];

}