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Support different dtype for LinearCombination #556

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ef94850
Support different dtype for LinearCombination
joyalbin Oct 13, 2025
64e777a
Correct usage of LinearCombination with proper inputs.
joyalbin Oct 17, 2025
528c1c5
Fix merge conflict
joyalbin Oct 17, 2025
cfac845
Fix benchmarks MixedPrecision testcases
joyalbin Oct 22, 2025
66322cc
Fix merge conflicts
joyalbin Oct 22, 2025
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25 changes: 16 additions & 9 deletions benchmarks/gemm/benchmarks_sycl.hpp
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Expand Up @@ -319,12 +319,13 @@ using PvcMixedPrecisionGemmFP16U4FP16F16FP16S4_RCR_1 = cutlass::gemm::device::Mi
cutlass::half_t, cutlass::layout::RowMajor,
cutlass::uint4_t, cutlass::layout::ColumnMajor,
cutlass::half_t, cutlass::layout::RowMajor,
float, cutlass::layout::RowMajor,
cutlass::half_t, cute::Stride<_1, int64_t, int64_t>,
cutlass::int4_t, cute::Stride<_8, cute::Stride<_1, int64_t>, int64_t>,
Shape<_32, _128, _32>, Scheduler::Gemm,
typename TiledMMAHelper<MMA_Atom<XE_8x16x16_F32F16F16F32_TT>, Layout<Shape<_32, _128, _32>>,
Layout<Shape<_1, _4, _1>, Stride<_4, _1, _0>>>::TiledMMA,
XE_2D_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U16x8x16_ST_N,
XE_2D_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U32x8x16_ST_N,
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  1. I think it's better to add copy_traits for both C and D for different data type. XE_2D_U16x8x16_ST_N here
    means storing to D as F16, you shouldn't change it. If you want to store D as F32, you should add a new
    GemmConfiguration for it.
  2. can you refine the data type name in "FP16U4FP16F16FP16S4" according to your changes.
    The data type " FP16U4FP16F16FP16S4 " in the name are: A, B, C, Mma, Scale, Zero

cutlass::epilogue::fusion::LinearCombination<float, float,
float, float, cutlass::FloatRoundStyle::round_to_nearest>,
2
Expand All @@ -335,12 +336,13 @@ using PvcMixedPrecisionGemmBF16U4BF16BF16BF16S4_RCR_1 = cutlass::gemm::device::M
cutlass::bfloat16_t, cutlass::layout::RowMajor,
cutlass::uint4_t, cutlass::layout::ColumnMajor,
cutlass::bfloat16_t, cutlass::layout::RowMajor,
float, cutlass::layout::RowMajor,
cutlass::bfloat16_t, cute::Stride<_1, int64_t, int64_t>,
cutlass::int4_t, cute::Stride<_8, cute::Stride<_1, int64_t>, int64_t>,
Shape<_32, _128, _32>, Scheduler::Gemm,
typename TiledMMAHelper<MMA_Atom<XE_8x16x16_F32BF16BF16F32_TT>, Layout<Shape<_32, _128, _32>>,
Layout<Shape<_1, _4, _1>, Stride<_4, _1, _0>>>::TiledMMA,
XE_2D_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U16x8x16_ST_N,
XE_2D_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U32x8x16_ST_N,
cutlass::epilogue::fusion::LinearCombination<float, float,
float, float, cutlass::FloatRoundStyle::round_to_nearest>,
2
Expand All @@ -351,28 +353,29 @@ using PvcMixedPrecisionGemmFP16U4FP16S8FP16S4_RCR_1 = cutlass::gemm::device::Mix
cutlass::half_t, cutlass::layout::RowMajor,
cutlass::uint4_t, cutlass::layout::ColumnMajor,
cutlass::half_t, cutlass::layout::RowMajor,
int, cutlass::layout::RowMajor,
cutlass::half_t, cute::Stride<_1, int64_t, int64_t>,
cutlass::int4_t, cute::Stride<_8, cute::Stride<_1, int64_t>, int64_t>,
Shape<_32, _128, _32>, Scheduler::Gemm,
typename TiledMMAHelper<MMA_Atom<XE_8x16x32_S32S8S8S32_TT>, Layout<Shape<_32, _128, _32>>,
Layout<Shape<_1, _4, _1>, Stride<_4, _1, _0>>>::TiledMMA,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U16x8x16_ST_N,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U32x8x16_ST_N,
cutlass::epilogue::fusion::LinearCombination<int, int,
int, int, cutlass::FloatRoundStyle::round_to_nearest>,
2
>;

