Support b_scale: (#2350)

- extend pipeline v1 and v3
 - add instances
 - add tests
 - add example

Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com>
This commit is contained in:
Enrico Degregori
2025-07-25 03:49:58 +02:00
committed by GitHub
parent 2addf05b91
commit b01a27ff22
24 changed files with 3744 additions and 1660 deletions

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@@ -1,5 +1,5 @@
// SPDX-License-Identifier: MIT
// Copyright (c) 2024, Advanced Micro Devices, Inc. All rights reserved.
// Copyright (c) 2024-2025, Advanced Micro Devices, Inc. All rights reserved.
#pragma once
@@ -17,6 +17,22 @@ namespace tensor_operation {
namespace device {
namespace instance {
#if(defined(CK_ENABLE_FP16) || defined(CK_ENABLE_FP8))
#ifdef CK_USE_WMMA
void add_device_gemm_b_scale_wmma_f16_i4_f16_mk_nk_mn_mem_v2_default_instances(
std::vector<std::unique_ptr<DeviceGemmV2BScale<Row,
Col,
Row,
F16,
I4,
F16,
F16,
1,
128,
PassThrough,
PassThrough,
PassThrough>>>& instances);
#endif
#ifdef CK_USE_XDL
void add_device_gemm_b_scale_xdl_f16_i4_f16_mk_nk_mn_mem_v2_default_instances(
std::vector<std::unique_ptr<DeviceGemmV2BScale<Row,
Col,
@@ -31,6 +47,7 @@ void add_device_gemm_b_scale_xdl_f16_i4_f16_mk_nk_mn_mem_v2_default_instances(
PassThrough,
PassThrough>>>& instances);
#endif
#endif
template <typename ADataType,
typename BDataType,
@@ -77,7 +94,12 @@ struct DeviceOperationInstanceFactory<ck::tensor_operation::device::DeviceGemmV2
if constexpr(is_same_v<ALayout, Row> && is_same_v<BLayout, Col> &&
is_same_v<CLayout, Row>)
{
#ifdef CK_USE_WMMA
add_device_gemm_b_scale_wmma_f16_i4_f16_mk_nk_mn_mem_v2_default_instances(op_ptrs);
#endif
#ifdef CK_USE_XDL
add_device_gemm_b_scale_xdl_f16_i4_f16_mk_nk_mn_mem_v2_default_instances(op_ptrs);
#endif
}
}

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@@ -1,10 +1,12 @@
# ONLY XDL_KERNELS
# ONLY XDL_AND_WMMA_KERNELS
set(GEMM_B_SCALE_INSTANCES)
list(APPEND GEMM_B_SCALE_INSTANCES
device_gemm_b_scale_xdl_f16_i4_f16/device_gemm_b_scale_xdl_f16_i4_f16_mk_nk_mn_mem_v2_default_instance.cpp
device_gemm_b_scale_wmma_f16_i4_f16/device_gemm_b_scale_wmma_f16_i4_f16_mk_nk_mn_mem_v2_default_instance.cpp
)
set_source_files_properties(device_gemm_b_scale_xdl_f16_i4_f16/device_gemm_b_scale_xdl_f16_i4_f16_mk_nk_mn_mem_v2_default_instance.cpp PROPERTIES COMPILE_OPTIONS ";-mllvm;-greedy-reverse-local-assignment=1")
set_source_files_properties(device_gemm_b_scale_wmma_f16_i4_f16/device_gemm_b_scale_wmma_f16_i4_f16_mk_nk_mn_mem_v2_default_instance.cpp PROPERTIES COMPILE_OPTIONS ";-mllvm;-greedy-reverse-local-assignment=1")
add_instance_library(device_gemm_b_scale_instance ${GEMM_B_SCALE_INSTANCES})
add_instance_library(device_gemm_b_scale_instance ${GEMM_B_SCALE_INSTANCES})

