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By using a union for Constant* and ConstantRange we can shave off ptr size bytes off lattice elements. On 64 bit systems, it brings down the size to 40 bytes from 48 bytes. Initialization of Range happens on-demand using placement new, if the state changes to constantrange from non-constantrange. Similarly, the Range object is destroyed if the state changes from constantrange to non-constantrange. Reviewers: reames, anna, davide Reviewed By: reames, davide Differential Revision: https://reviews.llvm.org/D41903 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323049 91177308-0d34-0410-b5e6-96231b3b80d8
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 are writing a package for LLVM, see docs/Packaging.rst for our suggestions.