TPREFETCH

指令示意图

TPREFETCH tile operation

简介

将数据从全局内存预取到 Tile 本地缓存/缓冲区（提示）。

数学语义

除非另有说明, semantics are defined over the valid region and target-dependent behavior is marked as implementation-defined.

汇编语法

PTO-AS 形式：参见 PTO-AS Specification.

同步形式：

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

AS Level 1 (SSA)

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

AS Level 2 (DPS)

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

AS Level 1（SSA）

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

AS Level 2（DPS）

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

C++ 内建接口

声明于 include/pto/common/pto_instr.hpp:

template <typename TileData, typename GlobalData>
PTO_INST RecordEvent TPREFETCH(TileData &dst, GlobalData &src);

约束

  • Semantics and caching behavior are target/implementation-defined.
  • Some targets may ignore prefetches or treat them as hints.

示例

See related examples in docs/isa/ and docs/coding/tutorials/.