User Guide

  • 2020
  • 06/18/2020
  • Public Content

Slow LEA Stalls

Metric Description

Some instructions have increased latency in Intel microarchitecture code name Sandy Bridge. Some LEA instructions, most notably three-operand LEA instructions, have increased latency and reduced dispatch port choices compared to other LEAs. This metric estimates the performance penalty of such slow LEAs.

Possible Issues

A significant proportion of cycles were spent handling slow LEA operations. Use the source view to discover the responsible instructions and try to avoid their use.

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