forked from OSchip/llvm-project
edf98c5682
SelectionDAG previously missed opportunities to fold constants into GlobalAddresses in several areas. For example, given `(add (add GA, c1), y)`, it would often reassociate to `(add (add GA, y), c1)`, missing the opportunity to create `(add GA+c, y)`. This isn't often visible on targets such as X86 which effectively reassociate adds in their complex address-mode folding logic, however it is currently visible on WebAssembly since it currently has very simple address mode folding code that doesn't reassociate anything. This patch fixes this by making SelectionDAG fold offsets into GlobalAddresses at the same times that it folds constants together, so that it doesn't miss any opportunities to perform such folding. Differential Revision: http://reviews.llvm.org/D16090 llvm-svn: 258296 |
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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 are writing a package for LLVM, see docs/Packaging.rst for our suggestions.