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 is function overloading, a. Describe function declaration, function de...

a. Describe function declaration, function definition and function cell using a suitable example. Explain the function prototype? b. What is function overloading? When do we use

What is test requirements, Test requirements are definite in the Requiremen...

Test requirements are definite in the Requirement Hierarchy in TestManager. The requirements hierarchy is a graphical outline of requirements and nested child requirements. Req

Feasebility study, what are the feasibility study of online result manageme...

what are the feasibility study of online result management system?

What are the different pieces of the virtual address, What are the differen...

What are the different pieces of the virtual address in a segmented paging? The various pieces of virtual address in a segmented paging are as demonstrated below:

Concept of pipelining, Describe the concept of pipelining. Ans: Pipeli...

Describe the concept of pipelining. Ans: Pipelining is the means of executing machine instructions concurrently. This is the effective way of organizing concurrent activity in

Equivalence between vhdl and c, Equivalence between VHDL and C? There i...

Equivalence between VHDL and C? There is concept of understanding in C there is structure.Based upon requirement structure provide facility to store collection of various data

How dreamweaver work in layout view, Q. How Dreamweaver Work in Layout View...

Q. How Dreamweaver Work in Layout View? Dreamweaver has two visual design views-Standard view and Layout view. You will start by working in Layout view, which allows you to dra

Describe session handling in a web farm, Describe session handling in a web...

Describe session handling in a web farm, how does it work and what are the limits ?   In ASP.NET there are three ways to handle session objects. Single support the in-proc mec

What are the mapping techniques, What are the mapping techniques? a)Dir...

What are the mapping techniques? a)Direct mapping b) Associative mapping c)  Set associative mapping

Starting parallel virtual machine, Q. Starting parallel virtual machine? ...

Q. Starting parallel virtual machine? To initialize PVM on any host on that PVM has been installed we can type  % pvm The PVM console known as pvm is a standalone PVM t

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