TPARTMIN

Tile Operation Diagram

Introduction

Performs elementwise minimum selection over the destination valid region. When both src0 and src1 are valid at an element, the result is min(src0, src1); when only one input is valid there, the result copies that input value. Handling of other mismatched-validity cases is implementation-defined.

Math Interpretation

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

$${\mathrm{d}\mathrm{s}\mathrm{t}}_{i,j}=\{\begin{array}{ll}\min ({\mathrm{s}\mathrm{r}\mathrm{c}0}_{i,j},{\mathrm{s}\mathrm{r}\mathrm{c}1}_{i,j})& \text{if both inputs are defined at }(i,j)\\ {\mathrm{s}\mathrm{r}\mathrm{c}0}_{i,j}& \text{if only src0 is defined at }(i,j)\\ {\mathrm{s}\mathrm{r}\mathrm{c}1}_{i,j}& \text{if only src1 is defined at }(i,j)\end{array}$$

Assembly Syntax

Synchronous form:

%dst = tpartmin %src0, %src1 : !pto.tile<...> -> !pto.tile<...>

AS Level 1 (SSA)

%dst = pto.tpartmin %src0, %src1 : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

AS Level 2 (DPS)

pto.tpartmin ins(%src0, %src1 : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)

C++ Intrinsic

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

template <typename TileDataDst, typename TileDataSrc0, typename TileDataSrc1, typename... WaitEvents>
PTO_INST RecordEvent TPARTMIN(TileDataDst &dst, TileDataSrc0 &src0, TileDataSrc1 &src1, WaitEvents &... events);

Constraints

General constraints / checks

• dst, src0, and src1 must use the same element type.
• The destination valid region defines the result domain.
• For each element in the destination valid region:
  • if both inputs are valid, the instruction applies the elementwise minimum;
  • if only one input is valid, the result copies that input value.
• If dst has a zero valid region, the instruction returns early.
• Supported partial-validity patterns require at least one source tile to have a valid region exactly equal to dst, while the other source tile's valid region must not exceed dst in either dimension.
• Handling of any validity pattern not explicitly listed above is implementation-defined.

A2A3 implementation checks

• Supported element types: int32_t, int16_t, half, float.
• dst, src0, and src1 must all be row-major (isRowMajor).

A5 implementation checks

• Supported element types: int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, half, bfloat16_t, float.

Examples

Auto

#include <pto/pto-inst.hpp>

using namespace pto;

void example_auto() {
  using TileT = Tile<TileType::Vec, float, 16, 16>;
  TileT src0, src1, dst;
  TPARTMIN(dst, src0, src1);
}

Manual

#include <pto/pto-inst.hpp>

using namespace pto;

void example_manual() {
  using TileT = Tile<TileType::Vec, float, 16, 16>;
  TileT src0, src1, dst;
  TASSIGN(src0, 0x1000);
  TASSIGN(src1, 0x2000);
  TASSIGN(dst,  0x3000);
  TPARTMIN(dst, src0, src1);
}

ASM Form Examples

Auto Mode

# Auto mode: compiler/runtime-managed placement and scheduling.
%dst = pto.tpartmin %src0, %src1 : (!pto.tile<...>, !pto.tile<...>) -> !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.tpartmin %src0, %src1 : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

PTO Assembly Form

%dst = tpartmin %src0, %src1 : !pto.tile<...> -> !pto.tile<...>
# AS Level 2 (DPS)
pto.tpartmin ins(%src0, %src1 : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)