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For an instruction in the basic block BB, SinkingPass enumerates basic blocks dominated by BB and BB's successors. For each enumerated basic block, SinkingPass uses `AllUsesDominatedByBlock` to check whether the basic block dominates all of the instruction's users. This is inefficient. Use the nearest common dominator of all users to avoid enumerating the candidate. The nearest common dominator may be in a parent loop which is not beneficial. In that case, find the ancestors in the dominator tree. In the case that the instruction has no user, with this change we will not perform unnecessary move. This causes some amdgpu test changes. A stage-2 x86-64 clang is a byte identical with this change. |
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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.