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 commitment unit, What is commitment unit? When out-of-order exe...

What is commitment unit? When out-of-order execution is permitted, a special control unit is required to guarantee in-order commitment. This is known as the commitment unit. It

Explain an interrupt, Used to interrupt CPU normal implementation routine a...

Used to interrupt CPU normal implementation routine and to get its attention .Mostly generated by an external devices, timers, counters...etc

Show the characteristic of cache memory, Q. Show the characteristic of cach...

Q. Show the characteristic of cache memory? The essential characteristic of cache memory is its fast access time. So very little or no time should be wasted when searching for

Permanently resident pages - main memory, Permanently resident pages: ...

Permanently resident pages: Every virtual memory systems have memory areas that are "pinned down", for example cannot be swapped out to secondary storage, for instance:

Explain telephone hand set and working, Explain Telephone hand set and it's...

Explain Telephone hand set and it's working. A standard telephone set is consisted of a transmitter, electrical network and a receiver for equalization, connected circuitry to

What is public key cryptography, What is Public Key Cryptography Publi...

What is Public Key Cryptography Public-key cryptography is a form of modern cryptography which permits users to communicate safely without lastly agreeing on a shared secret

Explain about strategic planning and sensitivity training, Q. Explain about...

Q. Explain about strategic planning and sensitivity training? Formulation of business strategy with the due consideration of environmental analysis and organizational appraisal

Explain inheritance, Can you explain what inheritance is and an example of ...

Can you explain what inheritance is and an example of when you might use it? The process of deriving a new class from an existing class is known as Inheritance. The old class i

Vliw architecture, Vliw Architecture Superscalar architecture was desig...

Vliw Architecture Superscalar architecture was designed to develop the speed of the scalar processor. But it has been realized that it is not easy to execute as we discussed pr

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