Explain the data dependency, Computer Engineering

Assignment Help:

Data Dependency

It indicates to the situation in which two or more instructions share same data. The instructions in a program are able to be arranged based on relationship of data dependency. It means how two segments or instructions are data dependent on each other. The subsequent types of data dependencies are identified:

i)  Output dependence: When output of the two instructions I1 and I2 overlap on same data, the instructions are said output dependent.  

ii) I/O dependence: When read and write operations by two instructions are invoked on the same file, it's the condition of I/O dependence.

iii) Flow dependence: If instruction I2 follows I1 and output of I1 becomes input of I2, then I2 is said to be flow dependent on I1

iv) Anti dependence: When instruction I2 follows instruction I1 such that output of instruction I2 overlaps with the input of instruction I1 on the same data.

Think about the subsequent program instructions:

I1: a = b

I2: c = a + d

I3: a = c

In this program segment instructions I1 and I2 are Flow dependent since variable a is produced by instruction I1 as output and used by instruction I2 as input. Instructions I2 and I3 are Anti dependent since variable a is produced by I3 but used by I2 and in sequence I2 comes first. I3 is flow dependent on I2 due to variable c. Instructions I3 and Instruction I1 are Output dependent since variable a is produced by both instructions.


Related Discussions:- Explain the data dependency

What is a structure, What is a structure? A structure is a collection o...

What is a structure? A structure is a collection of variables under a single name. These variables can be of different types, and each has a name which is used to select it fro

Labels in the sub trees, A sorting method which uses the binary tree concep...

A sorting method which uses the binary tree concept such that label of any node is larger than all  the labels in the sub trees, is called A Sorting method which uses the binar

Explain the use of wire-center have any influence, Does the use of wire-cen...

Does the use of wire-center have any influence on the performance of a token ring? Explain. One problem along with a ring network is as if the cable breaks somewhere, the ring

What is multiplicity, What is multiplicity? Multiplicity is applied to ...

What is multiplicity? Multiplicity is applied to attributes for data base application. Multiplicity for an attribute specifies the number of possible value for every instantiat

Which function type is used for using "at exit-command", Which Function typ...

Which Function type has to be used for using "at exit-command" ? To Use AT EXIT - COMMAND, We must assign a function Type "E" to the relevant function in the MENU Painter OR S

Online Library management system, Please help me to do mini Project about t...

Please help me to do mini Project about this by creating simple front and back end by using html and css and any programming language like python,php to connect those front end and

State the term in detail $strobe, State the term in detail $strobe $str...

State the term in detail $strobe $strobe. This task is very similar to $display task except for a slight difference.  If many other statements are executed in same time unit as

What start bit and stop bit, What start bit and stop bit The first bit ...

What start bit and stop bit The first bit known as the Start bit is always a zero and it is used to show the beginning of the character The last bit is known as the stop bit

Explain about the view selection problem, Often calculating all the data is...

Often calculating all the data is not possible by aggregations for this reason some of the difficult data problems are solved. In order to verify which data should be solved and me

Explain about magnetic disk, Q. Explain about Magnetic Disk? A disk is ...

Q. Explain about Magnetic Disk? A disk is circular platter constructed of nonmagnetic material known as substrate, coated with a magnetisable material. This is used for storing

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