The Gateway to Computer Science Excellence
First time here? Checkout the FAQ!
0 votes
In x86, which of the following is not executed by itself ?
(A) cld
(B) rep
(C) std
(D) nop
asked in CBSE/UGC NET by Junior (617 points)
retagged by | 341 views

1 Answer

+3 votes
Best answer

ans is D nop

A NOP is a computer instruction that does nothing apart from advance the program counter. It’s a waste of time and of the space it occupies in memory

Repeat instructions

REP: Repeat

Processor Control Instructions

STD, CLD: Set, clear   direction flag. 

answered by Boss (48.6k points)
selected by

Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true

37,117 questions
44,700 answers
43,763 users