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

Explain adaptive routing, Explain adaptive routing. Adaptive routing de...

Explain adaptive routing. Adaptive routing defines the ability of a system, by which routes are characterised through their destination, to change the path that the route takes

What is segment - assembler directives, What is SEGMENT - Assembler directi...

What is SEGMENT - Assembler directives SEGMENT:  This directive defines to assembler the start of a segment with name segment-name.  Segment name must be unique and follows the

What is indexing, What is indexing? Specific fields shown on each scann...

What is indexing? Specific fields shown on each scanned document are provided to our organization to make the systematic arrangement of your records. This process is designed t

Various phases of consumer merchantile model, What are the various phases o...

What are the various phases of consumer merchantile model and also differentiate between prepurchase interaction & post purchase interaction.    There are three phase of consumer

Back propagation learning routine, Back propagation Learning Routine - Aart...

Back propagation Learning Routine - Aartificial intelligence As with perceptrons, the information in the network is stored in the weights, so the learning problem comes down to

Explain bitwise-inclusive-or operato, Bitwise-Inclusive-OR Operator: i...

Bitwise-Inclusive-OR Operator: inclusive-OR-expression : exclusive-OR-expression inclusive-OR-expression | exclusive-OR-expression The  bitwise-inclusive-OR  operator

Design a memory buffer of limited size, Extend task 1 so that it now suppor...

Extend task 1 so that it now supports a memory buffer of limited size. Provide the same functionality as task 1 except now make the server work with a limited buffer size. Like

Why java is called machine independent, Why Java is called Machine Independ...

Why Java is called Machine Independent? While a java program is compiled this is not converted in an executable code. Rather, this is converted in a byte code. Byte code is hig

What is the difference between awt and swt, SWT (Standard Widget Toolkit) i...

SWT (Standard Widget Toolkit) is a totally independent Graphical User Interface (GUI) toolkit from IBM. They formed it for the creation of Eclipse Integrated Development Environmen

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