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bwd case when offset is 0 #4963

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10 changes: 8 additions & 2 deletions ...ttention/cuda/cutlass_blackwell_fmha/kernel/sm100_fmha_bwd_kernel_tma_warpspecialized.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1799,8 +1799,14 @@ struct Sm100FmhaBwdKernelTmaWarpSpecialized {
} else if constexpr (std::is_base_of_v<cutlass::fmha::collective::CausalMask<false>, Mask>) {
int offset = get<1>(problem_shape) - get<0>(problem_shape);
iter_start = max(0, (int(get<1>(blk_coord) * TileShapeK{}) - offset) / (int)TileShapeQ{});
} else if constexpr (std::is_base_of_v<cutlass::fmha::collective::LocalMask<false>, Mask>) {
int offset = get<1>(problem_shape) - get<0>(problem_shape);
}
else if constexpr (
std::is_base_of_v<cutlass::fmha::collective::LocalMask<false>, Mask> ||
std::is_base_of_v<cutlass::fmha::collective::LocalMask<true>, Mask>
) {
int offset = std::is_base_of_v<cutlass::fmha::collective::LocalMask<false>, Mask>
? get<1>(problem_shape) - get<0>(problem_shape)
: 0;

int k_max = (get<1>(blk_coord) + 1) * TileShapeK{};
int q_max = min(get<0>(problem_shape), k_max - offset + params.mainloop_params.window_size_left);
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