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fix integer overflow problem #5051

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fix integer overflow problem #5051

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6 changes: 3 additions & 3 deletions .../experimental/gen_ai/src/attention/cuda/cutlass_blackwell_fmha/device/fmha_device_bwd.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -293,7 +293,7 @@ class Sm100FmhaBwd {
ElementAccumulator* scaled_lse = reinterpret_cast<ElementAccumulator*>(workspace_scaled_lse);
ElementAccumulator* dQ_acc = reinterpret_cast<ElementAccumulator*>(workspace_dQ);
params_.dQ_acc = dQ_acc;
params_.dQ_acc_size = B*H*Q*D * sizeof(ElementAccumulator);
params_.dQ_acc_size = static_cast<size_t>(B)*H*Q*D * sizeof(ElementAccumulator);
auto args_sum_OdO = to_sum_OdO_arguments(args, sum_OdO, scaled_lse);
auto args_convert = to_convert_arguments(args, dQ_acc);
params_.op_sum_OdO.initialize(args_sum_OdO, nullptr, stream);
Expand All @@ -320,9 +320,9 @@ class Sm100FmhaBwd {
int Q = cutlass::round_up(static_cast<int>(Q_), 8); // Alignment
char* workspace_chr = reinterpret_cast<char*>(workspace);
ElementAccumulator* sum_OdO = reinterpret_cast<ElementAccumulator*>(workspace_chr);
workspace_chr += B*H*Q * sizeof(ElementAccumulator);
workspace_chr += static_cast<size_t>(B)*H*Q * sizeof(ElementAccumulator);
ElementAccumulator* scaled_lse = reinterpret_cast<ElementAccumulator*>(workspace_chr);
workspace_chr += B*H*Q * sizeof(ElementAccumulator);
workspace_chr += static_cast<size_t>(B)*H*Q * sizeof(ElementAccumulator);
ElementAccumulator* dQ_acc = reinterpret_cast<ElementAccumulator*>(workspace_chr);
return initialize_split(args, dQ_acc, sum_OdO, scaled_lse, stream);
}
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