Dump of assembler code for function phase 4 0x0000000000400f75 sub $0x18, rsp 0x0000000000400f79 lea 0x8( rsp), rcx 0x0000000000400f7e lea 0xc( rsp), rdx 0x0000000000400f83 mov $0x40244f, esi 0x0000000000400f88 mov $0x0, eax 0x0000000000400f8d callq 0x400ba0 0x0000000000400f92 cmp $0x2, eax 0x0000000000400f95 jne 0x400f9e 0x0000000000400f97 cmpl $0xe,0xc( rsp) 0x0000000000400f9c jbe 0x400fa3 0x0000000000400f9e callq 0x40134f 0x0000000000400fa3 mov $0xe, edx 0x0000000000400fa8 mov $0x0, esi 0x0000000000400fad mov 0xc( rsp), edi 0x0000000000400fb1 callq 0x400f42 0x0000000000400fb6 cmp $0xa, eax 0x0000000000400fb9 jne 0x400fc2 0x0000000000400fbb cmpl $0xa,0x8( rsp) 0x0000000000400fc0 je 0x400fc7 0x0000000000400fc2 callq 0x40134f 0x0000000000400fc7 add $0x18, rsp 0x0000000000400fcb retq Dump of assembler code for function func4 0x0000000000400f42 push rbx 0x0000000000400f43 mov edx, eax 0x0000000000400f45 sub esi, eax 0x0000000000400f47 mov eax, ebx 0x0000000000400f49 shr $0x1f, ebx 0x0000000000400f4c add ebx, eax 0x0000000000400f4e sar eax 0x0000000000400f50 lea ( rax, rsi,1), ebx 0x0000000000400f53 cmp edi, ebx 0x0000000000400f55 jle 0x400f63 0x0000000000400f57 lea 0x1( rbx), edx 0x0000000000400f5a callq 0x400f42 0x0000000000400f5f add ebx, eax 0x0000000000400f61 jmp 0x400f73 0x0000000000400f63 mov ebx, eax 0x0000000000400f65 cmp edi, ebx 0x0000000000400f67 jge 0x400f73 0x0000000000400f69 lea 0x1( rbx), esi 0x0000000000400f6c callq 0x400f42 0x0000000000400f71 add ebx, eax 0x0000000000400f73 pop rbx 0x0000000000400f74 retq This is what I know The input is suppose to be d d The first value has to be less then 14, and that func4 is recursive I am having trouble understanding exactly what func4 is doing though

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Question: Dump of assembler code for function phase_4: => 0x0000000000400f75 : sub $0x18,%rsp 0x0000000000400f79 : lea 0x8(%rsp),%rcx 0x0000000000400f7e : lea 0xc(%rsp),%rdx 0x0000000000400f83 : mov $0x40244f,%esi 0x0000000000400f88

Dump of assembler code for function phase_4: => 0x0000000000400f75 <+0>: sub $0x18,%rsp 0x0000000000400f79 <+4>: lea 0x8(%rsp),%rcx 0x0000000000400f7e <+9>: lea 0xc(%rsp),%rdx 0x0000000000400f83 <+14>: mov $0x40244f,%esi 0x0000000000400f88 <+19>: mov $0x0,%eax 0x0000000000400f8d <+24>: callq 0x400ba0 <__isoc99_sscanf@plt> 0x0000000000400f92 <+29>: cmp $0x2,%eax 0x0000000000400f95 <+32>: jne 0x400f9e 0x0000000000400f97 <+34>: cmpl $0xe,0xc(%rsp) 0x0000000000400f9c <+39>: jbe 0x400fa3 0x0000000000400f9e <+41>: callq 0x40134f 0x0000000000400fa3 <+46>: mov $0xe,%edx 0x0000000000400fa8 <+51>: mov $0x0,%esi 0x0000000000400fad <+56>: mov 0xc(%rsp),%edi 0x0000000000400fb1 <+60>: callq 0x400f42 0x0000000000400fb6 <+65>: cmp $0xa,%eax 0x0000000000400fb9 <+68>: jne 0x400fc2 0x0000000000400fbb <+70>: cmpl $0xa,0x8(%rsp) 0x0000000000400fc0 <+75>: je 0x400fc7 0x0000000000400fc2 <+77>: callq 0x40134f 0x0000000000400fc7 <+82>: add $0x18,%rsp 0x0000000000400fcb <+86>: retq

Dump of assembler code for function func4: 0x0000000000400f42 <+0>: push %rbx 0x0000000000400f43 <+1>: mov %edx,%eax 0x0000000000400f45 <+3>: sub %esi,%eax 0x0000000000400f47 <+5>: mov %eax,%ebx 0x0000000000400f49 <+7>: shr $0x1f,%ebx 0x0000000000400f4c <+10>: add %ebx,%eax 0x0000000000400f4e <+12>: sar %eax 0x0000000000400f50 <+14>: lea (%rax,%rsi,1),%ebx 0x0000000000400f53 <+17>: cmp %edi,%ebx 0x0000000000400f55 <+19>: jle 0x400f63 0x0000000000400f57 <+21>: lea -0x1(%rbx),%edx 0x0000000000400f5a <+24>: callq 0x400f42 0x0000000000400f5f <+29>: add %ebx,%eax 0x0000000000400f61 <+31>: jmp 0x400f73 0x0000000000400f63 <+33>: mov %ebx,%eax 0x0000000000400f65 <+35>: cmp %edi,%ebx 0x0000000000400f67 <+37>: jge 0x400f73 0x0000000000400f69 <+39>: lea 0x1(%rbx),%esi 0x0000000000400f6c <+42>: callq 0x400f42 0x0000000000400f71 <+47>: add %ebx,%eax 0x0000000000400f73 <+49>: pop %rbx 0x0000000000400f74 <+50>: retq

This is what I know. The input is suppose to be "%d %d". The first value has to be less then 14, and that func4 is recursive. I am having trouble understanding exactly what func4 is doing though.

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