- linaro-toolchain - lists.linaro.org

by Michael Hope

Hi there. I've written up the standard configurations that we use to build and test Linaro GCC: https://wiki.linaro.org/WorkingGroups/ToolChain/Configurations/GCC It includes such things as flags, libraries, and sysroots. You might find it useful to see what we're testing or, if new to compilers, what a good starting point is. -- Michael

14 years, 2 months

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[ACTIVITY] 2011-08-12

by David Gilbert

== QEMU == * Finished off a first cut of the 64bit helper patch to QEMU - Gave it to Peter and have reworked most of the things he commented on * This also lead into a bit of a rabbit hole of finding various generic QEMU threading issues * Tested Peter's 11.08 QEMU release (I used linaro-fetch-image-ui for the first time to grab the release images; quite nice, hit a couple of issues but much nicer than crawling around the site to find where the hwpacks are). == Other == * Pinged gcc patches list for more comments on 64bit atomic patch I'm on holiday the week of 22nd (i.e. the week after next). Dave

14 years, 2 months

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[ACTIVITY] Aug 8 - Aug 12

by Ulrich Weigand

== GDB == * Re-tested Linaro GDB 7.3 on Versatile Express (native & remote testing). * Committed patch to re-enable remote thread test cases (#804401) to mainline and Linaro GDB 7.3. * Reviewed Yao's latest Thumb-2 displaced stepping patch. == GCC == * Patch review week. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

14 years, 2 months

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[ACTIVITY] report week 32

by Peter Maydell

RAG: Red: Amber: OMAP3 patch upstreaming is slower progress than hoped Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || == linaro-qemu-11.11 == * put together release candidate tarball for 2011.08 release, tested * added a workaround for omap kernel bug LP:727781 which had been fixed in 2.6.x but has resurfaced in 3.0 * tarball now ready and only needs releasing next week == 64-bit-sync-primitives == * reviewed David Gilbert's qemu patches to support 64 bit sync primitives == upstream-omap3-patches == * testing/reading Avi's memory API patches to see how they fit in or clash with the qdevification and other omap3 patches == other == * more investigation/thought about LP:823902 -- qemu bug running multithreaded programs in linux-user mode * Manned Linaro demo stand at ARM Partner Meeting (Tue, Wed) * Meetings: GSoC student x2, toolchain, toolchain standup, 1-2-1 Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: 15-19 August: KVM Forum and LinuxCon NA, Vancouver

14 years, 2 months

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[Activity] Week ending 2011-08-12

by Ramana Radhakrishnan

== GCC == === Progress === * Linaro sprint last week - one day of fun with broken laptop. * Looked at how we could get BUILTIN_VECTORIZE_CONVERT work to allow vectorizing some of the floating point conversions. * Fixed PR50022 . Couple of iterations. * Internal training for 2 days. * Dusted off a couple of my old patches and sent them out after testing. * Next to get back to old VFP and ivopts patch. * Looked at a testfailure with -mvectorize-with-neon-quads with Ira . === Plans === * Continue to look at the test failure with mvectorize-with-neon-quad * Finish off optimize_size patch based on comments. * finish off case for handling tbh instrucitons. * Commit fix for PR50022 * Look at some of the issues with VFP moves and try and get forward with it. * Look at BRANCH_COST results. Meetings: * 1-1s * TCWG calls * GNU Toolchain planning meeting. * Some patch review and bugzilla triaging. Absences. * 1st Aug - 5th August - Linaro sprint. * 8th - 9th August - Internal training. * 29th Aug - Sept. 2 - Holiday booked and approved. * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel to be booked.

