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The Unabridged Pentium 4 IA32 Processor Genealogy by Bob Colwell, Tom Shanley

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The Foundation

Refer to Table 56-1 on page 1322. From a software perspective, the Pentium® 4 processor is the sum of all of the IA32 software architectural features that have been introduced since the 386 processor.

Table 56-1. The Elements of the Software Architecture
ElementRefer to
The instruction setThe IA32 instruction set has grown over the years. A description of the instructions (in order of introduction) can be found in:
  • The 386 instruction set can be found in “Instruction Set Evolution” on page 115 on the CD.

  • The 486 instruction set additions and/or changes are described in “Instruction Set Changes” on page 456.

  • The Pentium® instruction set additions and/or changes are described in “Instruction Set Changes” on page 517.

  • The Pentium® Pro ...

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