[sylvestre]

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[github-actions]

GNU diffutils testsuite comparison:

Test results comparison:
  Current:   TOTAL: 33 / PASSED: 11 / FAILED: 18 / SKIPPED: 4
  Reference: TOTAL: 33 / PASSED: 8 / FAILED: 21 / SKIPPED: 4

Changes from main branch:
  TOTAL: +0
  PASSED: +3
  FAILED: -3

Test improvements (3):
  + binary
  + new-file
  + stdin

[codspeed]

Merging this PR will degrade performance by 9.11%

2 warnings

⚠️ 24 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

⚠️ 19 benchmarks with a significant change ran in a different software environment

Their base and head results were measured with a different OS or toolchain, such as compiler, runtime or library versions, so the changes might come from this difference rather than from the code. Open an affected benchmark to see what changed.

See affected benchmarks

⚡ 3 improved benchmarks
❌ 16 regressed benchmarks
✅ 7 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	cmd_diff_release_equal[25000]	24.1 µs	28.1 µs	-14.34%
❌	cmd_diff_gnu_equal[25000]	22.6 µs	26.3 µs	-14.16%
❌	cmd_diff_gnu_equal[10000]	22.7 µs	26.3 µs	-13.78%
❌	cmd_cmp_gnu_equal[25000]	22.6 µs	26 µs	-13.19%
❌	cmd_cmp_gnu_equal[10000]	22.7 µs	26 µs	-12.98%
❌	cmd_diff_gnu_equal[100]	22.2 µs	25.5 µs	-12.83%
❌	cmd_cmp_release_equal[25000]	24.2 µs	27.7 µs	-12.81%
❌	cmd_diff_gnu_equal[1000]	22.3 µs	25.5 µs	-12.41%
❌	cmd_cmp_release_equal[1000]	24.4 µs	27.8 µs	-12.22%
❌	cmd_diff_release_equal[1000]	24.4 µs	27.8 µs	-12.21%
❌	cmd_diff_release_equal[10000]	24 µs	27.3 µs	-11.99%
❌	cmd_cmp_release_equal[10000]	24.5 µs	27.7 µs	-11.61%
❌	cmd_diff_release_equal[100]	24.3 µs	27.4 µs	-11.24%
❌	cmd_cmp_gnu_equal[100]	22.4 µs	24.8 µs	-9.67%
❌	cmd_cmp_gnu_equal[1000]	22.5 µs	24.8 µs	-9.27%
❌	cmd_cmp_release_equal[100]	25.1 µs	27.6 µs	-9.17%
⚡	cmp_parser	12.4 µs	10.6 µs	+16.84%
⚡	diff_parser	6.1 ms	5.7 ms	+6.82%
⚡	cmp_compare_files_different[100]	79.2 µs	76.7 µs	+3.29%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing diff-stdin-dir (b5da98a) with diff-binary (b469e0a)¹}

Footnotes

1. No successful run was found on diff-binary (83ebbfc) during the generation of this report, so 04c5b6b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

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1 open issue

• Hard-coding /dev/fd/0 is not guaranteed to exist even on Linux/Android (e.g., minimal containers… · New

_{Review effort: Lite}