Hi Eliot, Thanks for the new version! And here's the first bug report, reproducible :) http://dl.dropbox.com/u/17707726/image.tar.xz Using this image (pharo 1.1.1 from Lukas' hudson with omnibrowser & friends & seaside loaded, pharov10.sources) - opening the settings from the world menu crashes the VM. The output is named 'out1' in the same archive. Regards, Stanislav Paskalev On Fri, Dec 31, 2010 at 4:02 AM, Eliot Miranda <eliot.miranda@gmail.com> wrote:
Hi All, Â Â Â I've released a new version of Cog that has a substantially improved code generator along the lines of Peter Deutsch's HPS (VisualWorks) and various of Ian Piumarta's VMs. Â These all use a simple tecnique to identify constant references in bytecode and to support a register-based calling convention. Â While this does produce faster code it tends to accelerate low-level code much more than high-level code as you can see by the following benchmarks: SimpleStackBasedCogit: [1 to: 100000000 do: [:i|]] timeToRun 691 StackToRegisterMappingCogit: [1 to: 100000000 do: [:i|]] timeToRun 192 192 - 691 / 6.91 -72% SimpleStackBasedCogit: 0 tinyBenchmarks '753495217 bytecodes/sec; 64769127 sends/sec' StackToRegisterMappingCogit: 0 tinyBenchmarks '931756141 bytecodes/sec; 128157989 sends/sec' 931756141 - 753495217 / 7534952.17 -24% 128157989 - 64769127 / 647691.27 -98% SimpleStackBasedCogit: [Compiler recompileAll] timeToRun 47013 (no transcript StackToRegisterMappingCogit: [Compiler recompileAll] timeToRun 43406 (no transcript) 43406 - 47013 / 470.13 -7.67234594686576 The status of this code is essentially beta. Â The test suite runs the same on the new code generator as on the old, but I think there are still bugs because I get the occasional transient error. Â I am therefore very interested in any reproducible errors you can find. The VMs (http://www.mirandabanda.org/files/Cog/VM/VM.r2334/) contain a few other important changes: - a bug fix to bytecode<->native pc mappng that produced incorrect results for methods containing blocks with ^-returns in them. Â One symptom is incorrect highlighting of the pc in the debugger, althoguh symptoms could be much serious. - jitting interpreted methods on backward branches. Â Currently any interpreted method that performs more than 20 backward branches will be considered for JIT compilation and if it is suitable (default, <= 60 literals) will be compiled to native code. - new callback support. Â I need to commit some changes to the Alien package to provide access to this but essentially the VM's callback support is now able to be ported to architectures with register-based calling conventions (ARM, PowerPC, SPARC etc). Â I'll try and get the Alien code released soon, and to back-port the changes to the standard VM before the end of the holiday. One thing that is still /not/ fixed is the lack of a SoundPlugin on win32. Â Apologies. Â I'll try and get a fix for this before the end of the holidays too, but time might be too tight. Â There are other priorities such as harmonising the standard and Cog VMs for the 4.2 release. best Eliot