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

Web technology, Write short notes on Event Model.

Write short notes on Event Model.

Explain various fields in ipv6 base header, Explain various fields in IPV6 ...

Explain various fields in IPV6 base header? Although IPv6 base header is double as large as an IPv4 header, this contains less information. Given diagram demonstrates the forma

Electronic brokerage facilitate search and retrieval, How does electronic b...

How does electronic brokerage facilitate search and retrieval of information? E Brokerage facilitates search and retrieval of Information: The success aspect of a brokera

Real life business subsystems, Real Life Business Subsystems A Subsyst...

Real Life Business Subsystems A Subsystem is a component of a System even though it can also be described as a system in its own right. Consider a manufacturing firm. It compr

Reduced instruction set computer - risc, Reduced Instruction Set Computer (...

Reduced Instruction Set Computer (RISC): As we discussed before most of the modern CPUs are of the GPR (General Purpose Register) type. A few instances of such type of CPUs ar

What is a file, What is a file? A file is a named collection of relate...

What is a file? A file is a named collection of related information that is recorded on secondary storage. A file having either programs or data. A file has sure "structure" b

How to clear a datagrid on a button click, How to clear a datagrid on a but...

How to clear a datagrid on a button click? You require to Clear the DataSource of the dataGrid. So try this: dataSet1.Clear(); dataGrid1.DataSource = dataSet1.TableNam

Define word length, Define word length?  Every group of n bits is refer...

Define word length?  Every group of n bits is referred to as a word of information and n is known as the word length.

Develop a plan to apply theory of constraints, 1. The Goal: Do you think th...

1. The Goal: Do you think that this is an operational methodology or a philosophy? Please explain. 2. How to apply Constraint Management to a Production Facility? How about to a

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