marfrit 7288473d79 Cycle 6 closed (deferred Phase 4): IDCT 4x4 too small for QPU ...

Phase 4 QPU shader DEFERRED (not RED-by-build, but predicted-RED
and not worth building):
- NEON delivers 175 Mblock/s (5.7 ns/block) on a single core
- QPU per-block floor ~250 ns (from cycle 1 scaling) → R6 = 0.022
- Mixed-kernel helper contribution would be ~1-2 Mblock/s — <1%
  of NEON capacity
- 30fps@1080p worst case = 5.85 Mblock/s; NEON delivers 30x that
  on ONE core. No need for QPU help.

Phase 9 lesson: for any cycle with NEON per-block < ~30ns, predict
deep RED and defer Phase 4 unless there's a specific structural
QPU advantage. Shapes future cycle selection: prefer compute-heavy
kernels (cycle 7 H.264 IDCT 8x8 next; cycle 9 luma qpel MC; cycle
10 deblock).

Cycle 6 phase tally: Phase 1 ✓, Phase 2 implicit, Phase 3 ✓
(M1 + M3), Phase 4 DEFERRED, Phase 5-7 N/A, Phase 8 trivial
CPU-only (recipe = stay CPU), Phase 9 ✓.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-18 14:15:25 +00:00

..

issues

Issue 003 closed: mixed-kernel M4 validates V4 deployment shape

2026-05-18 13:44:08 +00:00

dev_process.md

Path B pivot + Phase 0-3 closed with first baseline numbers

2026-05-18 11:30:12 +00:00

k2_deblock_phase1.md

Cycle 2 (deblocking) Phase 1-3: M3'' = 48.285 Medge/s baseline

2026-05-18 12:28:57 +00:00

k2_deblock_phase2.md

Cycle 2 (deblocking) Phase 1-3: M3'' = 48.285 Medge/s baseline

2026-05-18 12:28:57 +00:00

k2_deblock_phase3.md

Cycle 2 (deblocking) Phase 1-3: M3'' = 48.285 Medge/s baseline

2026-05-18 12:28:57 +00:00

k2_deblock_phase4.md

Cycle 2 (LPF) closure: M1''=100%, R''=0.41, M4''=+6.9%, PASS

2026-05-18 12:39:26 +00:00

k2_deblock_phase5.md

Cycle 2 (LPF) closure: M1''=100%, R''=0.41, M4''=+6.9%, PASS

2026-05-18 12:39:26 +00:00

k2_deblock_phase7.md

Cycle 2 (LPF) closure: M1''=100%, R''=0.41, M4''=+6.9%, PASS

2026-05-18 12:39:26 +00:00

k3_mc_phase1.md

Cycle 3 (MC interpolation) closure: M1'''=100%, R'''=0.067 RED, M4=-19.5%

2026-05-18 12:51:43 +00:00

k3_mc_phase2.md

Cycle 3 (MC interpolation) closure: M1'''=100%, R'''=0.067 RED, M4=-19.5%

2026-05-18 12:51:43 +00:00

k3_mc_phase3.md

Cycle 3 (MC interpolation) closure: M1'''=100%, R'''=0.067 RED, M4=-19.5%

2026-05-18 12:51:43 +00:00

k3_mc_phase4.md

Cycle 3 (MC interpolation) closure: M1'''=100%, R'''=0.067 RED, M4=-19.5%

2026-05-18 12:51:43 +00:00

k3_mc_phase5.md

Cycle 3 (MC interpolation) closure: M1'''=100%, R'''=0.067 RED, M4=-19.5%

2026-05-18 12:51:43 +00:00

k3_mc_phase7.md

Issue 003 closed: mixed-kernel M4 validates V4 deployment shape

2026-05-18 13:44:08 +00:00

k4_lpf8_phase1_3.md

Cycle 4 (LPF wd=8) closure: M1=100%, R=0.34, M4=+4.1%, PASS

2026-05-18 12:56:25 +00:00

k4_lpf8_phase4_7.md

Cycle 4 (LPF wd=8) closure: M1=100%, R=0.34, M4=+4.1%, PASS

2026-05-18 12:56:25 +00:00

k5_cdef_phase1_2.md

Cycle 5 setup (Phase 1+2): vendor dav1d 1.4.3 CDEF sources

2026-05-18 13:12:25 +00:00

k5_cdef_phase3_partial.md

Issue 003 closed: mixed-kernel M4 validates V4 deployment shape

2026-05-18 13:44:08 +00:00

k5_cdef_phase3.md

Cycle 5 Phase 3 closed: M1 PASS via bench pointer-convention fix

2026-05-18 13:46:50 +00:00

k5_cdef_phase4.md

Cycle 5 closed: CDEF QPU R5=0.116 ORANGE, opportunistic helper

2026-05-18 13:52:46 +00:00

k5_cdef_phase7.md

Cycle 5 closed: CDEF QPU R5=0.116 ORANGE, opportunistic helper

2026-05-18 13:52:46 +00:00

k6_h264idct4_phase1.md

Cycle 6 (H.264) opened — IDCT 4x4 Phase 1+3, M3 = 175 Mblock/s

2026-05-18 14:14:43 +00:00

k6_h264idct4_phase3.md

Cycle 6 (H.264) opened — IDCT 4x4 Phase 1+3, M3 = 175 Mblock/s

2026-05-18 14:14:43 +00:00

k6_h264idct4_phase4.md

Cycle 6 closed (deferred Phase 4): IDCT 4x4 too small for QPU

2026-05-18 14:15:25 +00:00

phase0.md

Phase 4 plan + Phase 5 second-model review (PASS-WITH-REVISIONS)

2026-05-18 11:47:03 +00:00

phase1.md

Path B pivot + Phase 0-3 closed with first baseline numbers

2026-05-18 11:30:12 +00:00

phase2.md

Phase 4 plan + Phase 5 second-model review (PASS-WITH-REVISIONS)

2026-05-18 11:47:03 +00:00

phase3.md

Path B pivot + Phase 0-3 closed with first baseline numbers

2026-05-18 11:30:12 +00:00

phase4.md

Phase 4 plan + Phase 5 second-model review (PASS-WITH-REVISIONS)

2026-05-18 11:47:03 +00:00

phase5.md

Phase 4 plan + Phase 5 second-model review (PASS-WITH-REVISIONS)

2026-05-18 11:47:03 +00:00

phase7_M4.md

Phase 7 M4: mixed CPU+QPU beats pure 4-core NEON; project continues

2026-05-18 12:18:36 +00:00

phase7.md

Phase 6 (v1+v4 production) + Phase 7 closure: R = 0.92 ± 0.03 on hertz

2026-05-18 12:09:00 +00:00

phase8_scoping.md

Phase 8 skeleton: public C API + first end-to-end smoke test

2026-05-18 13:54:43 +00:00

vulkaninfo_v3d_7_1_7_hertz.txt

Path B pivot + Phase 0-3 closed with first baseline numbers

2026-05-18 11:30:12 +00:00