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a6ff22119f
For hung off uses, we need a Use* to tell use where the operands are. This was User::OperandList but we want to remove that to save space of all subclasses which aren't making use of 'hung off uses'. Hung off uses now allocate their own 'OperandList' Use* in the User::new which they call. getOperandList() now uses the hung off uses bit to work out where the Use* for the OperandList lives. If a User has hung off uses, then this bit tells them to go back a single Use* from the User* and use that value as the OperandList. If a User has no hung off uses, then we get the first operand by subtracting (NumOperands * sizeof(Use)) from the User this pointer. This saves a pointer from User and all subclasses. Given the average size of a subclass of User is 112 or 128 bytes, this saves around 7% of space With malloc tending to align to 16-bytes the real saving is typically more like 3.5%. On 'opt -O2 verify-uselistorder.lto.bc', peak memory usage prior to this change is 149MB and after is 143MB so the savings are around 2.5% of peak. Looking at some passes which allocate many Instructions and Values, parseIR drops from 54.25MB to 52.21MB while the Inliner calls to Instruction::clone() drops from 28.20MB to 27.05MB. Reviewed by Duncan Exon Smith. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239623 91177308-0d34-0410-b5e6-96231b3b80d8 |
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Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you're writing a package for LLVM, see docs/Packaging.rst for our suggestions.