How to use Assembly instruction appropriately within C++ Program,When?

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Hi,

Simply,I want to know when and how to integrate appropriate assembly instructions within C++(I am using Visual C++) program boundary/enviornment to gain more efficient and effectiveness via optimization(Compile-time & Run-time).
I've already referred "Text Book - "Visual C++ Optimization With Assembly Code",but some of its topics were designed for Experienced People.Please provide simple guidelines (Why do we want to use them properly,when to use them and how?) with relevant examples to explain how to use assembly/intrinsic instructions within C++ for specific platform or platform independently.
Thank in advance.

Posted 15-Jan-15 17:52pm

Buddhi Chaturanga

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KarstenK 16-Jan-15 2:56am

Todays compiler and linker are fine, so assembler code isnt often needed. My opinion is, that today the software design, usability and stability (DAU and fool proof) is the focus of software development.

Buddhi Chaturanga 17-Jan-15 14:03pm

There are some particular cases in optimization;that compiler cannot make a decision or produce.

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_Asif_ · Accepted Answer · 2015-01-15T20:47:00

Solution 1

This can't be answer in a couple of lines. Better find and read more books, One book is usually not enough.

For basic please see below article

Using Inline Assembly in C/C++[^]

Posted 15-Jan-15 20:47pm

_Asif_

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Buddhi Chaturanga 17-Jan-15 14:04pm

Thank you for the reply,really appreciated.The link was really helpful.

Jochen Arndt · Accepted Answer · 2015-01-15T21:03:00

This cant' be answered in short. When providing all requested information (why, when, how, examples, platform / compiler support) the answer can be posted as article here.

Using inline assembly and intrinsics is an advanced topic. When not having experiences so far you must put some time and effort into reading. This includes knowledge of the used processor and its assembly language.

Why
To reduce execution time of time critical code or when the problem can't be solved otherwise (e.g. using specific intrinsics).

When
Only if really necessary.

How
This depends on the used compiler and platform (e.g. inline assembly is not supported by the MS compiler when building 64-bit applications). See the compiler documentation.

CPallini · Accepted Answer · 2015-01-15T21:03:00

Solution 2

If you are a unexperienced then it doesn't make much sense such kind of advanced optimization: you better fine tune your algorithms (as well compiler optimization settings). If you really need such kind of optimization then you probably have to gain some experience (unfortunately "there is not a Royal Road to geometry").

Posted 15-Jan-15 21:03pm

CPallini

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Buddhi Chaturanga 17-Jan-15 14:04pm

Hahaha agree,, Thank you for the reply :D

CPallini 17-Jan-15 16:04pm

You are welcome.

How to use Assembly instruction appropriately within C++ Program,When?

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