Assume EDX:EAX and EBX:ECX pairs hold two 64 bit values that are to be added together.

add     eax, ecx
adc     edx, ebx
mov     dword [ebp+Some64BitValue], eax
mov     dword [ebp+Some64BitValue+4], edx

add     eax, dword [esi]
adc     eax, dword [esi+0x4]
adc     eax, dword [esi+0x8]
adc     eax, dword [esi+0x10]
...
adc     eax, 0