forked from OSchip/llvm-project
5bd36644c8
As noted in D48987, there are many different ways for this transform to go wrong. In particular, the poison potential for shifts means we have to more careful with those ops. I added tests to make that behavior visible for all of the different cases that I could find. This is a partial fix. To make this review easier, I did not make changes for the single binop pattern (handled in foldSelectShuffleWith1Binop()). I also left out some potential optimizations noted with TODO comments. I'll follow-up once we're confident that things are correct here. The goal is to correct all marked FIXME tests to either avoid the shuffle transform or do it safely. Note that distinguishing when the shuffle mask contains undefs and using getBinOpIdentity() allows for some improvements to div/rem patterns, so there are wins along with the missed opportunities and fixes. Differential Revision: https://reviews.llvm.org/D49047 llvm-svn: 336546 |
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README.txt
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.