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73e1a13fdc
Summary: Implements PR889 Removing the virtual table pointer from Value saves 1% of RSS when doing LTO of llc on Linux. The impact on time was positive, but too noisy to conclusively say that performance improved. Here is a link to the spreadsheet with the original data: https://docs.google.com/spreadsheets/d/1F4FHir0qYnV0MEp2sYYp_BuvnJgWlWPhWOwZ6LbW7W4/edit?usp=sharing This change makes it invalid to directly delete a Value, User, or Instruction pointer. Instead, such code can be rewritten to a null check and a call Value::deleteValue(). Value objects tend to have their lifetimes managed through iplist, so for the most part, this isn't a big deal. However, there are some places where LLVM deletes values, and those places had to be migrated to deleteValue. I have also created llvm::unique_value, which has a custom deleter, so it can be used in place of std::unique_ptr<Value>. I had to add the "DerivedUser" Deleter escape hatch for MemorySSA, which derives from User outside of lib/IR. Code in IR cannot include MemorySSA headers or call the MemoryAccess object destructors without introducing a circular dependency, so we need some level of indirection. Unfortunately, no class derived from User may have any virtual methods, because adding a virtual method would break User::getHungOffOperands(), which assumes that it can find the use list immediately prior to the User object. I've added a static_assert to the appropriate OperandTraits templates to help people avoid this trap. Reviewers: chandlerc, mehdi_amini, pete, dberlin, george.burgess.iv Reviewed By: chandlerc Subscribers: krytarowski, eraman, george.burgess.iv, mzolotukhin, Prazek, nlewycky, hans, inglorion, pcc, tejohnson, dberlin, llvm-commits Differential Revision: https://reviews.llvm.org/D31261 llvm-svn: 303362 |
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| .. | ||
| AsmWriterTest.cpp | ||
| AttributesTest.cpp | ||
| CMakeLists.txt | ||
| ConstantRangeTest.cpp | ||
| ConstantsTest.cpp | ||
| DebugInfoTest.cpp | ||
| DebugTypeODRUniquingTest.cpp | ||
| DominatorTreeTest.cpp | ||
| FunctionTest.cpp | ||
| InstructionsTest.cpp | ||
| IntrinsicsTest.cpp | ||
| IRBuilderTest.cpp | ||
| LegacyPassManagerTest.cpp | ||
| MDBuilderTest.cpp | ||
| MetadataTest.cpp | ||
| ModuleTest.cpp | ||
| PassManagerTest.cpp | ||
| PatternMatch.cpp | ||
| TypeBuilderTest.cpp | ||
| TypesTest.cpp | ||
| UserTest.cpp | ||
| UseTest.cpp | ||
| ValueHandleTest.cpp | ||
| ValueMapTest.cpp | ||
| ValueTest.cpp | ||
| VerifierTest.cpp | ||
| WaymarkTest.cpp | ||