TCOLSUM¶

指令示意图¶

简介¶

通过对行求和来归约每一列。

数学语义¶

Let R = src.GetValidRow() and C = src.GetValidCol(). For 0 <= j < C:

isBinary selects the implementation path (binary-tree accumulation vs. sequential accumulation).

汇编语法¶

PTO-AS 形式：参见 PTO-AS Specification.

同步形式：

%dst = tcolsum %src {isBinary = false} : !pto.tile<...> -> !pto.tile<...>

Lowering may introduce internal scratch tiles; the C++ intrinsic requires an explicit tmp operand.

AS Level 1 (SSA)¶

%dst = pto.tcolsum %src : !pto.tile<...> -> !pto.tile<...>
%dst = pto.tcolsum %src, %tmp {isBinary = false} : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

AS Level 2 (DPS)¶

pto.tcolsum ins(%src : !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)
pto.tcolsum ins(%src, %tmp {isBinary = false} : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)

AS Level 1（SSA）¶

%dst = pto.tcolsum %src : !pto.tile<...> -> !pto.tile<...>
%dst = pto.tcolsum %src, %tmp {isBinary = false} : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

AS Level 2（DPS）¶

pto.tcolsum ins(%src : !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)
pto.tcolsum ins(%src, %tmp {isBinary = false} : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)

C++ 内建接口¶

声明于 include/pto/common/pto_instr.hpp:

template <typename TileDataOut, typename TileDataIn, typename... WaitEvents>
PTO_INST RecordEvent TCOLSUM(TileDataOut &dst, TileDataIn &src, WaitEvents &... events);

template <typename TileDataOut, typename TileDataIn, typename TileDataTmp, typename... WaitEvents>
PTO_INST RecordEvent TCOLSUM(TileDataOut &dst, TileDataIn &src, TileDataTmp &tmp, bool isBinary, WaitEvents &... events);

约束¶

实现检查 (NPU):

• Tile location: dst, src, tmp must be TileType::Vec.
• Tile 布局: all tiles must be ND fractal (isRowMajor and SLayout::NoneBox).
• 数据类型一致性:
  • A2A3: src.DType must be one of half, float, int16_t, int32_t, and dst.DType == tmp.DType == src.DType.
  • A5: dst.DType == src.DType is required by TColReduceCheck; the exact supported src.DType set is target-defined (see include/pto/npu/a5/TColReduceOps.hpp).
• 运行期有效区域检查:
  • A2A3: src.GetValidCol() == dst.GetValidCol(); returns early if src.GetValidRow() == 0 or src.GetValidCol() == 0.
  • A5: srcValidRow and srcValidCol must be non-zero; srcValidCol == dstValidCol is asserted by TColReduceCheck.

示例¶

自动（Auto）¶

#include <pto/pto-inst.hpp>

using namespace pto;

void example_auto() {
  using SrcT = Tile<TileType::Vec, float, 16, 16>;
  using DstT = Tile<TileType::Vec, float, 1, 16>;
  using TmpT = Tile<TileType::Vec, float, 16, 16>;
  SrcT src;
  DstT dst;
  TmpT tmp;
  TCOLSUM(dst, src, tmp, /*isBinary=*/false);
}

手动（Manual）¶

#include <pto/pto-inst.hpp>

using namespace pto;

void example_manual() {
  using SrcT = Tile<TileType::Vec, float, 16, 16>;
  using DstT = Tile<TileType::Vec, float, 1, 16>;
  using TmpT = Tile<TileType::Vec, float, 16, 16>;
  SrcT src;
  DstT dst;
  TmpT tmp;
  TASSIGN(src, 0x1000);
  TASSIGN(dst, 0x2000);
  TASSIGN(tmp, 0x3000);
  TCOLSUM(dst, src, tmp, /*isBinary=*/false);
}