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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 llvm-svn: 323049
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.