Comprehensive interaction testing with single binary, ENV-only configuration:
4-Point Matrix Results (Mixed SSOT, WS=400):
- Point A (C5=0, C6=0): 42.36 M ops/s [Baseline]
- Point B (C5=1, C6=0): 43.54 M ops/s (+2.79% vs A)
- Point C (C5=0, C6=1): 44.25 M ops/s (+4.46% vs A)
- Point D (C5=1, C6=1): 44.65 M ops/s (+5.41% vs A) **[COMBINED TARGET]**
Additivity Analysis:
- Expected additive: 45.43 M ops/s (B+C-A)
- Actual: 44.65 M ops/s (D)
- Sub-additivity: 1.72% (near-perfect, minimal negative interaction)
Perf Stat Validation (Point D vs A):
- Instructions: -6.1% (function call elimination confirmed)
- Branches: -6.1% (matches instructions reduction)
- Cache-misses: -31.5% (improved locality, NO code explosion)
- Throughput: +5.41% (net positive)
Decision: ✅ STRONG GO (exceeds +3.0% GO threshold)
- D vs A: +5.41% >> +3.0%
- Sub-additivity: 1.72% << 20% acceptable
- Phase 73 hypothesis validated: -6.1% instructions/branches → +5.41% throughput
Promotion to Defaults:
- core/bench_profile.h: C5+C6 added to bench_apply_mixed_tinyv3_c7_common()
- scripts/run_mixed_10_cleanenv.sh: C5+C6 ENV defaults added
- C5+C6 inline slots now PRESET DEFAULT for MIXED_TINYV3_C7_SAFE
New Baseline: 44.65 M ops/s (36.75% of mimalloc, +5.41% from Phase 75-0)
M2 Target: 55% of mimalloc ≈ 66.8 M ops/s (remaining gap: 22.15 M ops/s)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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