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korniakornia/kornia-rs/.claude/skills/kornia-simd/SKILL.md

kornia-simd

Skill748 starsChanged 7 days agoApache-2.0View on GitHub

Use when adding or optimizing SIMD (NEON/AVX2) or performance-critical kernels in kornia-imgproc — module layout, dispatch, cross-arch testing, benchmarking and correctness-vs-scalar checks. Trigger on "SIMD", "NEON", "AVX2", "benchmark", "speed up".

We split this skill into the rules it gives an agent

4 rules. About 0 are common, 2 are distinctive, and 2 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈2

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 2

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Always keep a scalar fallback.

    line 20
  2. Very specific:

    Every unsafe intrinsic block has // SAFETY:.

    line 21
  3. Very specific:

    Test cross-arch with qemu/binfmt as described in SIMD.md or pixi run rust-cross-test-aarch64.

    line 25
  4. Distinctive:

    Avoid allocations in hot paths.

    line 30

≈ “Common” is an estimate: at least 1 in 5 of the 308,232 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

SIMD / performance in kornia-imgproc

The authoritative guide is crates/kornia-imgproc/SIMD.md; read it first.

Layout

  • Multi-kernel op: subdirectory with mod.rs (public Image API + sealed-trait dispatch) and kernels.rs (slice-level NEON/AVX2/scalar). Canonical example: crates/kornia-imgproc/src/color/gray/.
  • Single-dtype op: a flat .rs file is fine.
  • Shared helpers live in crates/kornia-imgproc/src/simd/ and parallel.rs.

Rules

  • Always keep a scalar fallback; SIMD output must match scalar (assert in tests).
  • Every unsafe intrinsic block has // SAFETY:; gate with #[cfg(target_arch = ...)]; runtime dispatch reads crate::simd::cpu_features(), never is_x86_feature_detected! directly (it is compile-time-sensitive under -Ctarget-cpu, see SIMD.md).
  • Test cross-arch with qemu/binfmt as described in SIMD.md or pixi run rust-cross-test-aarch64.
  • Benchmark before and after (cargo bench, best-of-N rounds). Report numbers in the PR. iai-callgrind runner version must exactly match the iai-callgrind dev-dependency version.
  • Avoid allocations in hot paths; mind rayon row chunking.

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