162 lines
3.7 KiB
Markdown
162 lines
3.7 KiB
Markdown
# VCS分块编译：穿层引用对重用效果的影响
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验证问题：有不同穿层信号时，模块的partition库能否reuse?
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结论：**当穿层信号变化时，受影响的模块不能reuse**。
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## 快速开始
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`LAB` ：实验序号，可选值[1,2,3,4]
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### 第一次编译
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```bash
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make all LAB=1 GENLIB=1
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```
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### 第二次编译
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```bash
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make all LAB=1 GENLIB=0
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```
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## 实验框架
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### 实验一
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```mermaid
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flowchart LR
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tb["testbench1"]
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dut["top"]
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tb --> dut
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dut --> ca
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dut ----> cb
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dut ------> cc
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tb -.第一次.-> namea
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tb -.第二次.-> namea
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tb -.第二次.-> nameb
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tb -.第二次.-> namec
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subgraph ca[counter_a]
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direction LR
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namea["name = counter_a"]
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agea["age = 10"]
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end
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subgraph cb[counter_b]
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direction LR
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nameb["name = counter_b"]
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ageb["age = 11"]
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end
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subgraph cc[counter_c]
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direction LR
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namec["name = counter_c"]
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agec["age = 12"]
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end
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```
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### 实验二
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```mermaid
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flowchart LR
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tb["testbench2"]
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dut["top"]
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tb --> dut
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dut --> ca
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dut ----> cb
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dut ------> cc
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tb -.第一次.-> namea
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tb -.第二次.-> agea
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subgraph ca[counter_a]
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direction LR
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namea["name = counter_a"]
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agea["age = 10"]
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end
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subgraph cb[counter_b]
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direction LR
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nameb["name = counter_b"]
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ageb["age = 11"]
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end
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subgraph cc[counter_c]
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direction LR
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namec["name = counter_c"]
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agec["age = 12"]
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end
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```
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### 实验三
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```mermaid
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flowchart LR
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tb["testbench3"]
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dut["top"]
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tb --> dut
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dut --> ca
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dut ----> cb
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dut ------> cc
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tb -.第一次.-> namea
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tb -.第一次.-> agea
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tb -.第二次.-> namea
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subgraph ca[counter_a]
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direction LR
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namea["name = counter_a"]
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agea["age = 10"]
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end
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subgraph cb[counter_b]
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direction LR
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nameb["name = counter_b"]
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ageb["age = 11"]
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end
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subgraph cc[counter_c]
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direction LR
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namec["name = counter_c"]
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agec["age = 12"]
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end
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```
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### 实验四
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```mermaid
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flowchart LR
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tb["testbench4"]
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dut["top"]
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tb --> dut
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dut --> ca
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dut ----> cb
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dut ------> cc
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tb -.第一次.-> namea
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tb -.第二次.-> namea
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tb -.第二次.-> agea
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subgraph ca[counter_a]
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direction LR
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namea["name = counter_a"]
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agea["age = 10"]
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end
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subgraph cb[counter_b]
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direction LR
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nameb["name = counter_b"]
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ageb["age = 11"]
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end
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subgraph cc[counter_c]
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direction LR
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namec["name = counter_c"]
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agec["age = 12"]
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end
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```
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## 结论
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| 序号 | 条件 | 现象 | 结论 | 备注 |
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| ---- | ----------------------------------------------------- | ------- | ---------------------------- | ---- |
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| 1 | 第一次：引用a.name； 第二次引用a.name/b.name/c.name； | b/c重编 | 不同的模块，增加的引用会重编 | |
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| 2 | 第一次：引用a.name；第二次引用a.age； | a重编 | 同一个模块，不同引用也会重编 | |
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| 3 | 第一次：引用a.name/a.age；第二次引用a.name； | a重编 | 同一个模块，减少引用也会重编 | |
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| 4 | 第一次：引用a.name；第二次引用a.name/a.age； | a重编 | 同一个模块，增加引用也会重编 | |
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⚠：只要模块的穿层引用发生变化，就会导致该模块重编。
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✍官方文档VCSLCAFeatures.pdf第408页，也有类似表述：Any change in XMRs, trigger recompilation of the referee partition.
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