int sum(int n){

int i=0; int s=0; for(int i=0; i<= n; i++){ s=s+i; }

printf("The sum of first %d numbers is %d. ", n,s); }

Disassembly of section .text:

0000000000000000 : 0: 48 83 ec 08 sub $0x8,%rsp 4: 89 fe mov %edi,%esi 6: b8 00 00 00 00 mov $0x0,%eax b: ba 00 00 00 00 mov $0x0,%edx 10: 39 f0 cmp %esi,%eax 12: 7f 07 jg 1b 14: 01 c2 add %eax,%edx 16: 83 c0 01 add $0x1,%eax 19: eb f5 jmp 10 1b: bf 00 00 00 00 mov $0x0,%edi 20: b8 00 00 00 00 mov $0x0,%eax 25: e8 00 00 00 00 callq 2a 2a: 48 83 c4 08 add $0x8,%rsp 2e: c3 retq

Study the generated assembly and find out what registers are used to store variables i and s of the code in sum.c. Explain your reasoning.