forked from OSchip/llvm-project
bdb9430917
Summary: We are incorrectly updating the LI when loop-simplify generates dedicated exit blocks for a loop. The issue is that there's an implicit assumption that the Preds passed into UpdateAnalysisInformation are reachable. However, this is not true and breaks LI by incorrectly updating the header of a loop. One such case is when we generate dedicated exits when the exit block is a landing pad (through SplitLandingPadPredecessors). There maybe other cases as well, since we do not guarantee that Preds passed in are reachable basic blocks. The added test case shows how loop-simplify breaks LI for the outer loop (and DT in turn) after we try to generate the LoopSimplifyForm. Reviewers: davide, chandlerc, sanjoy Reviewed By: davide Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D41519 llvm-svn: 321653 |
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| llvm.spec.in | ||
README.txt
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.