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With subregister liveness enabled we can detect the case where only parts of a register are live in, this is expressed as a 32bit lanemask. The current code only keeps registers in the live-in list and therefore enumerated all subregisters affected by the lanemask. This turned out to be too conservative as the subregister may also cover additional parts of the lanemask which are not live. Expressing a given lanemask by enumerating a minimum set of subregisters is computationally expensive so the best solution is to simply change the live-in list to store the lanemasks as well. This will reduce memory usage for targets using subregister liveness and slightly increase it for other targets Differential Revision: http://reviews.llvm.org/D12442 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247171 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.