Intel® 64 Architecture x2APIC Specification

  • File: 64-architecture-x2apic-specification.pdf
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Extensions to the xAPIC architecture are intended primarily to increase processor addressability. The x2APIC architecture provides backward compatibility to the xAPIC architecture and forward extendability for future Intel platform innovations.

For all Intel® 64 and IA-32 Architectures Software Developer Manuals, see:

For more complete information about compiler optimizations, see our Optimization Notice.