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

Describe in brief the history of e-commerce, Describe in brief the history ...

Describe in brief the history of E-Commerce.  History of E-commerce. E-commerce started before personal computers were prevalent and has grown into a multi-billion d

Elucidate basic time division time switching method, With the help of block...

With the help of block diagram Elucidate basic time division time switching method. Basic Time Division Switching: Functional blocks of a memory based time division switching

Determine about the three-state gate, Determine about the three-state gate ...

Determine about the three-state gate A three-state gate is a digital circuit which shows three states. Two of them are equivalent to logic 1 and 0.  The third one is a high im

The extra key inserted at the end of the array, The extra key inserted at t...

The extra key inserted at the end of the array is called a Sentinel is the extra key inserted at the end of the array

Explain step by step switching system with neat diagram, With the help of a...

With the help of a neat diagram explain a step by step switching system. Configuration of a step by step switching system: A step by step switching system may be constr

What are the user interfaces of interactive lists, What are the user interf...

What are the user interfaces of interactive lists? If you require the user to communicate with the system during list display, the list must be interactive.  You can describe

Ict, how to become an ict enginer

how to become an ict enginer

Determine the nand gate, Find out the two inputs when the NAND gate output ...

Find out the two inputs when the NAND gate output will be low. Ans. The output of NAND gate will be low if the two inputs are 11. The Truth Table of NAND gate is shown

What is random access memory, What is Random access memory (RAM) This i...

What is Random access memory (RAM) This is a volatile memory (i.e. contents are lost when computer is switched off). A user can write or delete data and read the contents. Befo

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