14 years, 2 months

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Looked a bug report that the fix for LP #736007 had caused regressions on powerpc-darwin. It turned out to be a target-specific bug; the backend has the same const_vector code as i386 and spu, but the fix for PR34856 was never applied there. I'll submit the patch (and backport to Linaro 4.6) once the bug submitter has had a chance to test it. * Experimented with -falign-loops. Found that it triggered a bug in the ARM minipool layout code. Posted patch upstream and committed. Backported to 4.6. * Committed patch to allow globs in define_bypass. * Updated auto inc/dec patch after comments from Bernd and Stephen. I'm pretty happy with it now, but there are a couple of prerequisite patches I need to sort out first. * Started getting those prerequisites ready. * Decided that we needed something a bit more subtle than my original insn_rtx_cost patch: at the moment, we simply don't use rtx costs for lvalues. Wrote a series of patches to "improve" the rtx_cost interface, including providing the outer operand number and an indication of whether the rtx is an lvalue or an rvalue. * Upgraded my laptop. This turnted out to be more eventful than anticipated, and ended up taking a whole day. == Next week == * Post auto inc/dec preparatory patches for review. Hopefully post an RFA for the pass itself. Richard

14 years, 2 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * worked on getting the remote unwind support for ARM upstream * noticed when building a recent android image of the linaro_android_2.3.4 branch for the panda the init.rc attempts to mount wrong partitions * tracked down the commit and opened a bug * linaro android team fixed it real quick * started to integrate libunwind into Andriod * two issues here: - the build system requires an Android.mk (while libunwind is autoconf+libtool based) - libunwind uses some interfaces/headers that are not provided by the bionlic libc Regards Ken

14 years, 2 months

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Re: What are the chances of a phone based developer image

by Christian Robottom Reis

On Thu, Aug 04, 2011 at 12:03:00PM -0700, Taras Glek wrote: > Recently we have been looking at how to squeeze more performance out > of our toolchain for building Firefox on Android. Mike Hommey > integrated GCC 4.6 into the android NDK and has been testing > performance (with mixed results > http://gcc.gnu.org/ml/gcc/2011-08/msg00096.html). You should definitely be trying to build using the Linaro 4.5 and 4.6 compiler branches; they are pretty much guaranteed to give you better performance, and if they don't, we're on the hook to fix it quickly! All the patches go upstream, so there is no risk of you being stuck on a fork -- it just makes everything you need available right now. I'm copying the linaro-toolchain list to make sure that you get the right people's attention (though if they weren't all coming back from Connect in Cambridge this week they would have picked the email up already). > I like how Linaro is doing regular arm benchmarking, ie > https://wiki.linaro.org/Platform/Android/AndroidToolchainBenchmarking/2011-… We do much more than that, but it's not as easy to find right now; for instance http://ex.seabright.co.nz/helpers/benchcompare is Michael's regular release benchmark. > . Would you be interested in adding a Firefox-based benchmark? As a > large application it is a good testbed for LTO, FDO and other > aggressive optimizations. Totally. Let's do it. Can you give me an idea of what boards you are testing the build on today? Do you have a test suite that we could run in a reasonable timeframe (hours, not days)? > We are also looking at setting a developer-friendly android ROM with > oprofile, perf, systemtap, gdb, debug symbols, etc. It might even be > beneficial for us to use newer kernels as we exlore options like > kernel-assisted ld.so relocations, etc. That seems to similar to > what Linaro provides in the evaluation ROMS. Is there any chance of > Linaro providing developer-friendly "evaluation" ROMs for retail > phones like the Nexus S? It's indeed pretty similar (we just call them LEBs), and Zach will be really interested in working with you on this. As for supporting actual released phones, it lies somewhat outside of our optimal operating model, and we don't have any hardware available. I guess we could do a spin for a specific model if we had enough of them to use by a set of engineers in the different teams. They are so expensive, though. Do you guys have lots of them? -- Christian Robottom Reis, Engineering VP Brazil (GMT-3) | [+55] 16 9112 6430 | [+1] 612 216 4935 Linaro.org: Open Source Software for ARM SoCs

14 years, 2 months

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Change in Linaro Toolchain naming

by Michael Hope

Hi there. This is a heads-up that the name of the Toolchain group releases will change slightly with next weeks release. We're dropping the respin suffix (the -0) to line up with the new whole of Linaro naming convention. What was: gcc-linaro-4.6-2011.xx-0.tar.bz2 gdb-linaro-7.2-2011.xx-0.tar.bz2 qemu-linaro-0.15-2011.xx-0.tar.bz2 will now be: gcc-linaro-4.6-2011.xx.tar.bz2 gdb-linaro-7.2-2011.xx.tar.bz2 qemu-linaro-0.15-2011.xx.tar.bz2 Earth shattering, eh? I've taken the opportunity to write up our naming convention at the same time: https://wiki.linaro.org/WorkingGroups/ToolChain/Naming -- Michael

