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

client will now send ten integers , Change this program so that every clie...

Change this program so that every client will now send ten integers and receives their sum from the server. In Java, for loops can be easily executed as follows: for (int i = 0 ; i

Define about the objects, Define about the Objects The object notation...

Define about the Objects The object notation is the same in basic form as that for a class. There are three differences among the notations, these are given below: With

What is the difference among conventional and HD T.V, a. Write down the sal...

a. Write down the salient difference among conventional T.V. and High Definition TV (HDTV) and also highlight the various benefits of digital representation for video. b. Video

Explain design of adder, Q. Explain Design of adder? Adders play one of...

Q. Explain Design of adder? Adders play one of the most significant roles in binary arithmetic. As a matter of fact fixed point addition is frequently used as a simple measure

Vliw instruction word, VLIW instruction word is compacted to have floating-...

VLIW instruction word is compacted to have floating-point addition, one branch, floating point multiply, and one integer arithmetic and load/store operation as displayed in Figure

Explain in detail about operating system, Explain in detail about Operating...

Explain in detail about Operating Systems (OS) Operating system (OS) is a program which after being initially loaded into computer by a boot program, manages all the other appl

How do you traverse a btree in backward in-order, Put the node in the right...

Put the node in the right subtree Then, Put the root  Put the node in the left subtree

Show mpi functions, Q. Show MPI functions? MPI comprises hundreds of fu...

Q. Show MPI functions? MPI comprises hundreds of functions which are a small subset of which is enough for most practical purposes. We will discuss some of them here. Int M

Challenges facing operations managers - information systems, Challenges Fac...

Challenges Facing Operations Managers - Information Systems While information systems should be seen as tools that enable better performance their implementation also brings a

Show block diagram of sequential circuits, Q. Show block Diagram of sequent...

Q. Show block Diagram of sequential circuits? A sequential circuit is an interconnection of storage elements and combinational circuits. The storage elements known as flip-flop

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