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Metadata potentially is more precise than any heuristics we use, so it makes sense to use first metadata info if it is available. However it makes sense to examine it against other strong heuristics like unreachable one. If edge coming to unreachable block has higher probability then it is expected by unreachable heuristic then we use heuristic and remaining probability is distributed among other reachable blocks equally. An example where metadata might be more strong then unreachable heuristic is as follows: it is possible that there are two branches and for the branch A metadata says that its probability is (0, 2^25). For the branch B the probability is (1, 2^25). So the expectation is that first edge of B is hotter than first edge of A because first edge of A did not executed at least once. If first edge of A points to the unreachable block then using the unreachable heuristics we'll set the probability for A to (1, 2^20) and now edge of A becomes hotter than edge of B. This is unexpected behavior. This fixed the biggest part of https://bugs.llvm.org/show_bug.cgi?id=32214 Reviewers: sanjoy, junbuml, vsk, chandlerc Reviewed By: chandlerc Subscribers: llvm-commits, reames, davidxl Differential Revision: https://reviews.llvm.org/D30631 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300440 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| llvm.spec.in | ||
| LLVMBuild.txt | ||
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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.