TROWEXPAND

Instruction Diagram

Introduction

Broadcasts the first element of each source row to the destination row.

Mathematical Semantics

Assume R = dst.GetValidRow() and C = dst.GetValidCol(). For 0 <= i < R and 0 <= j < C:

$$\mathrm{dst}_{i,j} = \mathrm{src}_{i,0}$$

Assembly Syntax

Synchronous form:

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

AS Level 1 (SSA)

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

AS Level 2 (DPS)

pto.trowexpand ins(%src : !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)

C++ Built-in APIs

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

The public include header is <pto/pto-inst.hpp>, and the internal declaration is located in pto/common/pto_instr.hpp.

template <typename TileDataDst, typename TileDataSrc, typename... WaitEvents>
PTO_INST RecordEvent TROWEXPAND(TileDataDst &dst, TileDataSrc &src, WaitEvents &... events);

Constraints

Implementation check (NPU):

• Tile type: dst and src must be TileType::Vec.
• Tile layout: src and dst are both ND fractals (isRowMajor and SLayout::NoneBox).
• Data type: For Atlas A2/A3 training products/Atlas A2/A3 inference products/Ascend 950PR/Ascend 950DT, the element type must be one of the following: int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, half, bfloat16_t, float.
• Runtime valid region check:
  • Atlas A2/A3 training products/Atlas A2/A3 inference products: if any of dstValidRow, dstValidCol, srcValidRow, or srcValidCol is zero, return early.
  • Ascend 950PR/Ascend 950DT: assert srcValidRow == dstValidRow, and assert srcValidRow != 0 && srcValidCol != 0.

Examples

Automatic

#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, 16>;
  SrcT src;
  DstT dst;
  TROWEXPAND(dst, src);
}

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, 16>;
  SrcT src;
  DstT dst;
  TASSIGN(src, 0x1000);
  TASSIGN(dst, 0x2000);
  TROWEXPAND(dst, src);
}

ASM Examples

Automatic Mode

# Automatic mode: the compiler/runtime handles resource placement and scheduling.
%dst = pto.trowexpand %src : !pto.tile<...> -> !pto.tile<...>

Manual Mode

# Manual mode: explicitly bind resources first, then issue the instruction.
# Optional (when the instruction contains tile operands):
# pto.tassign %arg0, @tile(0x1000)
# pto.tassign %arg1, @tile(0x2000)
%dst = pto.trowexpand %src : !pto.tile<...> -> !pto.tile<...>

PTO Assembly Form

%dst = trowexpand %src : !pto.tile<...> -> !pto.tile<...>
# AS Level 2 (DPS)
pto.trowexpand ins(%src : !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)