please all parts A , B , and C

Convert each of the below C code snippet to LEGv8 assembly code. Assume variables a, b, and c are stored in registers X19, X20, and X21 respectively and are 64-bits non-zero positive integer. Base address of d is stored in register X22. Do not use multiply and divide instruction. Comment your assembly code. (30 Points) a. if (b 1;i--) while ((d[i] > 0) && (d[i+1] > a))