1. Open64 Release 4.0 High Performance Compiler for Itanium and x86 Linux Shin-Ming Liu, Hewlett Packard
PLDI, June 2007

2. What’s 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 compatible
Industrial Strength
Fortran95 suitable for HPC market
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
2/25/2019

3. Open64 History Derived from SGI MIPSpro compiler suite
MIPSpro compiler incorporates advanced optimizations of 90’s
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
2/25/2019

4. 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
2/25/2019

5. Open64 Active ContributorsHP
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 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
Others…
2/25/2019

6. 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
2/25/2019

7. 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!
2/25/2019

8. Thank you
Meet in the hallway for discussions…
2/25/2019

9. Backup

10. 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
My encouragement to support Pathscale effort
2/25/2019

11. HP Osprey Project 2006 Achievements
Recreated source code repository
Use subversion; hosted on
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
The compiler will be hosted on HP Portal for download
2/25/2019

12. 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
2/25/2019

13. 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
2/25/2019