X86-64 - Industry Naming Conventions

Industry Naming Conventions

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.

  • BSD systems such as FreeBSD, MidnightBSD, NetBSD and OpenBSD refer to both AMD64 and Intel 64 under the architecture name "amd64".
  • The Linux kernel and DragonFly BSD refers to 64-bit architecture as "x86_64".
  • Debian, Ubuntu, and Gentoo refer to both AMD64 and Intel 64 under the architecture name "amd64".
  • The GNU Compiler Collection, Fedora, PackageKit, openSUSE, and Arch Linux refer to this 64-bit architecture as "x86_64".
  • Haiku: refers to 64-bit architecture as "x86_64".
  • Java Development Kit (JDK): the name "amd64" is used in directory names containing x86-64 files.
  • OS X: Apple refers to 64-bit architecture as "x86-64" or "x86_64", as noted with the Terminal command arch and in their developer documentation.
  • Microsoft Windows: x64 versions of Windows use the AMD64 moniker internally to designate various components which use or are compatible with this architecture. For example, the system directory on a Windows x64 Edition installation CD-ROM is named "AMD64", in contrast to "i386" in 32-bit versions.
  • Solaris: the isalist command in Sun's Solaris operating system identifies both AMD64- and Intel 64-based systems as "amd64".
  • T2 SDE refers to both AMD64 and Intel 64 under the architecture name "x86-64", in source code directories and package meta information.

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