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1c1b0ccdd6
We only used to add the edge from the cloned loop to PHIs that corresponded to values defined by the loop. We need to do this for all PHIs obviously since we need a PHI operand for each incoming edge. This includes things like PHIs with a constant value or with values defined before the original loop (see the testcases). After the patch the PHIs are added to the exit block in two passes. In the first pass we ensure there is a single-operand (LCSSA) PHI for each value defined by the loop. In the second pass we loop through each (single-operand) PHI and add the value for the edge from the cloned loop. If the value is defined in the loop we'll use the cloned instruction from the cloned loop. Fixes PR28037 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272649 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.