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Fix garbled result produced by CosetLeadersMatFFE#6325

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fingolfin wants to merge 1 commit intomasterfrom
codex/issue-5923
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Fix garbled result produced by CosetLeadersMatFFE#6325
fingolfin wants to merge 1 commit intomasterfrom
codex/issue-5923

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@fingolfin fingolfin commented Apr 16, 2026

When invoked on compressed matrices over small finite fields, CosetLeadersMatFFE sometimes would produce incorrect output with gaps in it (i.e., undefined entries)

AI assistance: Codex investigated the 8-bit fast path, added a regression test, and prepared the fix.

Co-authored-by: Codex codex@openai.com

Fixes #5923

CC @osj1961

@fingolfin fingolfin added kind: bug Issues describing general bugs, and PRs fixing them kind: bug: wrong result Issues describing bugs that result in mathematically or otherwise wrong results, and PRs fixing them topic: library release notes: use title For PRs: the title of this PR is suitable for direct use in the release notes labels Apr 16, 2026
When invoked on compressed matrices over small finite fields,
CosetLeadersMatFFE sometimes would produce incorrect output
with gaps in it (i.e., undefined entries)

AI assistance: Codex investigated the 8-bit fast path,
added a regression test, and prepared the fix.

Co-authored-by: Codex <codex@openai.com>
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kind: bug: wrong result Issues describing bugs that result in mathematically or otherwise wrong results, and PRs fixing them kind: bug Issues describing general bugs, and PRs fixing them release notes: use title For PRs: the title of this PR is suitable for direct use in the release notes topic: library

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