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

Request our prices
New License
License Renewal
--Select currency--
USD
EUR
RUB
* By clicking this button you agree to our Privacy Policy statement

Free PVS-Studio license for Microsoft MVP specialists
* By clicking this button you agree to our Privacy Policy statement

To get the licence for your open-source project, please fill out this form
* By clicking this button you agree to our Privacy Policy statement

I am interested to try it on the platforms:
* By clicking this button you agree to our Privacy Policy statement

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.

>
>
Why is it so hard to create a 64-bit ve…

Why is it so hard to create a 64-bit version of an application?

Feb 10 2011
Author:

Unfortunately, despite the seeming simplicity, it is often not enough just to rebuild a 32-bit program for a 64-bit platform and fix compiler errors to provide assured operability of the application being ported. The main issue of migrating to 64 bits is the presence of hidden 64-bit errors, i.e. cases when a code fragment that worked correctly in the 32-bit version causes errors in the 64-bit version.

Most often 64-bit errors occur in the following code fragments:

  • code based on incorrect assumptions about types' sizes (for instance, on the assumption that the pointer's size is always 4 bytes);
  • code processing large arrays whose sizes exceed 2 Gbytes in 64-bit systems;
  • code writing and reading data;
  • code containing bit operations;
  • code with complex address arithmetic;
  • obsolete code;

You may read a detailed description of each error type in the article A Collection of Examples of 64-bit Errors in Real Programs. Although all the errors in code that reveal themselves while compiling the program for 64-bit systems are related to inaccurate compliance with C/C++ standards, no real project is secure from them.

Another issue of moving to a 64-bit platform is dependence of your application on the libraries that do not have 64-bit versions since combined use of a 64-bit program and a 32-bit library is impossible in Windows systems.

A detailed description of the migration process and estimate of time and cost of porting an application to a 64-bit platform are given in this article.

References

Popular related articles
macOS 10.15 no longer supports 32-bit apps. What can you do?

Date: Oct 15 2019

Author: Sergey Khrenov

On October 7, 2019, Apple released a new version of its Mac operating system, macOS Catalina. Version 10.15 contains many changes and improvements. One of the significant is the complete phasing out …
If the coding bug is banal, it doesn't mean it's not crucial

Date: Apr 19 2017

Author: Andrey Karpov

Spreading the word about PVS-Studio static analyzer, we usually write articles for programmers. However, some things are seen by programmers quite one-sided. That is why there are project managers wh…
Detecting Overflows of 32-Bit Variables in Long Loops in 64-Bit Programs

Date: Mar 22 2016

Author: Andrey Karpov

One of the problems that 64-bit software developers have to face is overflows of 32-bit variables in very long loops. PVS-Studio code analyzer is very good at catching issues of this type (see the Vi…
Is it possible to run 64-bit applications in a 32-bit OS?

Date: Dec 08 2015

Author: Andrey Karpov

Nowadays 64-bit operating systems are very widespread. But 32-bit OS are still present on the market, in quite obvious quantities. A lot of modern program tools are developed to be run only in 64-bit…
How to Port a 9 Million Code Line Project to 64 bits?

Date: Aug 03 2015

Author: Evgeniy Ryzhkov, Ilya Ivanov

Our team has recently finished porting one pretty large project (9 million code lines, 300 Mbytes of source files) to the 64-bit platform. It took us one year and a half. Although we are not permitte…

Comments (0)

Next comments
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