pto.tands

pto.tands is part of the Tile Scalar And Immediate instruction set.

Summary

Elementwise bitwise AND of a tile and a scalar.

Mechanism

Elementwise bitwise AND of a tile and a scalar. It operates on tile payloads rather than scalar control state, and its legality is constrained by tile shape, layout, valid-region, and target-profile support.

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

\[ \mathrm{dst}_{i,j} = \mathrm{src}_{i,j} \;\&\; \mathrm{scalar} \]

Syntax

Textual spelling is defined by the PTO ISA syntax-and-operands pages.

Synchronous form:

%dst = tands %src, %scalar : !pto.tile<...>, i32

AS Level 1 (SSA)

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

AS Level 2 (DPS)

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

C++ Intrinsic

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

template <typename TileDataDst, typename TileDataSrc, typename... WaitEvents>
PTO_INST RecordEvent TANDS(TileDataDst &dst, TileDataSrc &src, typename TileDataDst::DType scalar, WaitEvents &... events);

Inputs

  • src is the source tile.
  • scalar is the scalar value broadcast to all lanes.
  • dst names the destination tile.
  • The operation iterates over dst's valid region.

Expected Outputs

dst carries the result tile or updated tile payload produced by the operation.

Side Effects

No architectural side effects beyond producing the destination tile. Does not implicitly fence unrelated traffic.

Constraints

Constraints

  • Valid region:
    • The op uses dst.GetValidRow() / dst.GetValidCol() as the iteration domain.

Exceptions

Exceptions

  • Illegal operand tuples, unsupported types, invalid layout combinations, or unsupported target-profile modes are rejected by the verifier or by the selected backend instruction set.
  • Programs must not rely on behavior outside the documented legal domain of this operation, even if one backend currently accepts it.

Target-Profile Restrictions

Target-Profile Restrictions

  • Implementation checks (A2A3):

    • Intended for integral element types.
    • dst and src must use the same element type.
    • dst and src must be vector tiles.
    • Runtime: src.GetValidRow() == dst.GetValidRow() and src.GetValidCol() == dst.GetValidCol().
    • In manual mode, setting the source tile and destination tile to the same memory is unsupported.

  • Implementation checks (A5):

    • Intended for integral element types supported by TEXPANDS and TAND.
    • dst and src must use the same element type.
    • dst and src must be vector tiles.
    • In manual mode, setting the source tile and destination tile to the same memory is unsupported.

Examples

#include <pto/pto-inst.hpp>

using namespace pto;

void example() {
  using TileDst = Tile<TileType::Vec, uint16_t, 16, 16>;
  using TileSrc = Tile<TileType::Vec, uint16_t, 16, 16>;
  TileDst dst;
  TileSrc src;
  TANDS(dst, src, 0xffu);
}

Auto Mode

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

PTO Assembly Form

%dst = tands %src, %scalar : !pto.tile<...>, i32
# AS Level 2 (DPS)
pto.tands ins(%src, %scalar : !pto.tile_buf<...>, dtype) outs(%dst : !pto.tile_buf<...>)