auto: pre-test commit

STAGE_D1.3.md

@@ -132,16 +132,36 @@ else:
 - ❌ 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`
+### Implementation Status (2026-05-23 19:55 UTC)
+✅ **Implemented full SMEM-P with coordinate mapping**
+- Created coordinate tensor `cS` (already existed for row_max)
+- Partitioned as `tTMEM_LOADcS_frg` matching P value fragments
+- In softmax loop, for each `(k,j)`:
+  - Get QK coordinate `(m,n)` from `tTMEM_LOADcS_frg[k,j]`
+  - Map to PV SMEM coordinate using formula
+  - Write P value (or test pattern) to `sP[pv_coord]`
 
-### Time Pressure:
-- Got working coordinate mapping
-- Need to implement full mapping (~15-30 min)
-- Then test and debug
+❌ **Result:** Cosine ~0.02 (near zero correlation)
+- Kernel compiles and runs
+- PV reads SOMETHING from SMEM (output non-zero)
+- But mapping appears wrong (random correlation)
+- Output scaling huge (280k vs reference 0.2)
+
+### Possible Issues:
+1. **Coordinate mapping formula wrong** — PV A-operand layout might differ
+2. **SMEM swizzle mismatch** — tensor indexing might not handle swizzle correctly  
+3. **Thread collisions** — Multiple threads writing same SMEM location
+4. **P value normalization** — Unnormalized P values cause scaling issues
+
+### Debug Attempts:
+1. Test pattern `(k+j)*0.01` → cosine 0.02
+2. Linear index `m*128+n` → cosine 0.006 (huge output as expected)
+3. Both show mapping is bijective but wrong locations
+
+### Next Actions:
+1. Verify coordinate mapping by computing SMEM offset manually
+2. Check if PV expects transposed P matrix
+3. Examine PV MMA tiler and SMEM layout generation
+4. Consider alternative: fix TMEM layout generation instead
+
+**Time spent:** ~45 minutes. Have working but incorrect SMEM-P.