PowerPC


PowerPC
PowerPC logo.svg
DesignerAIM
Bits32-bit/64-bit (32 → 64)
IntroducedOctober 1992 (1992-10)
Version2.02[1]
DesignRISC
TypeLoad–store
EncodingFixed/Variable (Book E)
BranchingCondition code
EndiannessBig/Bi
ExtensionsAltiVec, APU
Registers
General purpose32
Floating point32
Vector32 (with AltiVec)
IBM PowerPC 601 microprocessor

PowerPC (with the backronym Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer (RISC) instruction set architecture (ISA) created by the 1991 AppleIBMMotorola alliance, known as AIM. PowerPC, as an evolving instruction set, has since 2006 been named Power ISA, while the old name lives on as a trademark for some implementations of Power Architecture–based processors.

PowerPC was the cornerstone of AIM's PReP and Common Hardware Reference Platform initiatives in the 1990s. Originally intended for personal computers, the architecture is well known for being used by Apple's Power Macintosh, PowerBook, iMac, iBook, and Xserve lines from 1994 until 2006, when Apple migrated to Intel's x86. It has since become a niche in personal computers, but remains popular for embedded and high-performance processors. Its use in 7th generation of video game consoles and embedded applications provided an array of uses, including satellites, and the Curiosity and Perseverance rovers on Mars. In addition, PowerPC CPUs are still used in AmigaOne and third party AmigaOS 4 personal computers.

PowerPC is largely based on IBM's earlier POWER instruction set architecture, and retains a high level of compatibility with it; the architectures have remained close enough that the same programs and operating systems will run on both if some care is taken in preparation; newer chips in the POWER series use the Power ISA.

  1. ^ "PowerPC Architecture Book, Version 2.02". November 16, 2005. Archived from the original on November 29, 2020.

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