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 are different types of verilog simulators, What are Different types of...

What are Different types of Verilog Simulators? There are essentially two types of simulators available. -  Event Driven -  Cycle Based

In 8085 which is called as high order / low order register, Flag is known a...

Flag is known as Low order register & Accumulator is known as High order Register.

Vertical alignment of fields one below the other, Which Command permits for...

Which Command permits for vertical alignment of fields one below the other. UNDER Command is used ofr vertical alignment.

Economic argument for good design, One way of demonstrating the importance ...

One way of demonstrating the importance of good ID is by showing tangible benefits that can be talked about in cash terms. Within a business, good ID can lead to benefits such as h

What is gimp?, The GNU Image Manipulation Program, or GIMP, is a raster gra...

The GNU Image Manipulation Program, or GIMP, is a raster graphics editor application with some support for vector graphics. GIMP is used to process digital graphics & photographs.

Conclusion - artificial intelligence , Conclusion - artificial intelligence...

Conclusion - artificial intelligence : If we can determine what the exactly state of the world will be after an agent's action, so we can say the environment is deterministic.

What is the meaning of proper programming, What is the meaning of Proper pr...

What is the meaning of Proper programming Proper programming of the ports of the company's Web server through detection of IP addresses could be an excellent strategy or solut

Secondary memory and characteristics, It is desirable that operating speed ...

It is desirable that operating speed of primary storage of a computer system be as fast as possible since most of the data transfer to and from processing unit is via main memory.

Explain virtual memory, In a memory hierarchy system, data and programs are...

In a memory hierarchy system, data and programs are first stored in secondary or auxiliary memory. Program and its related data are brought in main memory for execution. What if th

Explain cell spacing and cell padding, Q. Explain Cell Spacing and Cell Pad...

Q. Explain Cell Spacing and Cell Padding? Couple of attributes known as CELLSPACING and CELLPADDING. Both are part of tag. CELLPADDING is the amount of space between

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