TSELS

Tile Operation Diagram

Introduction

Select between source tile and scalar using a mask tile (per-element selection for source tile).

Math Interpretation

For each element (i, j) in the valid region:

$${\mathrm{d}\mathrm{s}\mathrm{t}}_{i,j}=\{\begin{array}{ll}{\mathrm{s}\mathrm{r}\mathrm{c}}_{i,j}& \text{if }{\mathrm{m}\mathrm{a}\mathrm{s}\mathrm{k}}_{i,j}\text{is true}\\ \mathrm{s}\mathrm{c}\mathrm{a}\mathrm{l}\mathrm{a}\mathrm{r}& \text{otherwise}\end{array}$$

Assembly Syntax

Synchronous form:

%dst = tsels %mask, %src, %scalar : !pto.tile<...>

AS Level 1 (SSA)

%dst = pto.tsels %mask, %src, %scalar : (!pto.tile<...>, !pto.tile<...>, dtype) -> !pto.tile<...>

AS Level 2 (DPS)

pto.tsels ins(%mask, %src, %scalar : !pto.tile_buf<...>, !pto.tile_buf<...>, dtype) outs(%dst : !pto.tile_buf<...>)

C++ Intrinsic

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

template <typename TileDataDst, typename TileDataMask, typename TileDataSrc, typename TileDataTmp, typename... WaitEvents>
PTO_INST RecordEvent TSELS(TileDataDst &dst, TileDataMask &mask, TileDataSrc &src, TileDataTmp &tmp, typename TileDataSrc::DType scalar, WaitEvents &... events);

Constraints

• Implementation checks (A2A3):
  • sizeof(TileDataDst::DType) must be 2 or 4 bytes.
  • Supported data types are half, float16_t, float, and float32_t.
  • dst and src must use the same element type.
  • dst and src must be row-major.
  • Runtime: src.GetValidRow()/GetValidCol() must match dst.GetValidRow()/GetValidCol().
• Implementation checks (A5):
  • sizeof(TileDataDst::DType) may be 1, 2, or 4 bytes.
  • Supported data types are int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, half, and float.
  • dst and src must use the same element type.
  • dst, mask, and src must be row-major.
  • Runtime: src.GetValidRow()/GetValidCol() must match dst.GetValidRow()/GetValidCol().
• Valid region:
  • The op uses dst.GetValidRow() / dst.GetValidCol() as the iteration domain.
• Mask encoding:
  • The mask tile is interpreted as packed predicate bits in a target-defined layout.

Examples

Auto

#include <pto/pto-inst.hpp>

using namespace pto;

void example_auto() {
  using TileDst = Tile<TileType::Vec, float, 16, 16>;
  using TileSrc = Tile<TileType::Vec, float, 16, 16>;
  using TileTmp = Tile<TileType::Vec, float, 16, 16>;
  using TileMask = Tile<TileType::Vec, uint8_t, 16, 32, BLayout::RowMajor, -1, -1>;
  TileDst dst;
  TileSrc src;
  TileTmp tmp;
  TileMask mask(16, 2);
  float scalar = 0.0f;
  TSELS(dst, mask, src, tmp, scalar);
}

Manual

#include <pto/pto-inst.hpp>

using namespace pto;

void example_manual() {
  using TileDst = Tile<TileType::Vec, float, 16, 16>;
  using TileSrc = Tile<TileType::Vec, float, 16, 16>;
  using TileTmp = Tile<TileType::Vec, float, 16, 16>;
  using TileMask = Tile<TileType::Vec, uint8_t, 16, 32, BLayout::RowMajor, -1, -1>;
  TileDst dst;
  TileSrc src;
  TileTmp tmp;
  TileMask mask(16, 2);
  float scalar = 0.0f;
  TASSIGN(src, 0x1000);
  TASSIGN(tmp, 0x2000);
  TASSIGN(dst, 0x3000);
  TASSIGN(mask, 0x4000);
  TSELS(dst, mask, src, tmp, scalar);
}

ASM Form Examples

Auto Mode

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

Manual Mode

# Manual mode: resources must be bound explicitly before issuing the instruction.
# Optional for tile operands:
# pto.tassign %arg0, @tile(0x1000)
# pto.tassign %arg1, @tile(0x2000)
%dst = pto.tsels %mask, %src, %scalar : (!pto.tile<...>, !pto.tile<...>, dtype) -> !pto.tile<...>

PTO Assembly Form

%dst = tsels %mask, %src, %scalar : !pto.tile<...>
# AS Level 2 (DPS)
pto.tsels ins(%mask, %src, %scalar : !pto.tile_buf<...>, !pto.tile_buf<...>, dtype) outs(%dst : !pto.tile_buf<...>)