TCOLMIN

Tile Operation Diagram

TCOLMIN tile operation

Introduction

Reduce each column by taking the minimum across rows.

Math Interpretation

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

\[ \mathrm{dst}_{0,j} = \min_{0 \le i < R} \mathrm{src}_{i,j} \]

Assembly Syntax

PTO-AS form: see PTO-AS Specification.

Synchronous form:

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

IR Level 1 (SSA)

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

IR Level 2 (DPS)

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

C++ Intrinsic

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

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

Constraints

Implementation checks (NPU):

  • Tile location: dst and src must be TileType::Vec.
  • Tile layout: both tiles must be ND fractal (isRowMajor and SLayout::NoneBox).
  • Data types:
  • A2A3: half, float, int16_t, int32_t.
  • A5: half, float, int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, bfloat16_t.
  • DType consistency: dst.DType == src.DType.
  • Runtime valid checks:
  • src.GetValidCol() == dst.GetValidCol().
  • If src.GetValidRow() == 0 or src.GetValidCol() == 0, the implementation returns early.

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, 1, 16>;
  SrcT src;
  DstT dst;
  TCOLMIN(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, 1, 16>;
  SrcT src;
  DstT dst;
  TASSIGN(src, 0x1000);
  TASSIGN(dst, 0x2000);
  TCOLMIN(dst, src);
}

ASM Form Examples

Auto Mode

# Auto mode: compiler/runtime-managed placement and scheduling.
%dst = pto.tcolmin %src : !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.tcolmin %src : !pto.tile<...> -> !pto.tile<...>

PTO Assembly Form

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