# 64\-bit \(64\-bit, x64\)

Within the framework of computer architecture by the term "64\-bit" we understand 64\-bit integers and other data types having the size of 64 bits\. By "64\-bit systems" we understand 64\-bit architectures of microprocessors \(for example, [EM64T](https://pvs-studio.com/en/blog/terms/0014/), [IA\-64](https://pvs-studio.com/en/blog/terms/0017/)\) or 64\-bit operating systems \(for example, Windows XP Professional x64 Edition\)\. We can speak about compilers generating 64\-bit program code or specialized tools performing test of 64\-bit code \(for example, [Viva64](https://pvs-studio.com/en/pvs-studio/)\)\.

## References

1. Andrey Karpov\. [64 bit](https://pvs-studio.com/en/blog/posts/cpp/0188/)\.
1. Wikipedia\. [64\-bit](https://en.wikipedia.org/wiki/64-bit_computing)\.
1. Wikipedia\. [Itanium](https://en.wikipedia.org/wiki/Itanium)\.
1. Wikipedia\. [AMD64](https://en.wikipedia.org/wiki/X86-64)\.
1. Evgeniy Ryzhkov, Andrey Karpov\. [AMD64 \(EM64T\) architecture](https://pvs-studio.com/en/blog/posts/a0029/)\.