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

Decision tree learning, Decision Tree Learning: Furthermore there is s...

Decision Tree Learning: Furthermore there is specified in the last lecture such as the representation scheme we choose to represent our learned solutions and the way that we l

What is the significance of the memory table ''screen'', What is the signif...

What is the significance of the memory table 'SCREEN'? At runtime, attributes for every screen field are stored in the memory table called 'SCREEN'.  We need not declare this

What is low-level formatting, What is low-level formatting?  Before a d...

What is low-level formatting?  Before a disk can store data, it must be divided into sectors that the disk controller can read and write. This process is known as low-level for

What is multiprogramming, Multiprogramming is a rapid switching of the CPU ...

Multiprogramming is a rapid switching of the CPU back and forth among processes.

Expalin the history of parallel computers, Expalin the History Of Parallel ...

Expalin the History Of Parallel Computers The researches with and implementations of use of the parallelism started long back in the 1950's by IBM Corporation. The IBM STRETCH

C++, explain parallel database system

explain parallel database system

What is npblox framework, Designed, developed, tested and documented the de...

Designed, developed, tested and documented the demo created for NPBlox framework. NPBlox framework is a framework which enabled developers to create CLI/WEB/SNMP interfaces for

What are the issues of software development, What are the issues of softwar...

What are the issues of software development One of main issues in software development today is quality. Software must be properly documented and implemented. The notion of sof

Dialog-task updates, Dialog-task updates are Synchronous updates.

Dialog-task updates are Synchronous updates.

What is analysis iteration, Analysis Iteration   To understand any prob...

Analysis Iteration   To understand any problem completely you have to repeat task which implies that analysis requires repetition. First, just get overview of problem, make a r

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