- linaro-toolchain - lists.linaro.org

[ACTIVITY] 2011-08-19

by David Gilbert

== String routines == * Working through updating my eglibc patch for memchr, I think I'm nearly there - took way too long to persuade an eglibc make check to work cross (can't get native build happy). == QEMU == * Sent a new version of my QEMU patch for the atomic helpers to Peter. * Tested the Android beagle image on a real beagle - it fails in pretty much the same way as the QEMU run. == Other == * Had a brief look at bug 825711 - scribus ftbfs on ARM - this is QT being built to define qreal as float on ARM when it's double on most other things, scribus having a qreal variable and something it's defined as a double and then passing it to a template that requires two arguments of the same type; not really sure which one is to blame here! I'm on holiday next week. Dave

14 years, 8 months

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[ACTIVITY] Aug 15 - Aug 19

by Ulrich Weigand

== GDB == * Created and published Linaro GDB 7.3 2011-08 release. * Analyzed --with-sysroot=remote: testsuite failures, and opened bug LP #829595. * Reviewed Yao's latest Thumb-2 displaced stepping patch. == Schedule == * I'll be on vacation 08/23 through 08/31. 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, 8 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * continued to work on getting libunwind support for remote unwinding upstream * reworked some of the code to address concerns from the ml * now upstream! * made smaller fixes to have another libunwind testcase passing * interfaced with the Linaro Android group to solve an issue where a compile was failing when using -O3 * turned out that the Linaro GCC vectorizes a loop by generating some neon instructions * unfortunately the gas of the 2.20.1 binutils (that is currently used by the Linaro Android toolchain) doesn't properly understand the alignment restrictions of the generated asm code and throws an error * this has be fixed upstream and using a gas from recent binutils fixes the issue * Bernhard is already working on getting newer binutils in their Androuid toolchain build system * continued the work to get libunwind building on Linaro Android * wrote an Android.mk and got an initial libunwind.so built (ugly hacks involved) * next step is modify the debuggerd to make use of libunwind.so Note: Next week I'll be on vacation. Regards Ken

14 years, 8 months

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Looked at LP #823711. Turned out to be a problem with symbol visibility in libgcc.a. Tested a fix that was accepted and applied upstream. Will backport to upstream release branches, so we should be able to pull the fix in that way. * Backported the fix for BZ PR49987 to Linaro 4.6 and 4.5. * Looked at the regrename bug that Ramana reported on gcc@. * Looked at why libav wasn't being vectorised. Discussed with Ira. I think we now have a Plan. * Submitted address writeback scheduling patches upstream. * Submitted and applied some tweaks to the rtx cost interface upstream. * Spent a while trying to figure out what the targetm.rtx_costs API actually is, and how rtx_cost should use it to evaluate the cost of a SET. Discussed on gcc@. * Found that ARM was giving SETs a base cost of 4 instructions. Benchmarked the cost of "fixing" this. It generally seemed positive. * Wrote a couple of other rtx cost patches. == Next week == * Backport fix for #823711 to upstream branches. * Hopefully finish off rtx costs stuff. * Unless there's a clear outcome from the gcc@ discussion, I think I'll abandon my idea of using insn_rtx_cost in the new auto inc/dec patch, and simply sum the cost of every SET. Should be a small change. Richard

14 years, 8 months

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[ACTIVITY] 15th - 19th August

by Asa Sandahl

* Started running EEMBC on Panda. Got three errors in the automotive test at this point. * Started documenting necessary steps for my start-up task: https://wiki.linaro.org/Internal/ToolChain/Benchmarks/First%20time%20notes * Upgraded the Snowball board to the latest version (V3). Created a corresponding test image for Snowball (Linaro 11.06). There is a problem with the serial console freezing after a couple of minutes without any error, not sure if it is a complete crash or just the serial output. The people I have talked to so far has not experienced the same problem. I will set up the networking for the board and see where ssh gets me. Best Regards Åsa

14 years, 8 months

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[ACTIVITY] August 14-18

by Ira Rosen

Hi, - change of default vector size for auto-vectorization on NEON - submitted and approved - continued working on vectorization of widening shifts - looked into SLP vectorization for libav - two vacation days I'll be on vacation on Aug 22-30. Ira

14 years, 8 months

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Basic libav profiling

by Michael Hope

I put a build harness around libav and gathered some profiling data. See: bzr branch lp:~linaro-toolchain-dev/+junk/libav-suite It includes a Makefile that builds a C only, h.264 only decoder and two Creative Commons licensed videos to use as input. README.rst has the basic commands for running ffmpeg and initial perf results showing the hot functions. Dave, 20 % of the time is spent in memcpy() so you might want to have a look. The vectoriser has no effect. GCC 4.5 is ~17 % faster than 4.6. I'll look into extracting and harnessing the functions themselves later this week. -- Michael

14 years, 8 months

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Is the Linaro toolchain useful on x86/x86_64?

by Bernhard Rosenkranzer

Hi, is the Linaro toolchain (esp. gcc) useful on x86/x86_64, or is an attempt to use the Linaro toolchain with such a target just asking for trouble? (No, I'm not secretly an Intel spy ;) Just trying to have some fun with my desktop machine ;) ) ttyl bero

