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. Therefore the programmer is responsible for using CPUID to detect the processor and generating 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.