TROWSUM¶

Tile Operation Diagram¶

Introduction¶

Reduce each row by summing across columns.

Math Interpretation¶

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

Assembly Syntax¶

PTO-AS form: see PTO-AS Specification.

Synchronous form:

%dst = trowsum %src : !pto.tile<...> -> !pto.tile<...>

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

IR Level 1 (SSA)¶

%dst = pto.trowsum %src, %tmp : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

IR Level 2 (DPS)¶

pto.trowsum ins(%src, %tmp : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)

C++ Intrinsic¶

Declared in include/pto/common/pto_instr.hpp:

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

Constraints¶

Implementation checks (NPU):

• A2A3:
• Tile location: dst and src must be TileType::Vec.
• Tile layout of src: ND fractal (isRowMajor and SLayout::NoneBox).
• Tile layout of dst:
  • Recommended: DN layout Tile of 1D, e.g., Tile<TileType::Vec, T, ROWS, 1, BLayout::ColMajor, ValidRows, 1>
  • To be removed: ND layout Tile of 2D, e.g., Tile<TileType::Vec, T, ROWS, COLS, BLayout::RowMajor, ValidRows, 1>
• Data types: half or float.
• DType consistency: dst.DType == src.DType.
• Runtime valid checks:
  • srcValidCol != 0 and srcValidRow != 0.
  • srcValidRow == dstValidRow (the output valid row must match the input valid row).
• A5:
• Data types: half or float.
• DType consistency: dst.DType == src.DType.
• No explicit runtime assertions on validRow/validCol in the implementation; the loops use src.GetValidRow() and src.GetValidCol().

Examples¶

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, 16, 1, BLayout::ColMajor>;
  using TmpT = Tile<TileType::Vec, float, 16, 16>;
  SrcT src;
  DstT dst;
  TmpT tmp;
  TROWSUM(dst, src, tmp);
}

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, 16, 1, BLayout::ColMajor>;
  using TmpT = Tile<TileType::Vec, float, 16, 16>;
  SrcT src;
  DstT dst;
  TmpT tmp;
  TASSIGN(src, 0x1000);
  TASSIGN(dst, 0x2000);
  TASSIGN(tmp, 0x3000);
  TROWSUM(dst, src, tmp);
}

ASM Form Examples¶

Auto Mode¶

# Auto mode: compiler/runtime-managed placement and scheduling.
%dst = pto.trowsum %src, %tmp : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

Manual Mode¶

# Manual mode: bind resources explicitly before issuing the instruction.
# Optional for tile operands:
# pto.tassign %arg0, @tile(0x1000)
# pto.tassign %arg1, @tile(0x2000)
%dst = pto.trowsum %src, %tmp : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

PTO Assembly Form¶

%dst = trowsum %src : !pto.tile<...> -> !pto.tile<...>
# IR Level 2 (DPS)
pto.trowsum ins(%src, %tmp : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)