TRSQRT¶

指令示意图¶

简介¶

逐元素倒数平方根。

数学语义¶

对每个元素 (i, j) 在有效区域内：

汇编语法¶

PTO-AS 形式：参见 PTO-AS Specification.

同步形式：

%dst = trsqrt %src : !pto.tile<...>

AS Level 1 (SSA)¶

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

AS Level 2 (DPS)¶

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

AS Level 1（SSA）¶

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

AS Level 2（DPS）¶

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

C++ 内建接口¶

声明于 include/pto/common/pto_instr.hpp:

template <typename TileDataDst, typename TileDataSrc, typename... WaitEvents>
PTO_INST RecordEvent TRSQRT(TileDataDst &dst, TileDataSrc &src, WaitEvents &... events);

template <typename TileDataDst, typename TileDataSrc, typename TileDataTmp, typename... WaitEvents>
PTO_INST RecordEvent TRSQRT(TileDataDst &dst, TileDataSrc &src, TileDataTmp &tmp, WaitEvents &... events);

约束¶

• 实现检查 (NPU):
  • The tmp buffer must be at least 32 bytes. When tmp is provided, the high-precision version is executed.
  • TileData::DType must be one of: float or half;
  • Tile location must be vector (TileData::Loc == TileType::Vec);
  • Static valid bounds: TileData::ValidRow <= TileData::Rows and TileData::ValidCol <= TileData::Cols;
  • Runtime: src.GetValidRow() == dst.GetValidRow() and src.GetValidCol() == dst.GetValidCol();
  • Tile 布局 must be row-major (TileData::isRowMajor).
• 有效区域:
  • The op uses dst.GetValidRow() / dst.GetValidCol() as the iteration domain.
• Domain / NaN:
  • Behavior is target-defined (e.g., for src == 0 or negative inputs).

示例¶

自动（Auto）¶

#include <pto/pto-inst.hpp>

using namespace pto;

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

手动（Manual）¶

#include <pto/pto-inst.hpp>

using namespace pto;

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