biondizzle/nvfp4-megamoe-kernel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

D1.1: Fix PV A-operand construction — compile-time branch for TMEM vs SMEM

Browse Source
This commit is contained in:
biondizzle
2026-05-23 06:03:27 +00:00
parent d36b727898
commit 80434d0284
1 changed files with 14 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
dsv4/kernels/attention/fmha.py
View File

@@ -166,14 +166,20 @@ class FmhaKernel:
tOtO = pv_thr.make_fragment_C(pv_as)
tOtO0 = cute.make_tensor(tOtO.iterator + self.tmem_o0_offset, tOtO.layout)
# PV A-operand: always define both TMEM and SMEM paths (CuTeDSL scoping)
tP = cute.make_tensor(tStS.iterator, p_tmem_s.outer)
tOrP_base = pv_thr.make_fragment_A(tP)
tOrP = tOrP_base[(None,None,None,0)]
tOrP0 = cute.make_tensor(
tOrP.iterator + self.qk_acc_dtype.width // self.q_dtype.width * max(self.tmem_p0_offset, 0),
tOrP.layout)
tCrP = pv_mma.make_fragment_A(sP)
# PV A-operand: constructed based on use_smem_p (compile-time branch)
if not self.use_smem_p:
# TMEM-P: PV reads P from TMEM alias of QK C-fragment
tP = cute.make_tensor(tStS.iterator, p_tmem_s.outer)
tOrP_base = pv_thr.make_fragment_A(tP)
tOrP = tOrP_base[(None,None,None,0)]
tOrP0 = cute.make_tensor(
tOrP.iterator + self.qk_acc_dtype.width // self.q_dtype.width * self.tmem_p0_offset,
tOrP.layout)
tCrP = pv_mma.make_fragment_A(sP) # dummy, never used
else:
# SMEM-P: PV reads P from SMEM
tOrP0 = cute.make_tensor(tStS.iterator, tStS.layout) # dummy, never used
tCrP = pv_mma.make_fragment_A(sP)
tCtO_fake = pv_mma.make_fragment_C(cute.append(pv_as, self.num_acc_stage))
pipeline.pipeline_init_wait(cluster_shape_mn=cl_vmnk)