using PvcMixedPrecisionGemmFP16U4S8S8FP16S4_RCR_1 = cutlass::gemm::device::MixedPrecisionGemmConfiguration<
cutlass::arch::IntelXe,
cutlass::half_t, cutlass::layout::RowMajor,
cutlass::uint4_t, cutlass::layout::ColumnMajor,
cutlass::int8_t, cutlass::layout::RowMajor,
int, cutlass::layout::RowMajor,
cutlass::half_t, cute::Stride<_1, int64_t, int64_t>,
cutlass::int4_t, cute::Stride<_8, cute::Stride<_1, int64_t>, int64_t>,
Shape<_32, _128, _32>, Scheduler::Gemm,
typename TiledMMAHelper<MMA_Atom<XE_8x16x32_S32S8S8S32_TT>, Layout<Shape<_32, _128, _32>>,
Layout<Shape<_1, _4, _1>, Stride<_4, _1, _0>>>::TiledMMA,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U8x8x16_ST_N,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U32x8x16_ST_N,
cutlass::epilogue::fusion::LinearCombination<int, int,
int, int, cutlass::FloatRoundStyle::round_to_nearest>,
2
Expand All @@ -383,12 +386,13 @@ using PvcMixedPrecisionGemmBF16U4BF16S8BF16S4_RCR_1 = cutlass::gemm::device::Mix
cutlass::bfloat16_t, cutlass::layout::RowMajor,
cutlass::uint4_t, cutlass::layout::ColumnMajor,
cutlass::bfloat16_t, cutlass::layout::RowMajor,
int, cutlass::layout::RowMajor,
cutlass::bfloat16_t, cute::Stride<_1, int64_t, int64_t>,
cutlass::int4_t, cute::Stride<_8, cute::Stride<_1, int64_t>, int64_t>,
Shape<_32, _128, _32>, Scheduler::Gemm,
typename TiledMMAHelper<MMA_Atom<XE_8x16x32_S32S8S8S32_TT>, Layout<Shape<_32, _128, _32>>,
Layout<Shape<_1, _4, _1>, Stride<_4, _1, _0>>>::TiledMMA,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U16x8x16_ST_N,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U32x8x16_ST_N,
cutlass::epilogue::fusion::LinearCombination<int, int,
int, int, cutlass::FloatRoundStyle::round_to_nearest>,
2
Expand All @@ -399,12 +403,13 @@ using PvcMixedPrecisionGemmBF16U4S8S8BF16S4_RCR_1 = cutlass::gemm::device::Mixed
cutlass::bfloat16_t, cutlass::layout::RowMajor,
cutlass::uint4_t, cutlass::layout::ColumnMajor,
cutlass::int8_t, cutlass::layout::RowMajor,
int, cutlass::layout::RowMajor,
cutlass::bfloat16_t, cute::Stride<_1, int64_t, int64_t>,
cutlass::int4_t, cute::Stride<_8, cute::Stride<_1, int64_t>, int64_t>,
Shape<_32, _128, _32>, Scheduler::Gemm,
typename TiledMMAHelper<MMA_Atom<XE_8x16x32_S32S8S8S32_TT>, Layout<Shape<_32, _128, _32>>,
Layout<Shape<_1, _4, _1>, Stride<_4, _1, _0>>>::TiledMMA,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U8x8x16_ST_N,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U4x32x16_LD_T, XE_2D_U32x8x16_ST_N,
cutlass::epilogue::fusion::LinearCombination<int, int,
int, int, cutlass::FloatRoundStyle::round_to_nearest>,
2
Expand All @@ -415,12 +420,13 @@ using PvcMixedPrecisionGemmBF16S8BF16S8BF16S8_RCR_1 = cutlass::gemm::device::Mix
cutlass::bfloat16_t, cutlass::layout::RowMajor,
cutlass::int8_t, cutlass::layout::ColumnMajor,
cutlass::bfloat16_t, cutlass::layout::RowMajor,
int, cutlass::layout::RowMajor,
cutlass::bfloat16_t, cute::Stride<_1, int64_t, int64_t>,
cutlass::int8_t, cute::Stride<_1, int64_t, int64_t>,
Shape<_32, _128, _32>, Scheduler::Gemm,
typename TiledMMAHelper<MMA_Atom<XE_8x16x32_S32S8S8S32_TT>, Layout<Shape<_32, _128, _32>>,
Layout<Shape<_1, _4, _1>, Stride<_4, _1, _0>>>::TiledMMA,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U8x16x32_LD_T, XE_2D_U16x8x16_ST_N,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U8x16x32_LD_T, XE_2D_U32x8x16_ST_N,
cutlass::epilogue::fusion::LinearCombination<int, int,
int, int, cutlass::FloatRoundStyle::round_to_nearest>,
2
Expand All @@ -431,12 +437,13 @@ using PvcMixedPrecisionGemmFP16S8FP16S8FP16S8_RCR_1 = cutlass::gemm::device::Mix
cutlass::half_t, cutlass::layout::RowMajor,
cutlass::int8_t, cutlass::layout::ColumnMajor,
cutlass::half_t, cutlass::layout::RowMajor,
int, cutlass::layout::RowMajor,
cutlass::half_t, cute::Stride<_1, int64_t, int64_t>,
cutlass::int8_t, cute::Stride<_1, int64_t, int64_t>,
Shape<_32, _128, _32>, Scheduler::Gemm,
typename TiledMMAHelper<MMA_Atom<XE_8x16x32_S32S8S8S32_TT>, Layout<Shape<_32, _128, _32>>,
Layout<Shape<_1, _4, _1>, Stride<_4, _1, _0>>>::TiledMMA,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U8x16x32_LD_T, XE_2D_U16x8x16_ST_N,
XE_2D_Packed_U16x32x32_LD_N, XE_2D_U8x16x32_LD_T, XE_2D_U32x8x16_ST_N,
cutlass::epilogue::fusion::LinearCombination<int, int,
int, int, cutlass::FloatRoundStyle::round_to_nearest>,
2
Expand Down
6 changes: 4 additions & 2 deletions benchmarks/gemm/gemm_configuration_sycl.hpp
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Expand Up @@ -70,6 +70,7 @@ template<
class ArchTag,
class ElementA, class LayoutA,
class ElementB, class LayoutB, class ElementC, typename LayoutC,
class ElementD, typename LayoutD,
class ElementScale, typename StrideS,
class ElementZero, typename StrideZ,
class TileShape, Scheduler TileScheduler,
Expand Down Expand Up @@ -175,6 +176,7 @@ struct GemmConfiguration<
template<class ElementA, class LayoutA,
class ElementB, class LayoutB,
class ElementC, typename LayoutC,
class ElementD, typename LayoutD,
class ElementScale, typename StrideS,
class ElementZero, typename StrideZ,
class TileShape, Scheduler TileScheduler,
Expand All @@ -185,13 +187,13 @@ struct MixedPrecisionGemmConfiguration<
ElementA, LayoutA,
ElementB, LayoutB,
ElementC, LayoutC,
ElementD, LayoutD,
ElementScale, StrideS,
ElementZero, StrideZ,
TileShape, TileScheduler, TiledMma,
GmemTiledCopyA, GmemTiledCopyB,
GmemTiledCopyC, EpilogueOp, Stages>
{
using LayoutD = LayoutC;

