To get a trial key
fill out the form below
Team License (standard version)
Enterprise License (extended version)
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Request our prices
New License
License Renewal
--Select currency--
USD
EUR
GBP
RUB
* By clicking this button you agree to our Privacy Policy statement

** This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Message submitted.

Your message has been sent. We will email you at


If you haven't received our response, please do the following:
check your Spam/Junk folder and click the "Not Spam" button for our message.
This way, you won't miss messages from our team in the future.

WoW64

March 31, 2013

WoW64 (Windows-on-Windows 64-bit) is a subsystem of Windows allowing you to launch 32-bit applications on all the 64-bit Windows versions. Launching of obsolete 16-bit applications on 64-bit Windows systems is impossible.

Wow64 subsystem emulates 32-bit environment with the help of an additional layer between a 32-bit application and 64-bit Windows API. In some places this layer is rather thin and in others it is not. For an average program presence of this layer will cause performance loss of about 2%. For some programs it can be greater. 2% is not much but you should take into account that 32-bit applications operate much slower under a 64-bit version of Windows operation system than under a 32-bit one.

Compilation of 64-bit code does not only exclude the necessity of WoW64 but also provides an additional performance gain. It is explained by architectural alterations within the microprocessor such as increase of the number of common-purpose registers. For an average program you can expect a 5-15% performance gain after simple recompilation of the program.

An additional performance gain can be achieved when using 64-bit data types. Viva64 static code analyzer can help you here. Although its main purpose is searching errors in 64-bit code, still you can increase a program's operation rate following its recommendations.

References

Popular related articles
How PVS-Studio Proved to Be More Attentive Than Three and a Half Programmers

Date: 10.22.2018

Author: Andrey Karpov

Just like other static analyzers, PVS-Studio often produces false positives. What you are about to read is a short story where I'll tell you how PVS-Studio proved, just one more time, to be more atte…
Free PVS-Studio for those who develops open source projects

Date: 12.22.2018

Author: Andrey Karpov

On the New 2019 year's eve, a PVS-Studio team decided to make a nice gift for all contributors of open-source projects hosted on GitHub, GitLab or Bitbucket. They are given free usage of PVS-Studio s…
Appreciate Static Code Analysis!

Date: 10.16.2017

Author: Andrey Karpov

I am really astonished by the capabilities of static code analysis even though I am one of the developers of PVS-Studio analyzer myself. The tool surprised me the other day as it turned out to be sma…
The Evil within the Comparison Functions

Date: 05.19.2017

Author: Andrey Karpov

Perhaps, readers remember my article titled "Last line effect". It describes a pattern I've once noticed: in most cases programmers make an error in the last line of similar text blocks. Now I want t…
PVS-Studio for Java

Date: 01.17.2019

Author: Andrey Karpov

In the seventh version of the PVS-Studio static analyzer, we added support of the Java language. It's time for a brief story of how we've started making support of the Java language, how far we've co…
Characteristics of PVS-Studio Analyzer by the Example of EFL Core Libraries, 10-15% of False Positives

Date: 07.31.2017

Author: Andrey Karpov

After I wrote quite a big article about the analysis of the Tizen OS code, I received a large number of questions concerning the percentage of false positives and the density of errors (how many erro…
The Last Line Effect

Date: 05.31.2014

Author: Andrey Karpov

I have studied many errors caused by the use of the Copy-Paste method, and can assure you that programmers most often tend to make mistakes in the last fragment of a homogeneous code block. I have ne…
The Ultimate Question of Programming, Refactoring, and Everything

Date: 04.14.2016

Author: Andrey Karpov

Yes, you've guessed correctly - the answer is "42". In this article you will find 42 recommendations about coding in C++ that can help a programmer avoid a lot of errors, save time and effort. The au…
PVS-Studio ROI

Date: 01.30.2019

Author: Andrey Karpov

Occasionally, we're asked a question, what monetary value the company will receive from using PVS-Studio. We decided to draw up a response in the form of an article and provide tables, which will sho…
The way static analyzers fight against false positives, and why they do it

Date: 03.20.2017

Author: Andrey Karpov

In my previous article I wrote that I don't like the approach of evaluating the efficiency of static analyzers with the help of synthetic tests. In that article, I give the example of a code fragment…

Comments (0)

Next comments

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
This website uses cookies and other technology to provide you a more personalized experience. By continuing the view of our web-pages you accept the terms of using these files. If you don't want your personal data to be processed, please, leave this site.
Learn More →
Accept