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| author | Fangrui Song <i@maskray.me> | 2022-02-01 10:10:22 -0800 |
|---|---|---|
| committer | Fangrui Song <i@maskray.me> | 2022-02-01 10:10:22 -0800 |
| commit | 0c3704fdbd901e5f51acf11a85278bf9214ae7b2 (patch) | |
| tree | 282687f9e8a3c9fc5d7028b28c628dc15bbbc3f1 /lldb/source/Plugins/ScriptInterpreter/Python | |
| parent | ceb9094a49134d21333150dd876fbb09a165eb3a (diff) | |
| download | llvm-0c3704fdbd901e5f51acf11a85278bf9214ae7b2.zip llvm-0c3704fdbd901e5f51acf11a85278bf9214ae7b2.tar.gz llvm-0c3704fdbd901e5f51acf11a85278bf9214ae7b2.tar.bz2 | |
[ELF] Deduplicate names of local symbols only with -O2
The deduplication requires a DenseMap of the same size of the local part of
.strtab . I optimized it in e20544543478b259eb09fa0a253d4fb1a5525d9e but it is
still quite slow.
For Release build of clang, deduplication makes .strtab 1.1% smaller and makes the link 3% slower.
For chrome, deduplication makes .strtab 0.1% smaller and makes the link 6% slower.
I suggest that we only perform the optimization with -O2 (default is -O1).
Not deduplicating local symbol names will simplify parallel symbol table write.
Reviewed By: peter.smith
Differential Revision: https://reviews.llvm.org/D118577
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python')
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