Tobias Grosser

is a PhD student in the Parkas Group at ENS/INRIA. Supervised by Albert Cohen he is working on compiler optimizations and automatic parallelisation. Currently he develops an integrated approach for automatic vectorization on heterogeneous architectures.

Interests: Compilers, Optimizations, Polyhedral Model, Vectorization, Accelerators

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Projects

• Polly
  High-Level Optimizer for LLVM
• Graphite
  High-Level Optimizer for GCC
• clang_complete
  C/C++ code completion for vim
• Dr. Cube
  J2ME Rubik's Cube simulator

Contact

Tobias Grosser
École Normale Supérieure,
Département d'Informatique (Parkas)
45 rue d'Ulm
75005 Paris, France

firstname at grosser.es

Publications

Publication List at Google Scholar

Thesis

• Enabling Polyhedral Optimizations in LLVM
  Tobias Grosser
  Diploma Thesis, Universität Passau, Germany, April 2011
  Thesis

Journals

• Polyhedral Optimizations on a Low-Level Intermediate Representation
  Tobias Grosser, Armin Größlinger, Christian Lengauer
  Parallel Processing Letters, 22(4), December 2012, to appear

Presentations

• High-Level Optimizations for Low-Level Compilers
  Tobias Grosser
  Intel, Haifa, November 2012
  Slides
• Polyhedral Optimizations for Low-Level Compilers
  Tobias Grosser
  University of California, Los Angeles, November 2012
  Slides
• LLVM and Polly Tutorial (one day)
  Tobias Grosser
  Indian Institute of Science, Bangalore, July 2012
  Slides
• Polly - First successful optimizations - How to proceed?
  Tobias Grosser, Raghesh A.
  LLVM Developer Meeting 2011, San Jose, USA, November 2011
  Video (mp4, webm), Slides
• Polly - Advanced Optimizations for a Production Compiler
  Tobias Grosser
  ARM Lunch and Learn, Cambridge, UK, September 2011
• Polly - Polyhedral Transformations for LLVM
  Tobias Grosser, Hongbin Zheng
  LLVM Developer Meeting 2010, San Jose, Oktober 2010
  Video (mp4, webm), Slides
• Optimization Opportunities Based on the Polyhedral Model in Graphite.
  Tobias Grosser
  GCC Developers’ Summit, Montréal, Canada, June 2009.
  Paper, Slides
• Design of Graphite and the Polyhedral Compilation Package.
  Jan Sjödin, Sebastian Pop, Harsha Jagasia, Tobias Grosser, and Antoniu Pop
  GCC Developers’ Summit, Montréal, Canada, June 2009.
  Paper, Slides

Workshops

• Polyhedral Extraction Tool
  Sven Verdoolaege, Tobias Grosser
  IMPACT 2012 (at HiPEAC 2012), Paris France, January 2012
  Paper, Slides
• Polly - Polyhedral Optimization in LLVM
  Tobias Grosser, Hongbin Zheng, Raghesh A, Andreas Simbürger, Armin Größlinger, and Louis-Noël Pouchet
  IMPACT 2011 (at CGO 2011), Charmonix France, April 2011
  Paper, Slides
• Graphite Two Years After: First Lessons Learned From Real-World Polyhedral Compilation.
  Konrad Trifunovic, Albert Cohen, David Edelsohn, Li Feng, Tobias Grosser, Harsha Jagasia, Rayza Ladelsky, Sebastian Pop, Jan Sjödin, and Ramakrishna Upadrasta
  2nd International Workshop on GCC Research Opportunities (GROW’10), January 2010.
  Paper, Slides

Teaching

• 888 - LLVM (Ohio State/Spring 2011)
  
  As we work and program directly in this meeting, most of the content is not available on slides. Hence the content that is on the slides might be difficult to understand without visiting the course. If you have questions, please ask back.
  
  
  • Week 6 (InstCombine/Pattern Matching)
    Exercise, Slides
  • Week 5 (Test infrastructure)
    Slides
  • Week 4 (LLVM-IR II)
    Slides
  • Week 3 (Correct exercise)
    Slides
  • Week 2 (LLVM-IR I)
    Slides
  • Week 1 (Introduction/Toolchain)
    Slides

Funding

Current Funding

Google Europe Fellowship in Efficient Computing

Previous Funding

• Google Summer of Code 2012
  As a mentor I supervised:
  for LLVM 'Extending Polly with Automatic GPGPU Code Generation'
• Google Summer of Code 2011
  As a mentor I supervised:
  for LLVM 'Support for Memory Access Optimizations in Polly'
• Google Summer of Code 2010
  As a mentor I supervised:
  for GCC 'Porting Graphite to CLooG'
  for LLVM 'Frontend for the Polyhedral Optimization Framework (Polly)'
• Google Summer of Code 2009
  As a mentor I supervised:
  for GCC 'Automatic Parallelization in Graphite'
• Google Summer of Code 2008
  As a student I worked:
  for GCC on 'Improved GIMPLE to GRAPHITE transformation'

Previous Postions

• ARM Ltd.
  Intern
  Cambridge, UK
• Ohio State University
  Research Scholar
  Columbus, USA
• Advanced Micro Devices, Inc.
  Intern
  Austin, USA
• Universität Passau
  Student Assistant
  Passau, Germany