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Chapter 6. Pointers to Memory > Registers Revisited
6.3. Registers Revisited
EAX, EBX, ECX, EDX registers can be used as pointers to memory. EAX and EDX registers contain the multiplication result after executing IMUL instruction. ECX register is often used as a loop counter, E(Counter)X, in assembly language corresponding to simple loops in C and C++ code:
for (int i = 0; i < N ; ++i)