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

Link your documents to site, Images in the top area of Compass home page gu...

Images in the top area of Compass home page guide visitors to specific pages on the site. Now you will add links for navigation buttons. You will see that there are some ways to

Speed up factor, Remember, the value of α is between 0 and 1. Now, let us p...

Remember, the value of α is between 0 and 1. Now, let us put some values of α and compute the speed up factor for increasing values of number of processors.  We get that the S(N) k

Conjunctive normal form -artificial intelligence , Conjunctive Normal Form ...

Conjunctive Normal Form -artificial intelligence : For the resolution law to determine two sentences, they should both be in a normalized format known as conjunctive normal fo

Explain client server model, Explain Client Server Model. In the client...

Explain Client Server Model. In the client- server model, communication usually takes the form of a request message from the client to the server asking for several works to be

Explain function of network layer in tcp/ip protocol stack, Explain about t...

Explain about the function of network layer briefly in TCP/IP protocol stack. Internetwork Layer: The best-called TCP/IP protocol at internetwork layer is Internet Protoc

Explain organisations use in electronic data interchange, Explain about the...

Explain about the organisations use in EDI. Organisations, which are use Electronic Data Interchange. Extensive users of Electronic Data Interchange (EDI) include: BHS:

Multi-layer network architectures, Multi-Layer Network Architectures: ...

Multi-Layer Network Architectures: As we considered we saw in the previous lecture that perceptrons have limited scope in the type of concepts that they can learn - but they c

4 variable k-maps, 4-variable K-maps have 16 squares which arearranged in 4...

4-variable K-maps have 16 squares which arearranged in 4 columns and 4 rows.  Columns and rows are labeled with 2 variables. The rows are arranged so that C or D ch

Numbers of students must be integer, A school district has I neighbourhoods...

A school district has I neighbourhoods, J schools and G grades at every school. Every school j has a capacity of C jg for grade g. In every neighbourhood i, the student population

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