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Turning (op x (mul y k)) into (op x (lsl (mul y k>>n) n)) is beneficial when we can do the lsl as a shifted operand and the resulting multiply constant is simpler to generate. Do this by doing the transformation when trying to select a shifted operand, as that ensures that it actually turns out better (the alternative would be to do it in PreprocessISelDAG, but we don't know for sure there if extracting the shift would allow a shifted operand to be used). Differential Revision: http://reviews.llvm.org/D12196 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247569 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| tools | ||
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| configure | ||
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| LICENSE.TXT | ||
| llvm.spec.in | ||
| LLVMBuild.txt | ||
| Makefile | ||
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| 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're writing a package for LLVM, see docs/Packaging.rst for our suggestions.