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docs: tone down Phase 75-5 PGO recovery estimates

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2025-12-18 09:37:55 +09:00
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docs/analysis/PERFORMANCE_TARGETS_SCORECARD.md
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@ -149,8 +149,8 @@ Phase 75-3 validated C5+C6 inline slots optimization on Standard binary (+5.41%)
2. **HIGH PRIORITY - PHASE 75-5 (PGO Profile Regeneration)**
- Regenerate PGO profile with C5=1, C6=1 training configuration
- Expected gain: +5-8% (if profile aligns with actual code optimization)
- Estimated recovery: 55.51 M ops/s → ~58-59 M ops/s
- Expected gain: unknown (likely positive if the training profile matches the actual hot path, but not guaranteed)
- Estimated recovery: treat any number as a hypothesis until re-measured (do not assume a return to Phase 69 levels)
- Root cause analysis: Investigate 14% gap vs Phase 69 (layout, code bloat, or profile mismatch)
**Documentation:**

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docs/analysis/PHASE75_4_FAST_PGO_REBASE_RESULTS.md
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@ -6,7 +6,7 @@
**Key Finding**: C5+C6 inline slots optimization shows **+3.16% gain** on FAST PGO binary, meeting the ideal threshold but significantly lower than Standard's +5.41% gain.
**Critical Concern**: FAST PGO baseline is **7.16% slower** than Standard baseline, suggesting potential PGO profile staleness or suboptimal training conditions.
**Critical Concern**: FAST PGO baseline is **7.16% slower** than Standard baseline, suggesting potential PGO profile staleness, training mismatch, or build/layout drift.
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@ -155,7 +155,7 @@
3. **⚠ Regenerate PGO Profile**
- Train with C5=1, C6=1 (optimized config)
- Use Phase 75 codebase for profiling
- Expected result: close gap to Standard baseline
- Expected result: uncertain; likely to improve if PGO was mismatched, but not guaranteed
4. **⚠ Root Cause Analysis: 14% Regression**
- Compare Phase 69 vs Phase 75-4 binary characteristics
@ -176,7 +176,7 @@
7. **Standard vs FAST PGO Convergence**
- Investigate why Standard outperforms FAST PGO by 7-10%
- Consider unified build configuration
- Treat this as a measurement/forensics problem first (PGO profile, flags, link order), not an assumed “PGO must win” rule
- Document PGO ROI vs complexity cost
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