using GEMMDispatchPolicy = cutlass::gemm::MainloopIntelXeXMX16MixedPrecision<Stages>;
using EpilogueDispatchPolicy = cutlass::epilogue::IntelXeXMX16;
Expand All @@ -205,7 +207,7 @@ struct MixedPrecisionGemmConfiguration<
TileShape,
ElementAccumulator,
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This should be ElementC, right?

cutlass::gemm::TagToStrideC_t<LayoutC>,
ElementC,
ElementD,
cutlass::gemm::TagToStrideC_t<LayoutD>,
FusionCallBacks,
XE_2D_U32x8x16_LD_N,
Expand Down
4 changes: 2 additions & 2 deletions examples/02_bmg_gemm_mixed_dtype/02_bmg_gemm_f16_u4_f16.cpp
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Expand Up @@ -263,7 +263,7 @@ struct ExampleRunner {
using GEMMDispatchPolicy = cutlass::gemm::MainloopIntelXeXMX16<PipelineStages>;
using EpilogueDispatchPolicy = cutlass::epilogue::IntelXeXMX16;

using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementAccumulator, ElementCompute,
using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementOutput, ElementCompute,
ElementAccumulator, ElementAccumulator, cutlass::FloatRoundStyle::round_to_nearest>;

using FusionCallBacks = cutlass::epilogue::fusion::FusionCallbacks<EpilogueDispatchPolicy, EpilogueOp, TileShape,
Expand Down Expand Up @@ -648,7 +648,7 @@ int main(int argc, const char** argv) {
using GEMMDispatchPolicy = cutlass::gemm::MainloopIntelXeXMX16MixedPrecision<PipelineStages>;
using EpilogueDispatchPolicy = cutlass::epilogue::IntelXeXMX16;

