OpenCL™ Developer Guide for Intel® Core™ and Intel® Xeon® Processors

  • 10/30/2018
  • Public Content
Contents

Use Array Notation with int32 Indices: A[i][j]

Prefer the array notation with indices of the signed
int32
 type over other memory access formats. Avoid explicit pointer arithmetic like (A+1) as it results in expensive unsigned
int64
 calculations and prevents various compiler optimizations. To gain performance, access any array through its unchanged base pointer using array notation, for example, A[1].

Product and Performance Information

1

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