105 lines
3.2 KiB
Markdown
105 lines
3.2 KiB
Markdown
# VCS编译加速：三步编译和分块编译
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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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### 第一次编译
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```bash
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make all 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 GENLIB=0
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```
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## 运行结果
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```
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Top Level Modules:
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testbench
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TimeScale is 1 ns / 1 ps
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Note-[PC_SHARED] Reusing shared partition
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Reusing partition '_vcs_pc_package_' from shared library './partitionlib'.
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Note-[PC_SHARED] Reusing shared partition
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Reusing partition 'uvm_pkg' from shared library './partitionlib'.
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Note-[PC_SHARED] Reusing shared partition
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Reusing partition 'counter_a' from shared library './partitionlib'.
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Warning-[PC_NOT_SHARED] Cannot reuse shared partition
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Cannot reuse partition 'counter_b' from shared library './partitionlib'
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There are additional signals that are now targets of hierarchical
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references.
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Note-[PC_GEN_PARTITION] Generating partition
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Generating new partition 'counter_b' at
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'./partitionlib_test2/counter_b_ipFRWc'.
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Warning-[PC_NOT_SHARED] Cannot reuse shared partition
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Cannot reuse partition 'counter_c' from shared library './partitionlib'
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There are additional signals that are now targets of hierarchical
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references.
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Note-[PC_GEN_PARTITION] Generating partition
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Generating new partition 'counter_c' at
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'./partitionlib_test2/counter_c_chn5zb'.
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Note-[PC_SHARED] Reusing shared partition
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Reusing partition 'top' from shared library './partitionlib'.
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Warning-[PC_NOT_SHARED] Cannot reuse shared partition
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Cannot reuse partition 'TB.testbench' from shared library './partitionlib'
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Modified Design Units :
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TB.testbench : "./rtl/testbench.sv", 20
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Type of targets of hierarchical references in this partition have changed.
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Note-[PC_RECOMPILE] Recompiling partition
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Recompiling partition 'TB.testbench' because of following changes.
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Modified Design Units :
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TB.testbench : "./rtl/testbench.sv", 20
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```
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检查log可以发现，穿层信号变化涉及到的模块`counter_b、counter_c`都无法reuse。
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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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