rust-bench #40

	name: rust-bench

	on:
	schedule:
	# Nightly at 06:00 UTC — runs criterion against main and compares to baseline.
	- cron: '0 6 * * *'
	workflow_dispatch:

	env:
	CARGO_TERM_COLOR: always

	jobs:
	bench:
	name: criterion (ubuntu-latest)
	runs-on: ubuntu-latest
	permissions:
	contents: read

	steps:
	- uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
	with:
	persist-credentials: false

	- name: Cache cargo registry & target
	uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
	with:
	path: \|
	~/.cargo/registry
	~/.cargo/git
	target
	key: cargo-bench-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}

	# Bench harnesses (criterion) land in crates that have a `benches/`
	# directory: bignum, logic, save. Workspace bench is a no-op until
	# those are wired.
	- name: cargo bench (dry)
	run: cargo bench --workspace --no-run

	# Once criterion benches exist, swap the dry run for:
	# cargo bench --workspace -- --output-format bencher
	# and pipe the JSON through a small formatter (mirrors the TS
	# `bench-report.mjs` in legacy/core_split) to produce BENCH_REPORT.md.

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