twnming的专栏

  MMX Extensions OverviewWith the release of the Athlon in 1999, AMD extended the standard MMX instruction set with some new instructions. These instructions provide some enhanced conversion and s

IntroductionIntel Pentium 4 processor includes support for additional set of single instruction multiple data (SIMD) commands. What is SIMD? Its a way of getting your CPU to do more work with less

  AltiVec — An OverviewAltiVec is a SIMD instruction set developed by Apple around 1998. It is a floating-point instruction set used in PowerPC microprocessors. It operates on 32-bit floating poin

  SSE4 — An OverviewSSE4 was formally announced on September 27th, 2006, and became available in hardware in early 2007 for both Intel and AMD processors. Earlier hints were available, but were in

  SSE — An OverviewSSE is a newer SIMD extension to the Intel Pentium III and AMD AthlonXP microprocessors. Unlike MMX and 3DNow! extensions, which occupy the same register space as the normal FPU

  Cyrix EMMX Instructions — OverviewIn 1997, Cyrix extended Intels MMX Instruction set with their own variation, called EMMX. This extension introduced Implied Destination registers, allowing som

  MMX — An OverviewMMX was the first set of SIMD extensions applied to Intels 80x86 instruction set. It was introduced in 1997. MMX introduces a number of new instructions that operate on single

 SIMD (Single Instruction, Multiple Data). SIMD describes any extension to microprocessors that allow it to operate on data in parallel. Some common SIMD extensions are MMX, 3DNow!, SSE, and AltiVec (

  SSSE3 — An IntroductionWith Intels Core 2 architecture, a few new instructiosn were added to the SSE3 collection. These were mistakenly called SSE4 at times while under development, and are als

  SSE3 — An OverviewSSE3 was introduced by Intel in early 2004 with their Prescott revision of the Pentium 4 CPU. SSE3 adds only 13 new instructions, but allows for new features such as horizontal

  SSE 2 — An OverviewSSE2 was first introduced on the Intel Pentium 4, and are also known sometimes as "Willamette" instructions. These instructions are very similar to the SSE instructions in str

  3DNow! — ExtensionsWhen AMD released their Athlon processor in 1999, they also took the liberty to extend their 3DNow! instruction set with a few new instructions. They basically provide a few m

  3DNow! — An Overview3DNow! was AMDs logical extension to Intels MMX. While MMX only provided parallel integer operations, 3DNow! addressed the need for parallel floating point operation. It wa

  CPUIDcpuid is an instruction added to Intel Pentiums (and some later 80486s) that enables programmers to determine what kind of features the current CPU supports, who made it, various extension