Editing 64-bit computing (section)

== Current 64-bit architectures ==
{{Unreferenced section|date=April 2023}}
{{As of|2023|08}}, 64-bit architectures for which processors are being manufactured include:

* The 64-bit extension created by [[Advanced Micro Devices]] (AMD) to Intel's [[x86]] architecture (later licensed by Intel); commonly termed ''[[x86-64]]'', ''AMD64'', or ''x64'':
** AMD's [[AMD64]] extensions (used in [[Athlon 64]], [[Opteron]], [[Sempron]], [[Turion 64]], [[Phenom (processor)|Phenom]], [[Athlon II]], [[Phenom II]], [[AMD Accelerated Processing Unit|APU]], [[AMD FX|FX]], [[Ryzen]], and [[Epyc]] processors)
** [[Intel]]'s [[Intel 64]] extensions, used in [[Intel Core]] 2/i3/i5/i7/i9, some [[Intel Atom|Atom]], and newer [[Celeron]], [[Pentium]], and [[Xeon]] processors
*** [[Intel]]'s K1OM architecture<!-- dead? And Knights Corner? At Least Xeon Phi is dead -->, a variant of ''Intel 64'' with no CMOV, MMX, and SSE instructions, used in first-generation [[Xeon Phi]] (Knights Corner) coprocessors, binary incompatible with x86-64 programs
** [[VIA Technologies]]' 64-bit extensions, used in the [[VIA Nano]] processors
* [[ARM Holdings]]' [[AArch64]] architecture
* IBM's [[PowerPC]]/[[Power ISA]]:
** IBM's [[Power10]] processor and predecessors, and the [[IBM A2]] processors
* IBM's [[z/Architecture]], a 64-bit version of the [[ESA/390]] architecture, used in IBM's [[IBM Z]] [[IBM mainframes|mainframes]]:
** [[IBM Telum (microprocessor)|IBM Telum]] II processor and predecessors
** [[Hitachi]] AP8000E <!-- dead? -->
* [[RISC-V]]
* [[SPARC]] V9 architecture:
** [[Oracle Corporation|Oracle]]'s M8 and S7 processors and predecessors
** [[Fujitsu]]'s SPARC64 XII and [[SPARC64 V#SPARC64 XIfx|SPARC64 XIfx]] processors and predecessors
* [[MIPS Technologies]]' [[MIPS architecture|MIPS64]] architecture<!-- For sure still made? mips.com mentions RISC-V being made. Missing here Longsoon, but it no longer MIPS based? -->
* [[NEC SX architecture]]
** [[SX-Aurora TSUBASA]]<!-- Also dead? -->
* [[Elbrus (computer)|Elbrus]] architecture:<!-- Maybe also dead? -->
** [[Elbrus-8S]]
* [[ARC (processor)|ARC]]<!-- Dead? Now doing RISC-V ARC-V-. -->

Most architectures of 64 bits that are derived from the same architecture of 32 bits can execute code written for the 32-bit versions natively, with no performance penalty.{{Citation needed|date=September 2010}} This kind of support is commonly called ''bi-arch support'' or more generally ''multi-arch support''.