7b83a1438f
The initial version was reverted because it looped infinitely if the likely successor isn't properly dominated by the predecessor. In practice it means that we went up the CFG through backedge and looped infinitely. I also added some paranoid assertion checks to make sure that every other invariant holds. I also found a hypothetical situation when we may go past the dominated block while following the likely successors (it means that in fact the dominated block is dynamically not reachable from dominating block) and explicitly prohibited this, though I don't have a motivating test showing that it's a real problem. https://reviews.llvm.org/D146276 |
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The LLVM Compiler Infrastructure ================================ 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.