14 years, 2 months

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Re: RFC: Saving and restoring the assembler state during assembly

by Richard Sandiford

Dave Martin <dave.martin(a)linaro.org> writes: > However, there's not really anything fundamentally > architecture-specific about this problem, and ideally the solution and > the directives should not be architecture-specific either. > One option which appeals to me is to have some directives which can > exist across all architectures, and do something analogous to what > .set push and ,set pop do on MIPS. FWIW, this sounds like a really good idea to me. I won't argue about the syntax (I have no particular preference). > I feel that the environment should also include global, > target-independent state such as the current macro mode (.altmacro > versus .noaltmacro) and current ELF section stack state, but not > symbols or macro definitions themselves. Sounds reasonable. To state the obvious, we'd have to make the existing target-dependent groupings (like .set push/pop on MIPS) work with this new scheme, but those directives musn't affect this extra target-independent information. So the new directives would interact with both the traditional .pushsection and the traditional target-dependent directives, even though those two features would otherwise remain independent. That is, .pushsection and .set push/pop operate on conceptually separate stacks whoses pushes and pops can be freely mixed. But .pushsection and the new directives would need to be strictly stacked; pops must have the same form as their corresponding pushes. Combinations of .set push/pop and the new directives would also need to be strictly stacked. Nothing a bit of code can't handle though. Richard

14 years, 2 months

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RFC: Saving and restoring the assembler state during assembly

by Dave Martin

Hi all, On ARM, we've now hit the problem a few times of temporarily overriding the assembler state (or rather, not being able to do this reliably). For example, sometimes there's a need to assemble a few instructions for a different architecture version so we can optionally execute or skip them at run-time is not really possible at present. This sort of feature is especially useful in macros but can be useful elsewhere too. There seem to be some target-specific solutions to this problem already. MIPS has its "option stack", maintained by .set push and .set pop directives. From the documentation, it sounds like this saves/restores a somewhat comprehensive set of state, but doesn't make much syntactic sense on arches which use .set to define symbols (i.e., most arches). PowerPC also has .machine push and .machine pop, but those only act on one specific aspect of the assembler state, and therefore aren't as portable a concept. However, there's not really anything fundamentally architecture-specific about this problem, and ideally the solution and the directives should not be architecture-specific either. One option which appeals to me is to have some directives which can exist across all architectures, and do something analogous to what .set push and ,set pop do on MIPS. My names would be .pushenv and .popenv, but obviously, they can be named any way people like. (For now I'm stealing groff's "environment" terminology to refer to such saved and restored state -- hence "env". Again, the nomenclature is arbitrary.) These directives would save and restore a target-specific set of state, which the philosophy that anything that can reasonably be changed with a directive mid-file can also be saved and restored with .pushenv/.popenv. Effectively, .popenv would be equivalent to issuing the necessary set of assembler directives to restore the assembler state to whatever it was at the last .pushenv (including the state of the environment stack itself) I feel that the environment should also include global, target-independent state such as the current macro mode (.altmacro versus .noaltmacro) and current ELF section stack state, but not symbols or macro definitions themselves. Currently, neither the macro mode nor the behaviour of .previous is reliably restorable after being changed (unless I missed something). This can result in unexpected behaviour after a macro which switches sections or changes the macro mode. This seems unfortunate since on most arches there is no syntactic difference between a machine instruction and a macro invocation -- hence in the presence of macros, the only time you're really 100% certain what .previous will do is immediately after a .pushsection or .section directive (which obviously is not much use). Comments are welcome -- at the moment this is just a fuzzy idea for a feature which might prove useful. I haven't investigated the implementation implications -- maybe it could be built straightforwardly around the current MIPS directives. Cheers ---Dave

