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+# Phase 14 v2: Pointer-Chase Reduction (Hot Path Integration) A/B Test Results
+
+**Date:** 2025-12-15
+**Benchmark:** Mixed (16–1024B) + C7-only (1025–2048B) 10-run cleanenv
+**Target:** Integrate tcache into tiny_front_hot_box alloc/free hot paths
+**Expected ROI:** +15-25% (design estimate from v1)
+**GO Threshold:** +1.0% mean improvement
+
+---
+
+## 1. Implementation Summary
+
+Phase 14 v2 integrates the intrusive LIFO tcache (implemented in v1) into the actual hot paths of `tiny_front_hot_box.h`.
+
+**Key Changes:**
+- **Patch 1**: Added `tiny_tcache_try_pop()` to `tiny_hot_alloc_fast()` (try tcache first, fall through to array cache on miss)
+- **Patch 2**: Added `tiny_tcache_try_push()` to `tiny_hot_free_fast()` (try tcache first, fall through to array cache on overflow)
+- **Makefile Fix**: Added missing `.o` files to `BENCH_HAKMEM_OBJS_BASE`
+- **LTO Fix**: Restored static inline for `tiny_c7_preserve_header_enabled()`
+
+**Design:**
+- v1 only integrated tcache into `unified_cache_push()` (free side only)
+- v2 integrates tcache into both alloc and free hot paths
+- This creates push/pop symmetry (tcache becomes "live" on both sides)
+
+**ENV Control:**
+```bash
+export HAKMEM_TINY_TCACHE=0  # Baseline
+export HAKMEM_TINY_TCACHE=1  # Optimized
+```
+
+---
+
+## 2. A/B Test Results
+
+### Mixed (16–1024B):
+- **Baseline (TCACHE=0):** 51,287,515 ops/s
+- **Optimized (TCACHE=1):** 51,330,213 ops/s
+- **Delta:** +0.08%
+
+### C7-only (1025–2048B):
+- **Baseline (TCACHE=0):** 80,975,651 ops/s
+- **Optimized (TCACHE=1):** 80,660,283 ops/s
+- **Delta:** -0.39%
+
+---
+
+## 3. Verdict: NEUTRAL
+
+**Result:** Mixed +0.08%, C7-only -0.39% (both below GO threshold)
+
+**Comparison to v1:**
+- v1: Mixed +0.20% (NEUTRAL)
+- v2: Mixed +0.08%, C7-only -0.39% (NEUTRAL, worse than v1)
+
+**Root Cause:**
+1. LIFO/FIFO mixing degrades cache locality
+2. Hot path branch overhead
+3. Cap=64 too small for high churn
+4. Intrusive pointers add overhead vs array cache
+
+---
+
+## 4. Recommendation: Freeze as Research Box
+
+**Decision:** Freeze Phase 14 (v1+v2) as research box (HAKMEM_TINY_TCACHE=0 default, OFF)
+
+**Next:** Phase 15 (UnifiedCache FIFO→LIFO) - optimize existing array cache structure instead of adding intrusive layers.