TROWMAX

指令示意图

TROWMAX tile operation

简介

通过取列间最大值来归约每一行。

数学语义

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

dsti,0=max⁡0≤j<Csrci,j\mathrm{dst}_{i,0} = \max_{0 \le j < C} \mathrm{src}_{i,j}

汇编语法

PTO-AS 形式:参见 PTO-AS 规范

同步形式:

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

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

AS Level 1(SSA)

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

AS Level 2(DPS)

pto.trowmax ins(%src, %tmp : !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 TileDataTmp, typename... WaitEvents>
PTO_INST RecordEvent TROWMAX(TileDataOut& dst, TileDataIn& src, TileDataTmp& tmp, WaitEvents&... events);

约束

实现检查 (NPU):

  • A2A3:
    • Tile 位置: dstsrc 必须是 TileType::Vec.
    • Tile 布局 of src: ND fractal (isRowMajorSLayout::NoneBox)。
    • Tile 布局 of dst:
      • 推荐: DN layout Tile of 1D, 例如, Tile<TileType::Vec, T, ROWS, 1, BLayout::ColMajor, ValidRows, 1>
      • 将移除: ND layout Tile of 2D, 例如, Tile<TileType::Vec, T, ROWS, COLS, BLayout::RowMajor, ValidRows, 1>
    • 数据类型: halffloat.
    • 数据类型一致性: dst.DType == src.DType.
    • 运行期有效区域检查:
      • srcValidCol != 0srcValidRow != 0.
      • srcValidRow == dstValidRow (the output valid row 必须匹配 the input valid row).
  • A5:
    • 数据类型: halffloat.
    • 数据类型一致性: dst.DType == src.DType.
    • No explicit runtime assertions on validRow/validCol 在实现中; the loops use src.GetValidRow()src.GetValidCol().

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

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, 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);
  TROWMAX(dst, src, tmp);
}

汇编示例(ASM)

自动模式

# 自动模式:由编译器/运行时负责资源放置与调度。
%dst = pto.trowmax %src, %tmp : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

手动模式

# 手动模式:先显式绑定资源,再发射指令。
# 可选(当该指令包含 tile 操作数时):
# pto.tassign %arg0, @tile(0x1000)
# pto.tassign %arg1, @tile(0x2000)
%dst = pto.trowmax %src, %tmp : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

PTO 汇编形式

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