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[CI/Build] Conditionally register cutlass_fp4_group_mm to fix building on Hopper #26138

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Merged
vllm-bot merged 1 commit into from
Oct 3, 2025
Merged

[CI/Build] Conditionally register cutlass_fp4_group_mm to fix building on Hopper #26138

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6 changes: 6 additions & 0 deletions csrc/quantization/fp4/nvfp4_blockwise_moe_kernel.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@
* limitations under the License.
*/

#include "core/registration.h"

#include <torch/all.h>
#include <cutlass/arch/arch.h>

Expand Down Expand Up @@ -418,3 +420,7 @@ void cutlass_fp4_group_mm(
"12.8 or above.");
#endif
}

TORCH_LIBRARY_IMPL_EXPAND(TORCH_EXTENSION_NAME, CUDA, m) {
m.impl("cutlass_fp4_group_mm", &cutlass_fp4_group_mm);
}
2 changes: 1 addition & 1 deletion csrc/torch_bindings.cpp
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Expand Up @@ -397,7 +397,7 @@ TORCH_LIBRARY_EXPAND(TORCH_EXTENSION_NAME, ops) {
" Tensor a_blockscale, Tensor b_blockscales, Tensor alphas,"
" Tensor problem_sizes, Tensor expert_offsets, Tensor sf_offsets) -> ()",
{stride_tag});
ops.impl("cutlass_fp4_group_mm", torch::kCUDA, &cutlass_fp4_group_mm);
// conditionally compiled so impl registration is in source file

// CUTLASS w8a8 GEMM, supporting symmetric per-tensor or per-row/column
// quantization, as well as bias
Expand Down