14 years, 2 months

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[ACTIVITY] August 7-11

by Ira Rosen

Hi, * fixed PR 50014 and 50039 - to be backported to linaro-gcc * tested the patch to change the default vector size on NEON * found one test that fails with quad-words - gcc.c-torture/execute/mode-dependent-address.c. Debugging it with Ramana. * started looking into widening shifts Vacation plans: next week Monday and Wednesday and August 22 - 30. Ira

14 years, 2 months

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ld in current (4.6-2011.07-0-8-2011-07-25_12-42-06) toolchain fails to link uboot

by Bernhard Rosenkranzer

Hi, ld in the current (4.6-2011.07-0-8-2011-07-25_12-42-06) Android toolchain fails to link uboot: arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/libgeneric.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/crc16.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/libgeneric.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/crc32.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ctype.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ctype.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/div64.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/div64.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/errno.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/errno.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ldiv.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ldiv.o I believe this is already fixed in upstream binutils (or at least in hjl's 2.21.52.0.2 release from kernel.org /pub/linux/devel/binutils). ttyl bero

14 years, 2 months

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tomorrow's call cancelled.

by Ramana Radhakrishnan

Given I'm away at some internal training and we had one last week . I decided to cancel this. Ramana

14 years, 2 months

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[ACTIVITY] report week 31

by Peter Maydell

RAG: Red: Amber: OMAP3 patch upstreaming is slower progress than hoped Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || == upstream-omap3-patches == * discussion with upstream about how best to model omap-gpmc as qdev == other == * Attended Linaro Connect Q3.11 * submitted some patches which fix minor bugs that were preventing the QEMU M3 model from booting the Keil example binary images * miscellaneous upstream patch review Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: 9, 10 August: manning Linaro demo stand at APM 15-19 August: KVM Forum and LinuxCon NA, Vancouver

14 years, 2 months

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[ACTIVITY] Weekly status

by Richard Sandiford

== Last week (Linaro Connect) == * Reran libav comparisons after Ira's fix for excessive promotion. The vectorized versions are now at least as good as the non-vectorised ones. Updated wiki page with new asm output and microbenchmark results. * More work on SMS. I have some patches that wire up the ddg code to IV analysis. It gave some nice benchmark improvements, but also some regressions. Traced the regressions down to cases where the schedule for small iis generated too many moves. E.g. in a small microbenchmark, we were able to schedule 6 instructions with an ii of 3 (i.e. in a loop iteration of 3 cycles), but then needed to add ~9 moves in order to keep the dependencies correct. We got much better code with a larger ii and fewer moves. Wrote a patch to estimate how many moves would be added, and to try to a larger ii if the number of moves is too high. This improved the results for one benchmark independently of the iv patch, and had no effect on the others. Discussed this with Revital, who said that Mustafa had tried a similar thing but seen no benefit. * Got powerpc-ibm-aix5.3 bootstraps working. Needs a few local fixes due to C++ bootstrapping. Used it to test a couple of preparatory patches for the IV work. Submitted those patches upstream. * Ran benchmarks with -fno-schedule-insns after seeing that the first scheduling pass was responsible for the main NEON-vs.-non-NEON regression in EEMBC. It fixed that case, but as expected, made others worse. Mentioned this to Ramana, who pointed me at -fsched-pressure. Reran the benchmarks with -fsched-pressure instead of -fno-schedule-insns. It too fixed the main regression, and improved a couple of other tests too. It showed a regression in another test though. Looked at that regression. It was a case where many registers were live across a loop, but not used in it. This was causing the loop to have a very conservative schedule. It would be better to spill some of the other registers instead. Wrote a patch to take loops into account, and it seemed to do the right thing for EEMBC. Sent it to Andreas, after Ulrich mentioned that he had been looking at -fsched-pressure problems on s390. Andreas is away for a while, though, so I might put this on the back burner until he gets back. == This week == * SMS * auto inc/dec * libav, perhaps Richard

14 years, 2 months

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[ACTIVITY] Aug 1-5

by Ira Rosen

Hi, * committed upstream a patch that reduces over-promotion of vector operations * started to work on a new version of the patch to change the default vector size for Neon * attended Linaro connect Ira

14 years, 2 months

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[ACTIVITY] Weekly status

by Revital Eres

* Committed a set of SMS patches to trunk and gcc-linaro branch. * Implemented a hack to evaluate the potential of SMS on SPEC2006/libqauntum. * involved in non linaro issue