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@@ -0,0 +1,72 @@
// SPDX-License-Identifier: MIT
// Copyright (c) 2025, Advanced Micro Devices, Inc. All rights reserved.
#include "ck/ck.hpp"
#include "ck/tensor_operation/gpu/device/gemm_specialization.hpp"
#include "ck/tensor_operation/gpu/device/impl/device_gemm_wmma_cshuffle_v3_b_scale.hpp"
#include "ck/tensor_operation/gpu/device/tensor_layout.hpp"
#include "ck/library/tensor_operation_instance/add_device_operation_instance.hpp"
namespace ck {
namespace tensor_operation {
namespace device {
namespace instance {
using I4 = pk_i4_t;
using F16 = half_t;
using F32 = float;
using Row = tensor_layout::gemm::RowMajor;
using Col = tensor_layout::gemm::ColumnMajor;
template <index_t... Is>
using S = Sequence<Is...>;
using PassThrough = element_wise::PassThrough;
static constexpr auto GemmDefault = GemmSpecialization::Default;
static constexpr auto GemmKPadding = GemmSpecialization::KPadding;
static constexpr auto GemmMNPadding = GemmSpecialization::MNPadding;
static constexpr auto GemmMNKPadding = GemmSpecialization::MNKPadding;
static constexpr auto Intrawave = BlockGemmPipelineScheduler::Intrawave;
static constexpr auto Interwave = BlockGemmPipelineScheduler::Interwave;
template <GemmSpecialization GemmSpec>
using device_gemm_b_scale_wmma_f16_i4_f16_mk_nk_mn_mem_instances = std::tuple<
// clang-format off
//################################| ALayout| BLayout| CLayout|AData| BData| BScale| CData| AccData| Cshuffle| A| B| C| GEMM| Block| Scale| Scale| MPer| NPer| KPer| AK1| BK1|MPer| NPer| MRepeat| NRepeat| ABlockTransfer| ABlockTransfer| ABlockTransfer| ABlockTransfer| ABlockTransfer| ABlockTransfer| ABlockLds| BBlockTransfer| BBlockTransfer| BBlockTransfer| BlockTransfer| BBlockTransfer| BBlockTransfer| BBlockLds| CShuffle| CShuffle| CBlockTransferClusterLengths| CBlockTransfer| Block-wiseGemm| Block-wiseGemm| Compute| Compute| PermuteA| PermuteB|
//################################| | | | Type| Type| Data| Type| Type| Type| Elementwise| Elementwise| Elementwise|Specialization| Size| Block| Block| Block| Block| Block| | |Wmma| Wmma| | | ThreadCluster| ThreadCluster| SrcAccessOrder| SrcVectorDim| SrcScalar| DstScalar| AddExtraM| ThreadCluster| ThreadCluster| SrcAccessOrder| SrcVectorDim| SrcScalar| DstScalar| AddExtraN| MRepeat| NRepeat| _MBlock_MPerBlock| ScalarPerVector| Pipeline| Pipeline| TypeA| TypeB| | |
//################################| | | | | | Type| | | | Operation| Operation| Operation| | | N| K| | | | | | | | | | Lengths_K0_M_K1| ArrangeOrder| | | PerVector| PerVector_K1| | Lengths_K0_N_K1| ArrangeOrder| | | PerVector| PerVector_K1| | PerShuffle| PerShuffle| _NBlock_NPerBlock| _NPerBlock| Scheduler| Verision| | | | |
//################################| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 256, 1, 128, 128, 128, 64, 8, 8, 16, 16, 4, 2, S< 8, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 8>, 8, Intrawave, BlockGemmPipelineVersion::v3, half_t, half_t, false, false>, //0
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 256, 1, 128, 128, 128, 64, 8, 8, 16, 16, 4, 2, S< 8, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 8>, 8, Intrawave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //1
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 256, 1, 128, 128, 128, 64, 8, 8, 16, 16, 4, 2, S< 8, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 8>, 8, Interwave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //2
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 128, 1, 128, 64, 64, 64, 8, 8, 16, 16, 2, 2, S< 4, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 4, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 4>, 8, Intrawave, BlockGemmPipelineVersion::v3, half_t, half_t, false, false>, //3
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 128, 1, 128, 64, 64, 64, 8, 8, 16, 16, 2, 2, S< 4, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 4, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 4>, 8, Intrawave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //4
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 128, 1, 128, 64, 64, 64, 8, 8, 16, 16, 2, 2, S< 4, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 4, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 4>, 8, Interwave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //5
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 32, 32, 64, 8, 8, 16, 16, 2, 2, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 8, Intrawave, BlockGemmPipelineVersion::v3, half_t, half_t, false, false>, //6
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 32, 32, 64, 8, 8, 16, 16, 2, 2, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 8, Intrawave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //7
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 32, 32, 64, 8, 8, 16, 16, 2, 2, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 8, Interwave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //8
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 256, 1, 128, 128, 128, 128, 8, 8, 16, 16, 4, 2, S<16, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S<16, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 8>, 8, Intrawave, BlockGemmPipelineVersion::v3, half_t, half_t, false, false>, //9
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 256, 1, 128, 128, 128, 128, 8, 8, 16, 16, 4, 2, S<16, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S<16, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 8>, 8, Intrawave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //10
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 256, 1, 128, 128, 128, 128, 8, 8, 16, 16, 4, 2, S<16, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S<16, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 32, 1, 8>, 8, Interwave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //11
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 128, 1, 128, 32, 32, 128, 8, 8, 16, 16, 1, 1, S< 8, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 8, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 8>, 2, Intrawave, BlockGemmPipelineVersion::v3, half_t, half_t, false, false>, //12
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 128, 1, 128, 32, 32, 128, 8, 8, 16, 16, 1, 1, S< 8, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 8, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 8>, 2, Intrawave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //13
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 128, 1, 128, 32, 32, 128, 8, 8, 16, 16, 1, 1, S< 8, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 8, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 8>, 2, Interwave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //14
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 16, 16, 128, 8, 8, 16, 16, 1, 1, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 8, Intrawave, BlockGemmPipelineVersion::v3, half_t, half_t, false, false>, //15
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 16, 16, 128, 8, 8, 16, 16, 1, 1, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 8, Intrawave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //16
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 16, 16, 128, 8, 8, 16, 16, 1, 1, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 2, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 8, Interwave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //17
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 16, 16, 128, 8, 8, 16, 16, 1, 1, S< 4, 8, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 4, 8, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 4, Intrawave, BlockGemmPipelineVersion::v3, half_t, half_t, false, false>, //18
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 16, 16, 128, 8, 8, 16, 16, 1, 1, S< 4, 8, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 4, 8, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 4, Intrawave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false>, //19
DeviceGemm_BScale_Wmma_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 32, 1, 128, 16, 16, 128, 8, 8, 16, 16, 1, 1, S< 4, 8, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S< 4, 8, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, 1, 1, S<1, 16, 1, 2>, 4, Interwave, BlockGemmPipelineVersion::v1, half_t, half_t, false, false> //20
// clang-format on
>;
} // namespace instance
} // namespace device
} // namespace tensor_operation
} // namespace ck

