Table of Contents
- 1 What is REPE in assembly language?
- 2 What does Rep do in assembly?
- 3 Is Rep a prefix?
- 4 What is Rep x86 assembly?
- 5 Why is repetition and rephrasing important?
- 6 How is string represented in assembly?
- 7 What is the full form of rep?
- 8 What does the prefix Rep mean?
- 9 What is the meaning of Rep in Intel’s instruction sequence?
- 10 How much memory does reprep Ret use?
What is REPE in assembly language?
REPE and REPZ are mnemonics for the same prefix; they stand for Repeat if Equal and Repeat if Zero respectively. REPE/REPZ causes the succeeding string instruction to be repeated as long as the comapred bytes or words are equal (ZF = 1) and CX is not yet counted down to zero.
What does Rep do in assembly?
Example. Repeat while equal: Copy the 8-bit byte from the DS:[(E)SI] to the ES:[(E)DI] register.
What is the use of REPE?
The important thing is that you use repetition in a smart way that adds emphasis to particular ideas. That emphasis can make the tone more convincing, more emotional, more dramatic, etc. Furthermore, repetition can create rhythm that makes a work’s style appealing, which is then more attractive to the audience.
Is Rep a prefix?
REP is a prefix written before one of the string instructions. It is used for repeating an instruction count number of times, where count is stored in the CX register.
What is Rep x86 assembly?
rep: repeat while equal.
What is the difference between div and IDIV?
The DIV instruction divides unsigned numbers, and IDIV divides signed numbers. Both return a quotient and a remainder. The dividend is the number to be divided, and the divisor is the number to divide by. The quotient is the result.
Why is repetition and rephrasing important?
First, if you have already understood the main point, then you do not need to listen as intensively when it is rephrased, repeated or summarised. Secondly, it gives you an opportunity to check what you thought was the main point, especially when it is being summarised.
How is string represented in assembly?
A string is represented as an array of char.
Whats the meaning of reps?
Reps is short for repetitions, or the number of times that you perform any given exercise in your workout. If a fitness instructor or an online training plan tells you to do 10 reps of a body-weight squat, that means you’ll repeat the exercise 10 times.
What is the full form of rep?
Rep is short for representative.
What does the prefix Rep mean?
I know that rep is a prefix that means “repeat the next instruction cx times” (or at least it was, in old 16-bit x86 assembly). According to this summary table at Wikipedia, it seems rep can only be used with movs, stos, cmps, lods, scas (but maybe this limitation was removed on newer processors).
What is the meaning of repZ in C?
rep; repnz; repz; Operation. Description. Use the rep (repeat while equal), repnz (repeat while nonzero) or repz (repeat while zero) prefixes in conjunction with string operations. Each prefix causes the associated string instruction to repeat until the count register (CX) or the zero flag (ZF) matches a tested condition.
What is the meaning of Rep in Intel’s instruction sequence?
As to the meaning of rep ret, there is no mention of this instruction sequence in the Intel Instruction Set Reference, and the documentation of rep is not being very helpful: The behavior of the REP prefix is undefined when used with non-string instructions. This means at least that the rep doesn’t have to behave in a repeating manner.
How much memory does reprep Ret use?
rep ret isn’t used often enough to add up to much of anything. For example, firefox with all the libraries it has mapped is only has ~9k instances of rep ret. So that’s about 4k bytes, across many files. (And less RAM than that, since many of those functions in dynamic libraries are never called.)