From e0aa7ccd19348a2d71966f7d6ff5b2d5ac3464f1 Mon Sep 17 00:00:00 2001
From: biondizzle <biondizzle@gmail.com>
Date: Sat, 23 May 2026 19:36:58 +0000
Subject: [PATCH] auto: pre-test commit

---
 STAGE_D1.3.md | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/STAGE_D1.3.md b/STAGE_D1.3.md
index a4c1bad9..c719c5c5 100644
--- a/STAGE_D1.3.md
+++ b/STAGE_D1.3.md
@@ -117,11 +117,31 @@ else:
 - Zeroed sP causes PV MMA to read zeros → garbage output
 - TMEM-P path works for hd=64 but fails for hd>64 due to TMEM layout mismatch
 
-## Blocked Until
-1. Answer from CUTLASS LLM on coordinate mapping
-2. Or alternative approach suggested
+## Progress Update (2026-05-23 19:35 UTC)
+**CUTLASS LLM responded!** Got complete solution:
 
-## Time Pressure
-- Been debugging for ~20 minutes
-- Manual addressing proving much harder than anticipated
-- Without mapping formula, guessing is low-probability
\ No newline at end of file
+### Key Solution:
+1. Use `make_identity_tensor(tStS0.shape)` for coordinate tensor
+2. Partition coordinate tensor same way as data tensor
+3. Mapping formula: QK `((m, n), 0, 0)` → PV `((m, n % 16), 0, ((n // 16) % 4, n // 64), 0)`
+4. Use tensor indexing `sP[dst_coord] = value`, not manual offsets
+
+### Implementation Progress:
+- ✅ Coordinate mapping function implemented and works (`qk_to_pv_coord`)
+- ✅ Tensor indexing with coordinate works (`sP[test_coord] = value`)
+- ❌ Need to implement full 128-value mapping per thread
+- ❌ Need to get QK coordinates for each of thread's 128 P values
+
+### Next Steps:
+1. Create coordinate tensor `cP_qk = cute.make_identity_tensor(tStS0.shape)`
+2. Partition it same way as `rP_bf16` (through `tTMEM_LOADcP`)
+3. In softmax loop, for each fragment j and element k:
+   - Get P value from `rP_bf16_frg` or directly from `tTMEM_LOADrS_frg`
+   - Get coordinate from partitioned coordinate tensor
+   - Map to PV coordinate using `qk_to_pv_coord`
+   - Write to SMEM: `sP[dst_coord] = value`
+
+### Time Pressure:
+- Got working coordinate mapping
+- Need to implement full mapping (~15-30 min)
+- Then test and debug
\ No newline at end of file