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@@ -0,0 +1,31 @@
// SPDX-License-Identifier: MIT
// Copyright (c) 2025, Advanced Micro Devices, Inc. All rights reserved.
#include "device_gemm_b_scale_wmma_f16_i4_f16_mk_nk_mn.hpp"
namespace ck {
namespace tensor_operation {
namespace device {
namespace instance {
void add_device_gemm_b_scale_wmma_f16_i4_f16_mk_nk_mn_mem_v2_default_instances(
std::vector<std::unique_ptr<DeviceGemmV2BScale<Row,
Col,
Row,
F16,
I4,
F16,
F16,
1,
128,
PassThrough,
PassThrough,
PassThrough>>>& instances)
{
add_device_operation_instances(
instances, device_gemm_b_scale_wmma_f16_i4_f16_mk_nk_mn_mem_instances<GemmDefault>{});
}
} // namespace instance
} // namespace device
} // namespace tensor_operation
} // namespace ck

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@@ -1,5 +1,5 @@
// SPDX-License-Identifier: MIT
// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
// Copyright (c) 2018-2025, Advanced Micro Devices, Inc. All rights reserved.
#include "ck/ck.hpp"
#include "ck/tensor_operation/gpu/device/gemm_specialization.hpp"
@@ -46,7 +46,7 @@ using device_gemm_b_scale_xdl_f16_i4_f16_mk_nk_mn_mem_instances = std::tuple<
//#########################| | | | Type| Type| Data| Type| Type| Type| Elementwise| Elementwise| Elementwise|Specialization| Size| Block| Block| Block| Block| Block| | | XDL| XDL| Per| Per| ThreadCluster| ThreadCluster| SrcAccessOrder| SrcVectorDim| SrcScalar| DstScalar| AddExtraM| ThreadCluster| ThreadCluster| SrcAccessOrder| SrcVectorDim| SrcScalar| DstScalar| AddExtraN| MXdlPerWave| NXdlPerWave| _MBlock_MXdlPerWave_MWaveMPerXdl| ScalarPerVector| Pipeline| Pipeline|
//#########################| | | | | | Type| | | | Operation| Operation| Operation| | | N| K| | | | | |Wave| Wave| | | Lengths_K0_M_K1| ArrangeOrder| | | PerVector| PerVector_K1| | Lengths_K0_N_K1| ArrangeOrder| | | PerVector| PerVector_K1| | PerShuffle| PerShuffle| _NBlock_NXdlPerWave_NWaveNPerXdl| _NWaveNPerXdl| Scheduler| Verision|
//#########################| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
//Compute friendly
DeviceGemm_Xdl_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 256, 1, 128, 128, 128, 128, 8, 32, 32, 32, 2, 2, S<16, 16, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S<4, 64, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 32, 32, 0, 1, 1, S<1, 32, 1, 8>, 8, BlkGemmPipeSched, BlockGemmPipelineVersion::v3, half_t, half_t, false, false>, //0
DeviceGemm_Xdl_CShuffleV3< Row, Col, Row, F16, I4, F16, F16, F32, F16, PassThrough, PassThrough, PassThrough, GemmSpec, 256, 1, 128, 128, 128, 64, 8, 32, 32, 32, 2, 2, S<8, 32, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 8, 8, 0, S<2, 128, 1>, S<1, 0, 2>, S<1, 0, 2>, 2, 32, 32, 0, 1, 1, S<1, 32, 1, 8>, 8, BlkGemmPipeSched, BlockGemmPipelineVersion::v4, half_t, half_t, false, false>, //1