Overview: Intrinsics Cross-processor Implementation

This section provides a series of tables that compare intrinsics performance across architectures. Before implementing intrinsics across architectures, please note the following.

• Instrinsics may generate code that does not run on all IA processors. You should therefore use CPUID to detect the processor and generate the appropriate code.
• Implement intrinsics by processor family, not by specific processor. The guiding principle for which family -- IA-32 or Itanium® processors -- the intrinsic is implemented on is performance, not compatibility. Where there is added performance on both families, the intrinsic will be identical.