• 2019 Update 4
  • 03/20/2019
  • Public Content


For all memory address spaces, to optimize performance, a kernel must access data in at least 32-bit quantities, from addresses that are aligned to 32-bit boundaries. A 32-bit quantity can consist of any type, for example:
  • char4s
  • ushort2s
  • ints
These data types can be accessed with identical memory performance. If possible, access up to four 32-bit quantities (
, etc) at a time to improve performance. Accessing more than four 32-bit quantities at a time may reduce performance.

Product and Performance Information


Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804