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ClangBuildAnalyzer results show that a lot of time is spent instantiating AnalysisManager::getResultImpl across the code base: **** Templates that took longest to instantiate: 50445 ms: llvm::AnalysisManager<llvm::Function>::getResultImpl (412 times, avg 122 ms) 47797 ms: llvm::AnalysisManager<llvm::Function>::getResult<llvm::TargetLibraryAnalysis> (389 times, avg 122 ms) 46894 ms: std::tie<const unsigned long long, const bool> (2452 times, avg 19 ms) 43851 ms: llvm::BumpPtrAllocatorImpl<llvm::MallocAllocator, 4096, 4096>::Allocate (3228 times, avg 13 ms) 33911 ms: std::tie<const unsigned int, const unsigned int, const unsigned int, const unsigned int> (897 times, avg 37 ms) 33854 ms: std::tie<const unsigned long long, const unsigned long long> (1897 times, avg 17 ms) 27886 ms: std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string (11156 times, avg 2 ms) I mentioned this result to @chandlerc, and he suggested this direction. AnalysisManager is already explicitly instantiated, and getResultImpl doesn't need to be inlined. Move the definition to an Impl header, and include that header in files that explicitly instantiate AnalysisManager. There are only four (real) IR units: - function - module - loop - cgscc Looking at a specific transform (ArgumentPromotion.cpp), here are three compilations before & after this change: BEFORE: $ for i in $(seq 3) ; do ./ccit.bat ; done peak memory: 258.15MB real: 0m6.297s peak memory: 257.54MB real: 0m5.906s peak memory: 257.47MB real: 0m6.219s AFTER: $ for i in $(seq 3) ; do ./ccit.bat ; done peak memory: 235.35MB real: 0m5.454s peak memory: 234.72MB real: 0m5.235s peak memory: 234.39MB real: 0m5.469s The 20MB of memory saved seems real, and the time improvement seems like it is there. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D73817 |
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| ADT | ||
| Analysis | ||
| AsmParser | ||
| BinaryFormat | ||
| Bitcode | ||
| Bitstream | ||
| CodeGen | ||
| DebugInfo | ||
| Demangle | ||
| ExecutionEngine | ||
| Frontend | ||
| FuzzMutate | ||
| IR | ||
| LineEditor | ||
| Linker | ||
| MC | ||
| MI | ||
| Object | ||
| ObjectYAML | ||
| Option | ||
| Passes | ||
| ProfileData | ||
| Remarks | ||
| Support | ||
| TableGen | ||
| Target | ||
| TextAPI | ||
| tools | ||
| Transforms | ||
| XRay | ||
| CMakeLists.txt | ||
| unittest.cfg.in | ||