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0-7: Address 8-11: Line 12-13: Column 14-15: File 16-19: Isa 20-23: Discriminator 24+: bit fields The packing is fine until the "Isa" field, which is an 8-bit int that occupies 4 bytes. We can instead move Discriminator into the 16-19 slot, and pack Isa into the 20-23 range along with the bit fields: 0-7: Address 8-11: Line 12-13: Column 14-15: File 16-19: Discriminator 20-23: Isa + bit fields This layout is only 24 bytes. This 25% reduction in size may seem small but a large binary can have line tables with thousands of rows stored in a vector. Patch by Simon Que! Differential Revision: https://reviews.llvm.org/D27961 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290931 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.