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fdlibm

Last updated 2026-07-13 · benchmark measured 2026-08-12 — deterministic & reproducible

fdlibm is a C library of standard mathematical functions from Netlib.

Is fdlibm production-ready?

Legit.Show scores fdlibm 34 out of 100 — the simple average of its 6 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on fdlibm (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Reliability; its weakest is Standards. 6 of the seven frames returned a score; Accessibility was not measurable on this service and is recorded as null — not as zero. Every frame it averages is published with its evidence on the Legit.Show listing.

The 7 Frames

• Performance — 60/100
• Accessibility — not measurable on this service (null — not scored as 0)
• Security — 30/100
• Privacy — 0/100
• Reliability — 100/100
• Standards — 0/100
• Discoverability — 15/100

What we measured

• Security headers present: HSTS.
• No Content-Security-Policy.
• Served over HTTPS with a valid certificate.
• Real Lighthouse performance run — 376 ms to first byte.
• Returns a proper 404 for unknown routes.
• 1 of 1 sampled routes reachable.
• No privacy policy found.
• Sets cookies / loads scripts with no consent prompt.

Who it's for

C developers · Systems programmers · Mathematical software developers · Embedded systems engineers

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