Open64 Release 4'0 High Performance Compiler for Itanium and x86 Linux ShinMing Liu, Hewlett Packard

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Open64 Release 4.0High Performance Compiler for
Itanium and x86 LinuxShin-Ming Liu, Hewlett
Packard
PLDI, June 2007
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Whats the News

• Open64 version 4.0 is released for compiler
  research
• Supports Itanium and x86 family on Linux
• Three languages C, C, Fortran95
• GCC/G 4.0 compatible
• Industrial Strength
• Fortran95 suitable for HPC market
• www.open64.net hosts SVN, Bugzilla, Release,
  Documentation
• For cooperative development model for best
  leverage
• Downloadable binary and source packages
• Open64 Steering Group to coordinate open64
  architectural evolution
• Members from Industry and Universities

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Open64 History

• Derived from SGI MIPSpro compiler suite
• MIPSpro compiler incorporates advanced
  optimizations of 90s
• Interprocedural Analysis, rooted from Rice
  University
• Loop Nest Optimizer, a production version of
  Stanford SUIF
• Global Optimizer, rooted from Stanford/MIPS,
  invented SSAPRE
• Code Generator, rooted from Cydra5 and Multiflow
  technology
• SGI did the initial port to Itanium
• SGI open sourced the MIPSpro compilers in Summer
  2000 as the Pro64 compiler suite
• Gnu-front-end based C, C compilers
• Cray-FORTRAN front-end based F95 compiler

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Open64 History

• University of Delaware took over maintenance of
  Pro64 compiler suite
• New distribution re-named to be Open64 compiler
  suite
• Retargeted to several machines
• Mips, IA64, X86-64, Ceva, Tensilica, XScale
  (ARM),
• Intel enhanced the Open64 compiler code generator
  with advanced optimizations for Itanium
• Itanium-enhanced Open64 compiler suite released
  as the Open Research Compiler (ORC) to
  facilitate Itanium-related research efforts in
  academia
• Pathscale retargeted Open64 compilers for x86-64
  and EMT-64

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Open64 Active Contributors

• HP
• Initiated Osprey Project since Nov. 2005,
• to productize open64 for Itanium/Linux,
• to address the need for high performance
  production quality open source compiler
• Merge various branches (x86, ORC), follow gcc
  evolution
• Qlogic (aka Pathscale)
• Retargeted for x86 family, updated GCC/G front
  end, polished the production quality for
  x86/Linux
• Google
• Initiated Go64 project in 2007, to develop
  performance advisory feature
• University of Delaware
• Hosts www.open64.net for source tree repository,
  etc.
• Active contributor in HP Osprey Project
• Tsinghua University
• Participates in HP Osprey Project
• Initiated the Retargetability Project, to enable
  a new architecture port in a week
• China Academy of Science
• Participates in HP Osprey Project
• Others

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Open64 is for YOU

• Compiler research for multi-core era
• Highly scalable Interprocedural Optimization
  Framework
• Loop Nest Optimization with automatic
  parallelization
• Global Optimization and Code Generator tuned for
  EPIC, RISC, and CISC
• Compiler for new SOC in your mind
• Simple to Retarget
• Compiler for GPU and Hardware Accelerators
• Framework for Static Analysis Tool
• IPA framework enables accurate diagnostics
• Framework for Run Time Security Check
• Can use advanced optimizations to minimize
  overhead

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Call for Participation

• All dimensions of Multi-core / Multi-thread
• Break the Memory Hierarchy Barrier
• Better Integration with Java and C
• Mix-mode programming paradigm
• Trade-off between Static and Dynamic Compilation
  model
• Debugging and Performance Analysis/Advisory Tools
• Productivity and Security Check Tools
• Scalable/Incremental Inter Procedural Analysis
  Framework for Huge Applications
• Instruction Level Parallelism
• Is it all done? Clearly Not!

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Thank you

• Meet in the hallway for discussions

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• Backup

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Contributions from Pathscale (Qlogic)

• Osprey Project leverages effort made by Pathscale
  heavily
• Pathscale contributions (a Partial List)
• Brought up x8664 target support to Open64
• Option level compatibility with GCC/G
• Upgraded the GNU 3.x and GNU 4.x front end
• Added support for C Exception Handling in
  bridge
• Introduced new abstraction between GNU front end
  and Open64 framework
• Fixed many bugs in the front end /back end bridge
• Improved quality of middle end optimizations
• Updated Fortran front-end to support 2003
  standard
• Updated IPA linker to binutils-2.16.1
• My encouragement to support Pathscale effort

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HP Osprey Project 2006 Achievements

• Recreated source code repository
• Use subversion hosted on http//www.open64.net
• Includes all Open64 past releases in kept in
  Sourceforge
• Incorporated changes made in Pathscale
• Form extended engineering team, by engaging key
  academic and research institutions
• Released Opencc 3.0
• Adopted Pathscale 2.1 tree for GCC3.x front-end
  updates
• Incorporate latest ORC Itanium Code Generator
• Implement IA64 C ABI compatibility
• Ensure gcc command option compatibility
• Booted Linux Kernel with few source work-arounds

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HP Osprey Project 2007 Goals

• Merge Pathscale 3.0 changes
• Catch up with GCC4.2 front ends
• Full GCC ABI compatibility
• New Inter Procedural Analysis/Optimizations
• Memory Hierarchy Optimizations
• New Itanium Specific Optimizations
• Advanced Prefetch
• Exploit Multi-core Trend
• Loop Parallelization, Automatic or Program Advise
• Thread Level Parallelization

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Open64 Research Activities

• UPC UC Berkeley
• OpenMP Tools U of Houston
• EPS, a global scheduler SNU
• Static analysis / performance advisory Google
• Cyclops University of Delaware
• Speculative Parallel Threading UMN