May 12, 2016 · If the ECX register is zero then the repe cmpsb is not executed at all. This means that the following setb and seta instructions would produce garbage! Thus the programmer …

Nov 11, 2022 · eax, ebx, ecx and so on are actually registers, which can be seen as "hardware" variables, somewhat similar to higher level-language's variables. Registers can be used in …

Sep 14, 2012 · ecx is a x86 CPU register, which can hold a value of a certain amount of bits (32 or 64 (called rcx then) on modern x86 CPU's). The call stack is divided into stack frames . …

Nov 18, 2018 · @Kaunda Well, when you put the length in ecx and the pointer to the message into edx, the kernel still thinks that ecx contains the pointer to the message and edx contains …

imul also has an immediate form: imul ecx, ebx, 1234 does ecx = ebx * 1234. Many assemblers will accept imul ecx, 1234 as short-hand for imul ecx, ecx, 1234 . These 32x32 => 32-bit forms …

Jun 8, 2019 · At the point where you use your getstring macro to call it, ECX holds main's loop counter, so your max-length character limit decreases with each outer-loop iteration. Pick a …

Jul 24, 2011 · mov ecx, N jmp bottom top: BODY dec ecx bottom: cmp ecx, 0 jne top Now we still do N conditional jumps but we only do ONE unconditional jump. A small savings but it just …

Jun 10, 2014 · ecx was the count register which held a loop counter; edx was the data register which you could use for I/O port access; edi was the destination index register which pointed …

Sep 19, 2012 · Notice how the first call to the static S::f method has the first argment (3) passed in ecx and the second argment (4) in edx. So the answer to your question is: Yes. For this …

Jan 16, 2016 · IDIV ecx in assembly, then i have read that the that the value in edx:eax is divided by the operand ecx. I also know that the quotient is stored in eax and the remainder in edx. so …