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assume that if they don't intend to write to a global variable, that they would mark it as constant. However, there are people that don't understand that the compiler can do nice things for them if they give it the information it needs. This pass looks for blatently obvious globals that are only ever read from. Though it uses a trivially simple "alias analysis" of sorts, it is still able to do amazing things to important benchmarks. 253.perlbmk, for example, contains several ***GIANT*** function pointer tables that are not marked constant and should be. Marking them constant allows the optimizer to turn a whole bunch of indirect calls into direct calls. Note that only a link-time optimizer can do this transformation, but perlbmk does have several strings and other minor globals that can be marked constant by this pass when run from GCCAS. 176.gcc has a ton of strings and large tables that are marked constant, both at compile time (38 of them) and at link time (48 more). Other benchmarks give similar results, though it seems like big ones have disproportionally more than small ones. This pass is extremely quick and does good things. I'm going to enable it in gccas & gccld. Not bad for 50 SLOC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11836 91177308-0d34-0410-b5e6-96231b3b80d8 |
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README.txt |
The LLVM Compiler Infrastructure http://llvm.cs.uiuc.edu Welcome to LLVM! ---------------- This file is intended to do four things: (1) help you get started using LLVM; (2) tell you how to get questions about LLVM answered; (3) tell you where to find documentation for different kinds of questions; and (4) tell you about three LLVM-related mailing lists. Getting Started with LLVM ------------------------- (1) For license information: llvm/LICENSE.txt (2) Installing and compiling LLVM: llvm/docs/GettingStarted.html (3) Learn about features and limitations of this release: llvm/docs/ReleaseNotes.html (4) Learn how to write a pass within the LLVM system: llvm/docs/WritingAnLLVMPass.html (5) Learn how to start a new development project using LLVM, where your new source code can live anywhere (outside or inside the LLVM tree), while using LLVM header files and libraries: llvm/docs/Projects.html Getting Help with LLVM ---------------------- (1) If you have questions or development problems not answered in the documentation, send e-mail to llvmdev@cs.uiuc.edu. This mailing list is monitored by all the people in the LLVM group at Illinois, and you should expect prompt first responses. (2) To report a bug, submit a bug report as described in the document: http://llvm.cs.uiuc.edu/docs/HowToSubmitABug.html (3) We now use Bugzilla to track bugs, so you can check the status of previous bugs at: http://llvm.cs.uiuc.edu/bugs/query.cgi LLVM Documentation ------------------ All the documents mentioned below except the design overview tech report are included as part of the LLVM release (in llvm/docs/*): LLVM Design Overview: LLVM : A Compilation Framework for Lifelong Program Analysis and Transformation: http://llvm.cs.uiuc.edu/pubs/2003-09-30-LifelongOptimizationTR.html LLVM User Guides: Download and Installation Instructions: llvm/docs/GettingStarted.html LLVM Command Guide: llvm/docs/CommandGuide/index.html LLVM Assembly Language: llvm/docs/LangRef.html LLVM Test Suite Guide: llvm/docs/TestingGuide.html LLVM Programming Documentation: LLVM Programmers Manual: llvm/docs/ProgrammersManual.html Writing an LLVM Pass: llvm/docs/WritingAnLLVMPass.html Alias Analysis in LLVM: llvm/docs/AliasAnalysis.html Command Line Library: llvm/docs/CommandLine.html Coding Standards: llvm/docs/CodingStandards.html Other LLVM Resources: Submitting a Bug: http://llvm.cs.uiuc.edu/docs/HowToSubmitABug.html Open Projects: llvm/docs/OpenProjects.html Creating a new LLVM Project: llvm/docs/Projects.html Mailing Lists -------------- There are three mailing lists for providing LLVM users with information: (1) LLVM Announcements List: http://mail.cs.uiuc.edu/mailman/listinfo/llvm-announce This is a low volume list that provides important announcements regarding LLVM. It is primarily intended to announce new releases, major updates to the software, etc. This list is highly recommended for anyone that uses LLVM. (2) LLVM Developers List: http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev This list is for people who want to be included in technical discussions of LLVM. People post to this list when they have questions about writing code for or using the LLVM tools. It is relatively low volume. (3) LLVM Commits List http://mail.cs.uiuc.edu/mailman/listinfo/llvm-commits This list contains all commit messages that are made when LLVM developers commit code changes to the CVS archive. It is useful for those who want to stay on the bleeding edge of LLVM development. This list is very high volume.