assembly - LOOP, LOOPE, LOOPNE? - Stack Overflow
网页2009年11月18日 · LOOPE loops "while zero flag," meaning it will loop as long as zero flag ZF is one and the increment is not reached, and LOOPNE loops "while not zero flag," meaning it continues the loop as long as ZF is zero and the increment is not reached. Keep in mind that neither of these instructions inherently affect the status of ZF. I believe that it ...
How to make a loop in x86 assembly language? - Stack Overflow
网页2015年11月9日 · Yet another method is using the LOOP instruction: mov cx, 3. myloop: ; Your loop content. loop myloop. The loop instruction automatically decrements cx, and only jumps if cx != 0. There are also LOOPE, and LOOPNE variants, if you want to do some additional check for your loop to break out early.
While, Do While, For loops in Assembly Language (emu8086)
网页2015年2月23日 · 1. And in asm, use the do{}while() loop structure whenever possible, for the same reason compilers do: code runs faster with fewer instructions inside the loop. (Usually peeling the run-zero-times check is better than jumping to the bottom of the loop like you're doing here in your while loop.) – Peter Cordes.
How exactly does the x86 LOOP instruction work?
网页2017年10月23日 · loop is exactly like dec ecx / jnz, except it doesn't set flags. It's like the bottom of a do {} while(--ecx != 0); in C. If execution enters the loop with ecx = 0, wrap-around means the loop will run 2^32 times. (Or 2^64 times in 64-bit mode, because it uses RCX.) Unlike rep movsb/stosb/etc., it doesn't check for ECX=0 before decrementing ...
for loop in Python - Stack Overflow
网页@aaronasterling: Perhaps you misunderstood, 50-100 microseconds per loop, not per iteration.If you care about that kind of speed, you shouldn't be using Python in the first place.
c++ - Why use infinite loops? - Stack Overflow
网页2010年5月27日 · 4. That's an incomplete example because it can be refactored to be an end-test loop with no loss of clarity, function or performance. scoped_variable = getSomeValue(); Infinite loops are most often used when the loop instance doesn't have the termination test at the top or the bottom, in the simplest case.
unix - Shell script "for" loop syntax - Stack Overflow
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Elements order in a "for (… in …)" loop - Stack Overflow
网页As stated by other answers, no, the order is not guaranteed. If you want to iterate in order, you can do something like: const sortedKeys = Object.keys(myObject).sort(); for (let key of sortedKeys) {. let value = myObject[key]; // Do what you want with key and value. } Note that performance-wise, this is not optimal, but that's the price when ...
java - For loops vs. While loops - Stack Overflow
网页2014年2月21日 · 0. A for loop is a while loop. The only difference is that the for loop includes an initialize and state-change options, whereas a while loop requires you to do those separately. The distinction is really more for ease of use and readability than it is purely functional. Say you want to iterate through a list:
How to create nested loops in x86 assembly language
网页2013年4月14日 · The actual code depends on your system, compiler and applied optimizations, but basically it should be something like this (example for 2 nested loops, not 3): mov ecx, 0. cmp ecx, 10. je done. mov ebx, 0. mov eax, ecx ; do your thing here. add eax, ebx. cmp ebx, 10. je innerLoopDone.