Explain loop-invariant code motion, Computer Engineering

Assignment Help:

Explain briefly Loop-invariant code motion of the commonly used code optimization techniques.

Loop-invariant code motion

If a quantity is calculated inside a loop during iteration and its value is similar for iteration, this can vastly improve efficiency to hoist this outside the loop and calculate its value just once before the loop begins. It is particularly significant with the address-calculation expressions generated through loops over arrays. For accurate implementation, such technique must be utilized with loop inversion, since not all code is safe to be hoisted outside the loop.

For illustration:

 for (i=1; i≤10, i++){

x=y*2-(1)

.

.

.

}

statement 1 can be hoisted outside the loop assuming value of x and y does not modify in the loop.


Related Discussions:- Explain loop-invariant code motion

What are the simplest way to restrict the users, What are the simplest way ...

What are the simplest way to restrict the users The simplest way to restrict the users to peek inside the internals of the Web site is to use firewalls, where the information c

What is an html tag, An HTML tag is a syntactical construct in the HTML lan...

An HTML tag is a syntactical construct in the HTML language that abbreviates particular instructions to be implemented when the HTML script is loaded into a Web browser. It is like

Explain the term - strong typing and weak typing, Explain the term - Strong...

Explain the term - Strong Typing and  Weak Typing Strong Typing : When any operation upon an object can be checked during compile time, when type is confirmed forcefully.

Paging, specification of paging ram size is 12 frames

specification of paging ram size is 12 frames

Pros and cons of assembly language, Pros and Cons of Assembly Language ...

Pros and Cons of Assembly Language The following are a number of advantages / disadvantages of employing assembly language: Assembly Language offers more control over ha

Datatype functions for message passing, Q. Datatype Functions for Message P...

Q. Datatype Functions for Message Passing? Datatype: It denotes type of data in message. This field is essential in the sense that MPI supports heterogeneous computing and diff

Define pvm library routines, Q. Define PVM library routines? In this se...

Q. Define PVM library routines? In this segment we will give a short description of the routines in PVM 3 user library. Each PVM program must comprise the PVM header file 'pvm3

Explain about the voice recognition device, Explain about the Voice recogni...

Explain about the Voice recognition device Blind and partially-sighted people can communicate with a computer using microphone and software (keyboard and touch screens can't be

Communication process, 1)    Describe challenges involved for both the send...

1)    Describe challenges involved for both the sender and the receiver in the communication process. 2)    Describe the purpose of a subject line in an email message and give gui

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd