TROWMAX
指令示意图
简介
通过取列间最大值来归约每一行。
数学语义
Let R = src.GetValidRow() and C = src.GetValidCol(). For 0 <= i < R:
dsti,0=max0≤j<Csrci,j\mathrm{dst}_{i,0} = \max_{0 \le j < C} \mathrm{src}_{i,j}
汇编语法
PTO-AS 形式:参见 PTO-AS 规范。
同步形式:
%dst = trowmax %src : !pto.tile<...> -> !pto.tile<...>
Lowering may introduce internal scratch tiles; the C++ intrinsic requires an explicit tmp operand.
AS Level 1(SSA)
%dst = pto.trowmax %src, %tmp : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>
AS Level 2(DPS)
pto.trowmax ins(%src, %tmp : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)
C++ 内建接口
声明于 include/pto/common/pto_instr.hpp:
template <typename TileDataOut, typename TileDataIn, typename TileDataTmp, typename... WaitEvents>
PTO_INST RecordEvent TROWMAX(TileDataOut& dst, TileDataIn& src, TileDataTmp& tmp, WaitEvents&... events);
约束
实现检查 (NPU):
- A2A3:
- Tile 位置:
dst且src必须是TileType::Vec. - Tile 布局 of
src: ND fractal (isRowMajor且SLayout::NoneBox)。 - Tile 布局 of
dst:- 推荐: DN layout Tile of 1D, 例如,
Tile<TileType::Vec, T, ROWS, 1, BLayout::ColMajor, ValidRows, 1> - 将移除: ND layout Tile of 2D, 例如,
Tile<TileType::Vec, T, ROWS, COLS, BLayout::RowMajor, ValidRows, 1>
- 推荐: DN layout Tile of 1D, 例如,
- 数据类型:
half或float. - 数据类型一致性:
dst.DType == src.DType. - 运行期有效区域检查:
srcValidCol != 0且srcValidRow != 0.srcValidRow == dstValidRow(the output valid row 必须匹配 the input valid row).
- Tile 位置:
- A5:
- 数据类型:
half或float. - 数据类型一致性:
dst.DType == src.DType. - No explicit runtime assertions on
validRow/validCol在实现中; the loops usesrc.GetValidRow()且src.GetValidCol().
- 数据类型:
示例
自动(Auto)
#include <pto/pto-inst.hpp>
using namespace pto;
void example_auto() {
using SrcT = Tile<TileType::Vec, float, 16, 16>;
using DstT = Tile<TileType::Vec, float, 16, 1, BLayout::ColMajor>;
using TmpT = Tile<TileType::Vec, float, 16, 16>;
SrcT src;
DstT dst;
TmpT tmp;
TROWMAX(dst, src, tmp);
}
手动(Manual)
#include <pto/pto-inst.hpp>
using namespace pto;
void example_manual() {
using SrcT = Tile<TileType::Vec, float, 16, 16>;
using DstT = Tile<TileType::Vec, float, 16, 1, BLayout::ColMajor>;
using TmpT = Tile<TileType::Vec, float, 16, 16>;
SrcT src;
DstT dst;
TmpT tmp;
TASSIGN(src, 0x1000);
TASSIGN(dst, 0x2000);
TASSIGN(tmp, 0x3000);
TROWMAX(dst, src, tmp);
}
汇编示例(ASM)
自动模式
# 自动模式:由编译器/运行时负责资源放置与调度。
%dst = pto.trowmax %src, %tmp : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>
手动模式
# 手动模式:先显式绑定资源,再发射指令。
# 可选(当该指令包含 tile 操作数时):
# pto.tassign %arg0, @tile(0x1000)
# pto.tassign %arg1, @tile(0x2000)
%dst = pto.trowmax %src, %tmp : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>
PTO 汇编形式
%dst = trowmax %src : !pto.tile<...> -> !pto.tile<...>
# IR Level 2 (DPS)
pto.trowmax ins(%src, %tmp : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%dst : !pto.tile_buf<...>)