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artdag: Phase 7 cost-directed opt-improvement/opt-cheaper? + 5 tests

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artdag/opt-improvement compares the original output cone (dce to id) vs the
maude-reduced DAG under an injected cost-fn, returning before/after total-work and
critical-path. opt-cheaper? asserts optimisation never increases cost: the 5-node
chain drops to 2 (work 5->2, path 5->2) and stays cheaper under radius-weighted cost
(5->3); over dedup and untouched DAGs are never pessimised. Consumes cost.sx. Phase 7
base + (later) cost box done. maude-optimize 38/38, total 196/196.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-06-19 13:57:13 +00:00
parent 81cba2cb52
commit d7bb3303f8
5 changed files with 80 additions and 7 deletions
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lib/artdag/scoreboard.md
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@@ -14,5 +14,5 @@ _Generated by `lib/artdag/conformance.sh`_
| serialize | 13 | 0 | 13 |
| stats | 12 | 0 | 12 |
| fault | 14 | 0 | 14 |
| maude-optimize | 33 | 0 | 33 |
| **Total** | **191** | **0** | **191** |
| maude-optimize | 38 | 0 | 38 |
| **Total** | **196** | **0** | **196** |