paddle-pir-cinn
PIR & CINN 编译器
PIR (Paddle Intermediate Representation) 是 Paddle 的新一代中间表示，采用 MLIR 风格的 SSA 设计；CINN 是基于 PIR 的算子编译器，将高层算子编译为高性能 CUDA Kernel。
PIR 核心概念速查
| 概念 | 关键类 | 说明 |
|---|---|---|
| Type | TypeID / AbstractType / TypeStorage / Type |
类型系统：TypeID 用 static 变量地址做唯一标识，Type 本质是指向 TypeStorage 的指针，相等性通过指针比较 |
| Value | ValueImpl / OpResultImpl / OpOperandImpl |
SSA 值系统：OpResult 是算子输出(inline 0-5 / out-of-line)，OpOperand 通过侵入式双向链表管理 use-chain |
| Operation | Operation (连续内存布局) |
核心执行单元：`[OutOfLineResults |
| Block/Region | Block / Region |
Block 持有 Operation 列表 + BlockArgument + terminator；Region 是 Block 的容器，约束 Value 作用域 |
| Dialect | BuiltinDialect / PaddleDialect / CinnDialect |
模块化容器：聚合一组 Type、Attribute、Op 定义，支持独立注册与扩展 |
CINN 4 阶段编译流水线
PIR Program (pd_op.*)
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