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Previously, irreducible backedges were ignored. With this commit, irreducible SCCs are discovered on the fly, and modelled as loops with multiple headers. This approximation specifies the headers of irreducible sub-SCCs as its entry blocks and all nodes that are targets of a backedge within it (excluding backedges within true sub-loops). Block frequency calculations act as if we insert a new block that intercepts all the edges to the headers. All backedges and entries to the irreducible SCC point to this imaginary block. This imaginary block has an edge (with even probability) to each header block. The result is now reasonable enough that I've added a number of testcases for irreducible control flow. I've outlined in `BlockFrequencyInfoImpl.h` ways to improve the approximation. <rdar://problem/14292693> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207286 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| include | ||
| lib | ||
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| test | ||
| tools | ||
| unittests | ||
| utils | ||
| .arcconfig | ||
| .clang-format | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| configure | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| llvm.spec.in | ||
| LLVMBuild.txt | ||
| Makefile | ||
| Makefile.common | ||
| Makefile.config.in | ||
| Makefile.rules | ||
| README.txt | ||
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, 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're writing a package for LLVM, see docs/Packaging.rst for our suggestions.