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Prove least padding and greatest aligned predecessors - #3829

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Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho
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@joshlf

@joshlf joshlf commented Oct 8, 2026 •

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Strengthen the initial arithmetic specs from bounds to exact behavior.
For power-of-two alignments, prove the least padding that reaches an
aligned length and the greatest aligned value no larger than the input.
Strengthen extrema with their input-selection and ordering properties.

Preserve broader raw arithmetic lemmas and derive mathematical-model
contracts and caller corollaries from them. Add total Rust assertion
harnesses comparing the bitwise implementation with independent division
and remainder calculations. Their visible alignment guard leaves every
machine length, including usize::MAX, in the supported domain.

Authored by an AI agent acting on joshlf's behalf.


Latest Update: v31 — Compare vs v30

📚 Full Patch History

Links show the diff between the row version and the column version.

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git fetch origin refs/heads/Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho && git checkout -b pr-Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho FETCH_HEAD

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📝 Code Review ✅ Completed 2026-10-08T10:22:29.536361Z 95cbaec PR opened
🔒 Security Review ✅ Completed 2026-10-08T10:22:43.144556Z 95cbaec PR opened
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This was referenced Oct 8, 2026
@joshlf
joshlf force-pushed the Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho branch from 95cbaec to 87bd529 Compare October 9, 2026 00:08
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Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (Gmokoduvrhwmesqj7moerqxqv6jjz63e5@d92dd16). Learn more about missing BASE report.

Files with missing lines Patch % Lines
zerocopy/src/util/checks.rs 0.00% 9 Missing ⚠️
Additional details and impacted files
@@                         Coverage Diff                          @@
##             Gmokoduvrhwmesqj7moerqxqv6jjz63e5    #3829   +/-   ##
====================================================================
  Coverage                                     ?   59.23%           
====================================================================
  Files                                        ?       26           
  Lines                                        ?     3883           
  Branches                                     ?        0           
====================================================================
  Hits                                         ?     2300           
  Misses                                       ?     1583           
  Partials                                     ?        0           

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@joshlf
joshlf force-pushed the Gmokoduvrhwmesqj7moerqxqv6jjz63e5 branch from 2418828 to 26ca61a Compare October 9, 2026 02:21
@joshlf
joshlf force-pushed the Gmokoduvrhwmesqj7moerqxqv6jjz63e5 branch from 1e68811 to d2b9611 Compare October 15, 2026 00:40
@joshlf
joshlf force-pushed the Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho branch from 4d2b77a to 7212305 Compare October 15, 2026 00:40
@joshlf
joshlf force-pushed the Gmokoduvrhwmesqj7moerqxqv6jjz63e5 branch from d2b9611 to e0a8785 Compare October 15, 2026 01:19
@joshlf
joshlf force-pushed the Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho branch from 7212305 to 75f7f2a Compare October 15, 2026 01:19
@joshlf
joshlf force-pushed the Gmokoduvrhwmesqj7moerqxqv6jjz63e5 branch from e0a8785 to e111e75 Compare October 15, 2026 04:53
@joshlf
joshlf force-pushed the Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho branch from 75f7f2a to d78b050 Compare October 15, 2026 04:53
@joshlf
joshlf force-pushed the Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho branch from d78b050 to 6bab69e Compare October 15, 2026 14:22
@joshlf
joshlf force-pushed the Gmokoduvrhwmesqj7moerqxqv6jjz63e5 branch from e111e75 to 329aeac Compare October 15, 2026 14:22
Strengthen the initial arithmetic specs from bounds to exact behavior.
For power-of-two alignments, prove the least padding that reaches an
aligned length and the greatest aligned value no larger than the input.
Strengthen extrema with their input-selection and ordering properties.

Preserve broader raw arithmetic lemmas and derive mathematical-model
contracts and caller corollaries from them. Add total Rust assertion
harnesses comparing the bitwise implementation with independent division
and remainder calculations. Their visible alignment guard leaves every
machine length, including usize::MAX, in the supported domain.

gherrit-pr-id: Gcqu6kiltuj5regk4e2yhgquvd5vqi7ho
Agent-authored-by: AI agent acting on joshlf's behalf

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