User Guide



Metric Description

Not all arithmetic operations take the same amount of time. Divides and square roots, both performed by the DIV unit, take considerably longer than integer or floating point addition, subtraction, or multiplication. This metric represents cycles fraction where the Divider unit was active.

Possible Issues

The DIV unit is active for a significant portion of execution time.


Locate the hot long-latency operation(s) and try to eliminate them. For example, if dividing by a constant, consider replacing the divide by a product of the inverse of the constant. If dividing an integer, consider using a right-shift instead.

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