UPSTREAM PR #2448: Use GIX_TEST_FIXTURE_HASH for gix-refspec

[loci-dev]

Note

Source pull request: GitoxideLabs/gitoxide#2448

This PR adds sha256 support to gix-refspec tests. It adds the sha256 feature flag to dev-dependencies and runs the test suite for gix-refspec for both sha1 and sha256. It adds separate branches for SHA-256 in a few places where SHA-1 hashes were hardcoded.

Open questions

• gix-refspec/tests/fixtures/generated-archives/.gitignore includes /match_baseline.tar. Does it also need to include /match_baseline_sha256.tar? (I haven’t committed the latter yet.)
• gix_refspec::parse::function::looks_like_object_hash uses gix_hash::Kind::shortest. Does it need to be changed? (I suspect it doesn’t.)

[loci-review]

Overview

Analysis of 26,403 functions across two Gitoxide binaries reveals negligible performance impact between versions. Modified functions: 32 (0.12%), new: 124, removed: 124, unchanged: 26,123 (98.94%). Power consumption increased 0.004% for both target.aarch64-unknown-linux-gnu.release.ein (295,790.55 nJ → 295,802.25 nJ) and target.aarch64-unknown-linux-gnu.release.gix (801,362.35 nJ → 801,392.32 nJ). Only one function met analysis thresholds, showing minor improvement. Commits focused on test infrastructure (hash algorithm selection for test fixtures), with no production code changes affecting performance-critical paths.

Function Analysis

The parse_from function in ein binary showed throughput improvement of 4.58% (157.54ns → 150.34ns, -7.20ns) with negligible response time change of 0.0044% (62.396ms → 62.398ms, +2.776μs). This clap-generated command-line parser executes once at startup before Git operations. No source code changes detected; the variation results from compiler optimization differences in the rebuild. The function is not performance-critical and has no impact on core Git operations (object database, pack operations, diffing, status computation).

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[loci-review]

No summary available at this time. Visit Loci Inspector to review detailed analysis.

[loci-review]

No meaningful performance changes were detected across 26512 analyzed functions in the following binaries: target.aarch64-unknown-linux-gnu.release.gix, target.aarch64-unknown-linux-gnu.release.ein.

🔎 Full breakdown: Loci Inspector
💬 Questions? Tag @loci-dev