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`.fir`

1 claimant 1 primary 0 secondary unambiguous primary

SWH popularity

Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.

34.4K

total files

23.5K

first seen 2021–2025 (68.2%)

2022

median year (half its files since)

Case variants in archive: .fir (34.3K), .FIR (108), .Fir (3) — aggregated above.

Attribution status

This extension is attributed to FIRRTL as primary by 1 authoritative claim.

Authoritative sources: ✓ Linguist ✗ Pygments · no claim ✗ Wikidata · no claim ✗ Wikipedia · no claim

Disagree or have a correction? Open a labelling issue.

Claimants (1)

Languages that list .fir among their extensions. Strength reflects whether the upstream source treated it as their primary extension.

Language	Source	Strength
FIRRTL	linguist	primary

SWH-mined examples (2)

Real archived programs with this extension, byte-verified against the SWH archive, grouped by predicted language and by how the prediction was made. Useful for deciding what this extension actually is when the attribution is uncertain.

FIRRTL (2) — 2 via unique-primary

ZeroWidthIOModule.fir · 554 B · seen 16× in SWH

predicted: FIRRTL via unique-primary

swh:1:cnt:611ef9260fcdd91631d3859f0df075640bf02fb6;origin=https://github.com/comparch-security/chipyard-random-llc;anchor=swh:1:rev:fa843cfd41a55be03fa721e2495542925e878b87;path=/tools/treadle/samples/ZeroWidthIOModule.fir

Open in SWH · Raw bytes

FixedPointDivide.fir · 642 B · seen 16× in SWH

predicted: FIRRTL via unique-primary

swh:1:cnt:bd215be4eb34ddf0755025738283e228b174318e;origin=https://github.com/comparch-security/chipyard-random-llc;anchor=swh:1:rev:fa843cfd41a55be03fa721e2495542925e878b87;path=/tools/treadle/samples/FixedPointDivide.fir

Open in SWH · Raw bytes