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- Since AMD64 and Intel 64 are substantially similar, many software and hardware products use one vendor-neutral term to indicate their compatibility with both implementations. AMD’s original designation for this processor architecture, “x86-64”, is still sometimes used for this purpose, as is the variant “x86_64”. Other companies, such as Microsoft and Sun Microsystems/Oracle Corporation, use the contraction “x64” in marketing material.
- The term IA-64 refers to the Itanium processor, and should not be confused with x86-64, as it is a completely different instruction set.
- Many operating systems and products, especially those that introduced x86-64 support prior to Intel’s entry into the market, use the term “AMD64” or “amd64” to refer to both AMD64 and Intel 64.
- Most BSD systems such as FreeBSD, MidnightBSD, NetBSD and OpenBSD refer to both AMD64 and Intel 64 under the architecture name “amd64”.
- Some Linux distributions such as Debian, Ubuntu, Gentoo Linux refer to both AMD64 and Intel 64 under the architecture name “amd64”.
- Microsoft Windows’s x64 versions use the AMD64 moniker internally to designate various components which use or are compatible with this architecture. For example, the environment variable PROCESSOR_ARCHITECTURE is assigned the value “AMD64” as opposed to “x86” in 32-bit versions, and the system directory on a Windows x64 Edition installation CD-ROM is named “AMD64”, in contrast to “i386” in 32-bit versions.
- Sun’s Solaris’ isalist command identifies both AMD64- and Intel 64-based systems as “amd64”.
- Java Development Kit (JDK): the name “amd64” is used in directory names containing x86-64 files.
- The Linux kernel and the GNU Compiler Collection refers to 64-bit architecture as “x86_64”.
- Some Linux distributions, such as Fedora, openSUSE, Arch Linux, Gentoo Linux refer to this 64-bit architecture as “x86_64”.
- Apple macOS refers to 64-bit architecture as “x86-64” or “x86_64”, as seen in the Terminal command arch and in their developer documentation.
- Breaking with most other BSD systems, DragonFly BSD refers to 64-bit architecture as “x86_64”.
- Haiku refers to 64-bit architecture as “x86_64”.
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