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

Input-output-processor interconnection network (iopin), Input-Output-Proces...

Input-Output-Processor Interconnection Network (IOPIN) This interconnection network is used for communication between I/O channels and processors. All processors commune with a

Advantages & disadvantages of public-key cryptography, Advantages & Disadva...

Advantages & Disadvantages Enhanced security and convenience: private keys never require be transmitting or revealing to anyone.  They can givce a method for digital signatu

What are prefetch instructions, What are prefetch instructions? Prefetc...

What are prefetch instructions? Prefetch instructions are those instructions which can be inserted into a program either by the programmer or by the compiler.

Arterial puncture - specimen collection, Arterial puncture - Specimen colle...

Arterial puncture - Specimen collection: Arterial puncture:    this requires special skill and usually performed only by physician. The preferred site is radial arter

What is the use of ''using'' declaration in c++, A using declaration in C++...

A using declaration in C++ makes it likely to use a name from a namespace without the scope operator.

Define user mode and kernel mode, Define user mode and Kernel mode Kern...

Define user mode and Kernel mode Kernel is a private mode in that no limitation is imposed on the kernel of system. Kernel may be use all the information of the processor, oper

How can you insert text in dreamweaver, Q. How can you insert text in dream...

Q. How can you insert text in dreamweaver? In Dreamweaver, you can type content directly into a layout cell, or you can cut and paste content from another document into a layou

Web designing, how to start a web designing would you please guide me

how to start a web designing would you please guide me

Design a BCD to excess 3 code converter using NAND gates, Design a BCD to e...

Design a BCD to excess 3 code converter using minimum number of NAND gates. Hint: use k map techniques. Ans. Firstly we make the truth table: BCD no

Explain difference between macro call and macro expansion, Explain differen...

Explain difference between macro call and macro expansion. Macro expansion: While a macro name is used along with a set of actual parameters this is replaced through a code g

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