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c5266b5293
This is a fairly straightforward port to the new pass manager with one exception. It removes a very questionable use of releaseMemory() in the old pass to invalidate its caches between runs on a function. I don't think this is really guaranteed to be safe. I've just used the more direct port to the new PM to address this by nuking the results object each time the pass runs. While this could cause some minor malloc traffic increase, I don't expect the compile time performance hit to be noticable, and it makes the correctness and other aspects of the pass much easier to reason about. In some cases, it may make things faster by making the sets and maps smaller with better locality. Indeed, the measurements collected by Bruno (thanks!!!) show mostly compile time improvements. There is sadly very limited testing at this point as there are only two tests of memdep, and both rely on GVN. I'll be porting GVN next and that will exercise this heavily though. Differential Revision: http://reviews.llvm.org/D17962 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263082 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 are writing a package for LLVM, see docs/Packaging.rst for our suggestions.