TSUBS

Instruction Diagram

Introduction

Subtracts a scalar from each element in the tile.

Mathematical Semantics

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

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

Assembly Syntax

Synchronous form:

%dst = tsubs %src, %scalar : !pto.tile<...>, f32

AS Level 1 (SSA)

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

AS Level 2 (DPS)

pto.tsubs ins(%src, %scalar : !pto.tile_buf<...>, dtype) 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 TSUBS(TileDataDst &dst, TileDataSrc &src0, typename TileDataSrc::DType scalar, WaitEvents &... events);

Constraints

• Implementation check (Atlas A2/A3 training products/Atlas A2/A3 inference products):
  • TileData::DType must be one of the following: int32_t, int, int16_t, half, float16_t, float, float32_t.
  • The tile position must be a vector (TileData::Loc == TileType::Vec).
  • Runtime: src0.GetValidRow() == dst.GetValidRow() and src0.GetValidCol() == dst.GetValidCol().
• Implementation check (Ascend 950PR/Ascend 950DT):
  • TileData::DType must be one of the following: uint8_t, int8_t, uint16_t, int16_t, uint32_t, int32_t, half, float, bfloat16_t.
  • The tile position must be a vector (TileDataDst::Loc == TileType::Vec and TileDataSrc::Loc == TileType::Vec).
  • Static valid boundary: TileDataDst::ValidRow <= TileDataDst::Rows, TileDataDst::ValidCol <= TileDataDst::Cols, TileDataSrc::ValidRow <= TileDataSrc::Rows, and TileDataSrc::ValidCol <= TileDataSrc::Cols.
  • Runtime: src0.GetValidRow() == dst.GetValidRow() and src0.GetValidCol() == dst.GetValidCol().
• General constraints:
  • dst and src0 must use the same element type.
  • The scalar type must match TileDataSrc::DType.
• Valid region:
  • This operation uses dst.GetValidRow()/dst.GetValidCol() as the iteration domain.

Examples

#include <pto/pto-inst.hpp>

using namespace pto;

void example() {
  using TileT = Tile<TileType::Vec, float, 16, 16>;
  TileT x, out;
  TSUBS(out, x, 1.0f);
}

ASM Examples

Automatic Mode

# Automatic mode: the compiler/runtime handles resource placement and scheduling.
%dst = pto.tsubs %src, %scalar : (!pto.tile<...>, dtype) -> !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.tsubs %src, %scalar : (!pto.tile<...>, dtype) -> !pto.tile<...>

PTO Assembly Form

%dst = tsubs %src, %scalar : !pto.tile<...>, f32
# AS Level 2 (DPS)
pto.tsubs ins(%src, %scalar : !pto.tile_buf<...>, dtype) outs(%dst : !pto.tile_buf<...>)