swiftperf

Swift performance notes, small examples, and swiftperf-lint (Swift Package).

Part of XPerf. Shared docs: docs/README.md. The lint is corpus-ready for the 2026-10-22 rules (AGENT.md G3). Defaults: sp-array-no-reserve hint; sp-print-hot off. Force-unwrap, string +=, and map/joined were removed after local swiftc -O runs. Three later hints (sp-dateformatter-hot, sp-json-decode-hot, sp-regex-hot) are outside that verdict. Guide v0 scaffold; text-lint parity when Swift SDK is absent.

Toolchain: swift may be missing from the machine you run on. Sources + Package.swift ship anyway; build with Swift 5.9+ when available. Fixtures and docs are complete without compiling.

ContentsCopy Anchor Link

• English guide (v0) — from docs/guide-src/
• swiftperf-lint — sp-array-no-reserve through the hot-call hints (sp-array-no-reserve and the 2026-10-23 hot-call rules hint; print off)
• Corpus pins

FocusCopy Anchor Link

Force-unwrap in hot loops, string concatenation growth, and hot print. Claims without a local bench stay provisional.

Run lintCopy Anchor Link

cd packages/swiftperf/swiftperf-lint
swift build -c release
"$(swift build -c release --show-bin-path)/swiftperf-lint" path/to/sources
bash ../scripts/smoke-lint.sh

Without Swift: scripts/smoke-lint.sh runs G0 via scripts/text-lint.cjs (heuristic parity with SPM sources). Corpus G2/G3 used the same fallback — see docs/corpus.md. corpus-ready: yes (text-lint parity; re-verify with SPM when a Swift toolchain is available).

LayoutCopy Anchor Link

docs/guide-src/   chapter sources
docs/             assembled guide + corpus.md + evidence-policy.md
evidence/         blocked stubs (no JSONL until a Swift toolchain is available)
examples/         tiny Swift demos
swiftperf-lint/   Package.swift + Sources + fixtures
scripts/          smoke-lint.sh, self-lint.sh, text-lint.cjs (fallback without swift)