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feat: support mxfp4 & mxfp8 entrypoint for blackwell cutedsl dense gemm #2660

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Merged
flashinfer-bot merged 8 commits into from
Mar 6, 2026
Merged

feat: support mxfp4 & mxfp8 entrypoint for blackwell cutedsl dense gemm #2660

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73ab0bc
feat: Add mxfp4 blockscale dense gemm support
b8zhong Feb 28, 2026
c52ce25
fix: adjust alpha calculation for fp4 gemm
b8zhong Feb 28, 2026
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4 changes: 2 additions & 2 deletions benchmarks/routines/flashinfer_benchmark_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -368,8 +368,8 @@ def dtype_str_to_torch_dtype(dtype_str):
"8.6": [],
"8.9": [],
"9.0": [],
"10.0": ["cutlass"],
"10.3": ["cutlass"],
"10.0": ["cutlass", "cute-dsl"],
"10.3": ["cutlass", "cute-dsl"],
"11.0": ["cutlass"],
"12.0": [],
},
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18 changes: 12 additions & 6 deletions benchmarks/routines/gemm.py
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Expand Up @@ -1091,7 +1091,11 @@ def testMmFp4(args):
b=mat2_fp4.T if backend != "trtllm" else mat2_fp4_trtllm.T,
a_descale=input_inv_s,
b_descale=mat2_inv_s.T if backend != "trtllm" else mat2_inv_s_trtllm.T,
alpha=alpha,
alpha=(
torch.tensor([1.0], dtype=torch.float32, device=device)
if (not use_nvfp4 and backend == "cute-dsl")
else alpha
),
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out_dtype=res_dtype,
block_size=16
if use_nvfp4
Expand Down Expand Up @@ -1129,7 +1133,11 @@ def run_backend(
b=mat2_fp4.T if backend != "trtllm" else mat2_fp4_trtllm.T,
a_descale=input_inv_s,
b_descale=mat2_inv_s.T if backend != "trtllm" else mat2_inv_s_trtllm.T,
alpha=alpha,
alpha=(
torch.tensor([1.0], dtype=torch.float32, device=device)
if (not use_nvfp4 and backend == "cute-dsl")
else alpha
),
out_dtype=res_dtype,
block_size=block_size,
use_8x4_sf_layout=not use_128x4_sf_layout,
Expand Down Expand Up @@ -1289,9 +1297,7 @@ def testMmMxfp8(args):
res_dtype = args.out_dtype
is_cuda_graph_compatible = not args.no_cuda_graph
run_refcheck = args.refcheck
autotune_supported_backends = [
"cutlass",
]
autotune_supported_backends = ["cutlass", "cute-dsl"]
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res = []

backends = filter_backends_by_compute_capability(backends, args.routine, device)
Expand Down Expand Up @@ -1344,7 +1350,7 @@ def testMmMxfp8(args):
print(f"[VVERBOSE] {mat2_scale.dtype = }")

def run_backend(backend, input_mxfp8, mat2_mxfp8, input_scale, mat2_scale):
if backend == "cutlass":
if backend in ["cutlass", "cute-dsl", "auto"]:
return flashinfer.gemm.mm_mxfp8(
a=input_mxfp8,
b=mat2_mxfp8.t(), # mm_mxfp8 expects b.t()
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