14 years, 2 months

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[ACTIVITY] 2011-08-05

by David Gilbert

== QEMU == * After discussion with Peter started writing QEMU fixup for 64bit atomic helper version location. * Sent fixes for soc-dma code to qemu list * Trying to understand just how much of omap_dma's code is needed. == Other == * Travelling to/from connect * Wanted to dial into some of the seessions in Corpus and Magdelen rooms but the remote audio from them was unusable. Dave

14 years, 2 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, Libunwind: * finished initial ARM support for remote unwinding (libunwind-ptrace) Android: * took a closer look at the debuggerd * got the perflab benchmark running on my PandaBoard using Linaro GCC Misc: * remotely attended some Linaro Connect Android sessions Regards Ken

14 years, 2 months

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[ACTIVITY] Aug 1 - Aug 5

by Ulrich Weigand

== GDB == * Created Linaro GDB 7.3 branch * Ported all remaining feature patches from Linaro GDB 7.2 * Backported mainline patches to fix remote test issues: - Fixed #804387 Shared library test problems - Fixed #804392 Rebuilt executables not copied - Fixed #804396 Spurious failures * Committed mainline patch to fix dlopen test cases for remote testing (#804387). * Committed mainline patches to fix misc. other remote test problems (#804396). == Misc == * Attended Linaro Connect in Cambourne. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

14 years, 2 months

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libav wiki page updated for current FSF trunk

by Richard Sandiford

I've updated: https://wiki.linaro.org/RichardSandiford/Sandbox/NeonLibAv so that it gives the output for current trunk, including Ira's commit yesterday to reduce the amount of overpromotion. I also reran the microbenchmarks. The good news is that the vectorised code is now better in all cases than the non-vectorised code. The biggest winner from last time was rgb24tobgr16_C(). It used to be much worse with vectorisation due to lots of excessive widening. Thanks to Ira's patch, the loop now looks pretty respectable, and is ~3.25x faster than the non-vectorised code. As well as using a more recent compiler, the new version also uses -mvectorize-with-neon-quad. Once again it shows a significant improvement over the default. Richard

14 years, 2 months

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QEMU futures

by Michael Hope

Hi there. We had a brainstorm this afternoon about areas QEMU could go into in the future. My pigeon-scratchings are at: https://wiki.linaro.org/WorkingGroups/ToolChain/Q3.11/QEMUFutures See also: https://wiki.linaro.org/MichaelHope/Sandbox/RoadmapIdeas#QEMU_everywhere -- Michael

14 years, 2 months

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[ACTIVITY] 25th - 31st July

by Andrew Stubbs

Continued work on widening multiplied. I've identified another cause for the bootstrap failure, and submitted the new version for testing. Continued trying to find out how my thumb2 constants patches are broken. This is taking ages due to the time it takes to turn around a bootstrap build on my IGEP board. Tried to get the CS Panda boards to work again. They'll do the bootstrap builds much faster (if still not quickly), but are no longer very well. All my attempts to bring them back up remotely have failed. I've discovered that the device the serial console on one was connected to has been relocated to the new Mentor Graphics board lab, so this might explain some of it .... Chaired the Monday and Thursday meetings in Michael's absence. Travelled to the Linaro Connect event in Cambourne, near Cambridge. Other: More machine trouble. I keep thinking I have the display issues solved, and then it starts up with all the windows displayed double sized, but requiring mouse clicks in the correct location .... typically this happened just when I needed access to the pin number for the Monday meeting. This hasn't happened since Monday, so hopefully it's now ironed out ... this sort of thing does not happen with Windows. :( ---- Upstream patched requiring review: * NEON scheduling patch http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html

14 years, 2 months

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[ACTIVITY] Weekly status

by Revital Eres

* Looking into SMS patches sent to mainline which expands SMS functionally to avoid using doloop. The patches resolve the recent bootstrap failure on mainline. http://gcc.gnu.org/ml/gcc-patches/2011-07/msg01807.html * Continue looking into 462.libquantum.

14 years, 2 months

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