using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementAccumulator, ElementComputeEpilogue,
using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementOutput, ElementComputeEpilogue,
ElementAccumulator, ElementAccumulator, cutlass::FloatRoundStyle::round_to_nearest>;

using FusionCallBacks = cutlass::epilogue::fusion::FusionCallbacks<EpilogueDispatchPolicy, EpilogueOp, TileShape,
Expand Down
4 changes: 2 additions & 2 deletions examples/02_bmg_gemm_mixed_dtype/02_bmg_gemm_f16_u4_s8.cpp
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Expand Up @@ -258,7 +258,7 @@ struct ExampleRunner {
using GEMMDispatchPolicy = cutlass::gemm::MainloopIntelXeXMX16<PipelineStages>;
using EpilogueDispatchPolicy = cutlass::epilogue::IntelXeXMX16;

using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementAccumulator, ElementCompute,
using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementOutput, ElementCompute,
ElementAccumulator, ElementAccumulator, cutlass::FloatRoundStyle::round_to_nearest>;

using FusionCallBacks = cutlass::epilogue::fusion::FusionCallbacks<EpilogueDispatchPolicy, EpilogueOp, TileShape,
Expand Down Expand Up @@ -735,7 +735,7 @@ int main(int argc, const char** argv) {
using GEMMDispatchPolicy = cutlass::gemm::MainloopIntelXeXMX16MixedPrecision<PipelineStages>;
using EpilogueDispatchPolicy = cutlass::epilogue::IntelXeXMX16;

using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementAccumulator, ElementComputeEpilogue,
using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementOutput, ElementComputeEpilogue,
ElementAccumulator, ElementAccumulator, cutlass::FloatRoundStyle::round_to_nearest>;

using FusionCallBacks = cutlass::epilogue::fusion::FusionCallbacks<EpilogueDispatchPolicy, EpilogueOp, TileShape,
Expand Down
2 changes: 1 addition & 1 deletion examples/10_bmg_grouped_gemm_mixed_dtype/10_bmg_grouped_gemm_f16_u4.cpp
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Expand Up @@ -115,7 +115,7 @@ int main(int argc, const char** argv) {
using GEMMDispatchPolicy = cutlass::gemm::MainloopIntelXeXMX16GroupMixedPrecision<PipelineStages>;
using EpilogueDispatchPolicy = cutlass::epilogue::IntelXeXMX16Group;

using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementAccumulator, ElementComputeEpilogue,
using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementOutput, ElementComputeEpilogue,
ElementAccumulator, ElementAccumulator, cutlass::FloatRoundStyle::round_to_nearest>;

using FusionCallBacks = cutlass::epilogue::fusion::FusionCallbacks<EpilogueDispatchPolicy, EpilogueOp, TileShape,
Expand Down
2 changes: 1 addition & 1 deletion examples/10_bmg_grouped_gemm_mixed_dtype/bmg_grouped_gemm_mixed_dtype_runner.hpp
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Expand Up @@ -389,7 +389,7 @@ struct ExampleRunner {
using GEMMDispatchPolicy = cutlass::gemm::MainloopIntelXeXMX16<PipelineStages>;
using EpilogueDispatchPolicy = cutlass::epilogue::IntelXeXMX16;

using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementAccumulator, ElementCompute,
using EpilogueOp = cutlass::epilogue::fusion::LinearCombination<ElementOutput, ElementCompute,
ElementAccumulator, ElementAccumulator, cutlass::FloatRoundStyle::round_to_nearest>;

using FusionCallBacks = cutlass::epilogue::fusion::FusionCallbacks<EpilogueDispatchPolicy, EpilogueOp, TileShape,
Expand Down
6 changes: 3 additions & 3 deletions include/cutlass/epilogue/collective/xe_array_epilogue.hpp
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Expand Up @@ -115,7 +115,7 @@ class CollectiveEpilogue<
static constexpr FloatRoundStyle RoundStyle = FloatRoundStyle::round_to_nearest;

static_assert(cute::is_same_v<typename FusionCallbacks::Operation,
fusion::LinearCombination<ElementAccumulator, ElementCompute, ElementSource, ElementScalar, RoundStyle>>,
fusion::LinearCombination<ElementOutput, ElementCompute, ElementSource, ElementScalar, RoundStyle>>,
"Only Linear Combination Epilogue is supported for Grouped GEMM at the moment.");

static constexpr int SubgroupSize = DispatchPolicy::SubgroupSize;
Expand Down Expand Up @@ -411,7 +411,7 @@ class CollectiveEpilogue<
cst_callbacks.begin();

auto acc_frag = recast<Array<ElementCompute, FragmentSize>>(accumulators);
auto trD_compute_frag = recast<Array<ElementCompute, FragmentSize>>(trD_compute);
auto trD_compute_frag = recast<Array<ElementOutput, FragmentSize>>(trD_compute);

