THE FEUTEX TOOLKIT

SIMD Tail Lane Utilization

Count vector iterations and inactive lanes in a final masked vector.

Developer workspace● Runs in your browser

01 Your input

ElementselementsVector lane countlanes

02 Your result

View or copy raw result data

Result data

Formula

Vector iterations = Math.ceil(n/width); Inactive final lanes = Math.ceil(n/width)*width-n; Lane utilization = 100*n/(Math.ceil(n/width)*width)

Made for real tasks

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

Enter elements, vector lane count in the displayed units.
Calculate the scenario, then compare it with measurements before changing a system.

{
  "n": 1000,
  "width": 16
}

Uniform work and masked final vector; does not predict instruction throughput or branch divergence.

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.