Home/ Questions/Q 9177899
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-17T17:25:56+00:00

Intel® 64 and IA-32 Architectures Optimization Reference Manual lists latency and throughput figures for

  • 0

Intel® 64 and IA-32 Architectures Optimization Reference Manual lists latency and throughput figures for various CPU instructions.

For transcendental functions (FSIN etc) some of the figures are listed as ranges (page C-29). Footnote 4 explains:

Latency and Throughput of transcendental instructions can vary substantially in a dynamic execution environment. Only an approximate value or a range of values are given for these instructions.

My question is: what factors affect the throughput and latency of such instructions? I imagine the value of the argument is one factor. Are there any other?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Besides the argument, the mix of other instructions that are in flight may have an effect on the latency and throughput. These instructions are microcoded, which means they generate a sequence of µops which need to contend with other instructions for ALU resources; in case of such contention, performance may be adversely effected.

    • 0