Tensor trD = make_tensor<ElementOutput>(Shape<Int<FragmentSize>>{});
auto trD_frag = recast<Array<ElementOutput, FragmentSize>>(trD);
Expand Down Expand Up @@ -445,7 +445,7 @@ class CollectiveEpilogue<
if constexpr (is_destination_supported) {
CUTLASS_PRAGMA_UNROLL
for (int i = 0; i < size(trD_compute_frag); ++i) {
trD_frag(i) = cutlass::NumericArrayConverter<ElementOutput, ElementCompute, FragmentSize>{}(trD_compute_frag(i));
trD_frag(i) = cutlass::NumericArrayConverter<ElementOutput, ElementOutput, FragmentSize>{}(trD_compute_frag(i));
}
copy(params.xe_store_d.with(get<1>(load_store_tensors)), trD, tCgD(_, epi_m, epi_n));
}
Expand Down
4 changes: 2 additions & 2 deletions include/cutlass/epilogue/collective/xe_epilogue.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -389,7 +389,7 @@ class CollectiveEpilogue<
cst_callbacks.begin();

auto acc_frag = recast<Array<ElementCompute, FragmentSize>>(accumulators);
auto trD_compute_frag = recast<Array<ElementCompute, FragmentSize>>(trD_compute);
auto trD_compute_frag = recast<Array<ElementOutput, FragmentSize>>(trD_compute);

Tensor trD = make_tensor<ElementOutput>(Shape<Int<FragmentSize>>{});
auto trD_frag = recast<Array<ElementOutput, FragmentSize>>(trD);
Expand Down Expand Up @@ -423,7 +423,7 @@ class CollectiveEpilogue<
if constexpr (is_destination_supported) {
CUTLASS_PRAGMA_UNROLL
for (int i = 0; i < size(trD_compute_frag); ++i) {
trD_frag(i) = cutlass::NumericArrayConverter<ElementOutput, ElementCompute, FragmentSize>{}(trD_compute_frag(i));
trD_frag(i) = cutlass::NumericArrayConverter<ElementOutput, ElementOutput, FragmentSize>{}(trD_compute_frag(i));
}
copy(params.xe_store_d, trD, tCgD(_, epi_m, epi_n));
}
Expand Down
4 changes: 2 additions & 2 deletions test/unit/gemm/device/default_gemm_configuration.hpp
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Expand Up @@ -1465,7 +1465,7 @@ struct DefaultGemmConfigurationToCutlass3Types<
cutlass::gemm::collective::KernelScheduleAuto
>::CollectiveOp;

using EpilogueOp = epilogue::fusion::LinearCombination<float, float>;
using EpilogueOp = epilogue::fusion::LinearCombination<ElementOutput, float>;

using FusionCallBacks = cutlass::epilogue::fusion::FusionCallbacks<
epilogue::IntelXeXMX16,
Expand Down Expand Up @@ -1567,7 +1567,7 @@ struct DefaultGemmConfigurationToCutlass3Types<
cutlass::gemm::collective::KernelScheduleAuto
>::CollectiveOp;

using EpilogueOp = epilogue::fusion::LinearCombination<float, float>;
using EpilogueOp = epilogue::fusion::LinearCombination<ElementOutput, float>;

using FusionCallBacks = cutlass::epilogue::fusion::FusionCallbacks<
epilogue::IntelXeXMX16,
Expand Down
2 changes: 1 addition & 1 deletion test/unit/gemm/device/default_gemm_group_configuration.hpp
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Expand Up @@ -87,7 +87,7 @@ struct DefaultGemmGroupConfiguration<

using TiledMma = typename CollectiveMainloop::TiledMma;

using EpilogueOp = epilogue::fusion::LinearCombination<float, float>;
using EpilogueOp = epilogue::fusion::LinearCombination<ElementOutput, float>;

using FusionCallBacks = epilogue::fusion::FusionCallbacks<
epilogue::IntelXeXMX16Group,
Expand Down
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