TMATMUL

指令示意图

TMATMUL tile operation

简介

矩阵乘法 (GEMM),生成累加器/输出 Tile。

数学语义

设:

  • M = aMatrix.GetValidRow()
  • K = aMatrix.GetValidCol()
  • N = bMatrix.GetValidCol()

对于 0 <= i < M0 <= j < N(有效矩阵乘法域中的输出元素):

\[ \mathrm{C}_{i,j} = \sum_{k=0}^{K-1} \mathrm{A}_{i,k} \cdot \mathrm{B}_{k,j} \]

精确的累加器行为和数据类型提升由目标/实现定义。

汇编语法

PTO-AS 形式:参见 PTO-AS 规范

同步形式:

%acc = tmatmul %a, %b : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

AS Level 1(SSA)

%c = pto.tmatmul %a, %b : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

AS Level 2(DPS)

pto.tmatmul ins(%a, %b : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%c : !pto.tile_buf<...>)

C++ 内建接口

声明于 include/pto/common/pto_instr.hpp

template <typename TileRes, typename TileLeft, typename TileRight, typename... WaitEvents>
PTO_INST RecordEvent TMATMUL(TileRes &cMatrix, TileLeft &aMatrix, TileRight &bMatrix, WaitEvents &... events);

template <AccPhase Phase, typename TileRes, typename TileLeft, typename TileRight, typename... WaitEvents>
PTO_INST RecordEvent TMATMUL(TileRes &cMatrix, TileLeft &aMatrix, TileRight &bMatrix, WaitEvents &... events);

约束

  • 实现检查 (A2A3):
    • 支持的 (CType, AType, BType) 三元组:
    • (int32_t, int8_t, int8_t)
    • (float, half, half)
    • (float, float, float)
    • (float, bfloat16_t, bfloat16_t)
    • 静态形状约束:TileLeft::Rows == TileRes::RowsTileLeft::Cols == TileRight::RowsTileRight::Cols == TileRes::Cols
    • Tile 位置:TileLeft::Loc == LeftTileRight::Loc == RightTileRes::Loc == Acc
    • 运行时:m/k/n(取自 aMatrix.GetValidRow()aMatrix.GetValidCol()bMatrix.GetValidCol())必须在 [1, 4095] 范围内。
  • 实现检查 (A5):
    • 累加器类型必须是 int32_tfloat
    • 如果是 int32_tAType == int8_tBType == int8_t
    • 如果是 float:支持 half/bfloat16_t/float 和选定的 fp8 对(目标定义)。
    • 静态形状约束:TileLeft::Rows == TileRes::RowsTileLeft::Cols == TileRight::RowsTileRight::Cols == TileRes::Cols
    • 强制执行分形/布局约束:
    • Left:Loc == Left!isRowMajorSFractal == RowMajor
    • Right:Loc == RightisRowMajorSFractal == ColMajor
    • Acc:Loc == Acc!isRowMajorSFractal == RowMajor
    • 运行时:m/k/n(取自 aMatrix.GetValidRow()aMatrix.GetValidCol()bMatrix.GetValidCol())必须在 [1, 4095] 范围内。

示例

自动(Auto)

#include <pto/pto-inst.hpp>

using namespace pto;

void example_auto() {
  using A = TileLeft<half, 16, 16>;
  using B = TileRight<half, 16, 16>;
  using C = TileAcc<float, 16, 16>;
  A a;
  B b;
  C c;
  TMATMUL(c, a, b);
}

手动(Manual)

#include <pto/pto-inst.hpp>

using namespace pto;

void example_manual() {
  using A = TileLeft<half, 16, 16>;
  using B = TileRight<half, 16, 16>;
  using C = TileAcc<float, 16, 16>;
  A a;
  B b;
  C c;
  TASSIGN(a, 0x1000);
  TASSIGN(b, 0x2000);
  TASSIGN(c, 0x3000);
  TMATMUL(c, a, b);
}

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。
%c = pto.tmatmul %a, %b : (!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)
%c = pto.tmatmul %a, %b : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>

PTO 汇编形式

%acc = tmatmul %a, %b : (!pto.tile<...>, !pto.tile<...>) -> !pto.tile<...>
# AS Level 2 (DPS)
pto.tmatmul ins(%a, %b : !pto.tile_buf<...>, !pto.tile_buf<...>) outs(%c : !pto.tile_buf<...>)