14 years, 8 months

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Linaro GDB 7.3 2011.08 released

by Ulrich Weigand

The Linaro Toolchain Working Group is pleased to announce the release of Linaro GDB 7.3. Linaro GDB 7.3 2011.08 is the first release in the 7.3 series. Based off the latest GDB 7.3, it includes a number of ARM-focused bug fixes. This release includes all bug fixes from the latest Linaro GDB 7.2 release that were not already included in FSF GDB 7.3. In addition, this release fixes: * LP: #804401 [remote testsuite] Thread support * LP: #804387 [remote testsuite] Shared library test problems * LP: #804392 [remote testsuite] Rebuilt executables not copied * LP: #804396 [remote testsuite] Spurious failures The source tarball is available at: https://launchpad.net/gdb-linaro/+milestone/7.3-2011.08 More information on Linaro GDB is available at: https://launchpad.net/gdb-linaro

14 years, 8 months

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Linaro QEMU 2011.08 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2011.08. Linaro QEMU 2011.08 is the latest monthly release of qemu-linaro. Based off upstream (trunk) QEMU, it includes a number of ARM-focused bug fixes and enhancements. This month's release is primarily minor improvements: - Fixes LP:816791: ARMv6 cp15 barrier instructions now work in linux-user mode as well as system mode - Support for ARM1176JZF-S core has been added (thanks to Jamie Iles <jamie(a)jamieiles.com>) - Add workaround for kernel bug LP:727781 (which has resurfaced in 3.0) to suppress warnings about bad-width omap i2c accesses Plus of course new upstream fixes and improvements. Performance: When running qemu in system mode with an SD card image we have determined that performance is best when the image is in writeback caching mode. This significantly increases the performance of the SD card (by factors of 10 or more). An example command line option is: -drive if=sd,cache=writeback,file=my-sd-card.img Note that cache=writeback may result in data not being written to disk if the host system powers down unexpectedly (guest crashes or powerdowns are not a problem). Known issues: - The beagle and beaglexm models still do not support USB networking - There may be some problems with running multithreaded programs in linux-user mode (LP:823902) The source tarball is available at: https://launchpad.net/qemu-linaro/+milestone/2011.08 Binary builds of this qemu-linaro release are being prepared and will be available shortly for users of Ubuntu. Packages will be in the linaro-maintainers tools ppa: https://launchpad.net/~linaro-maintainers/+archive/tools/ More information on Linaro QEMU is available at: https://launchpad.net/qemu-linaro

14 years, 8 months

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Linaro GCC 4.6 and 4.5 2011.08 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2011.08 release of both Linaro GCC 4.6 and Linaro GCC 4.5. Linaro GCC 4.6 2011.08 is the sixth release in the 4.6 series. Based off the latest GCC 4.6.1+svn177703, it focuses on fixing bugs found during the Android integration and in SMS. This is a quiet release due to Linaro Connect. Interesting changes include: * Updates to 4.6.1+r177703 Fixes: * LP: #736007 ICE immed_double_const at emit-rtl.c * LP: #809768 ICE when compiling bionic's libm * LP: #815777 Inconsistent packaging between tarball and root directory names Linaro GCC 4.5 2011.08 is the thirteenth release in the 4.5 series. Based off the latest GCC 4.5.3+svn177552, the release is focused on maintenance. Interesting changes in 4.5 include: * Updates to 4.5.3+r177552 * Now builds for PowerPC Fixes: * LP: #736007 ICE immed_double_const at emit-rtl.c * LP: #809768 ICE when compiling bionic's libm * LP: #815435 ICE: insn does not satisfy its constraints The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.6-2011.08 https://launchpad.net/gcc-linaro/+milestone/4.5-2011.08 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro Mailing list: http://lists.linaro.org/mailman/listinfo/linaro-toolchain Bugs: https://bugs.launchpad.net/gcc-linaro/ Questions? https://ask.linaro.org/ Interested in commercial support? inquire at support(a)linaro.org -- Michael

14 years, 8 months

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Improving libgmp [was: Re: Potential tools team work]

by Michael Hope

On Thu, Aug 18, 2011 at 4:16 AM, Richard Earnshaw <Richard.Earnshaw(a)arm.com> wrote: > I was just browsing libgmp this afternoon and noticed that it really > could do with an overhaul to support recent ARM chips. > > The ARM code seems to have been written for StrongARM; which is now > almost obsolete (for example, it loads from a cache line it is about to > write to in order to pre-allocate the line in the cache). > > It doesn't support v4T interworking. > > It doesn't make any use of v5 or later instructions. > > There is some Thumb(1) code, but again it has no support for > interworking, is pretty poor and limited in scope. > > I'm not sure overall how useful this is to gcc performance; the library > is needed to build GCC, but I think it's mostly there to support libmpfr. > > Nevertheless, there are other apps out there that make use of this > stuff, including some crypto code, IIRC. I looked at using gmp as a benchmark some time ago. The assembly version is twice as fast as the C version already, which is nice. I assume NEON would be a big improvement as well. I had a quick poke through the dependencies in Ubuntu and came up with the following popular packages that use libgmp or libmpfr: * guile * python-crypto * gch (Haskel) * maxima * darcs Nothing earth shattering but probably worthwhile. I've registered: https://blueprints.launchpad.net/linaro-toolchain-misc/+spec/improve-libgmp so that we don't lose it. -- Michael

14 years, 8 months

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Branch is open

by Michael Hope

Hi there. The 2011.08 release has been spun and is testing up well. The 4.5 and 4.6 branches are now open so feel free to commit any approved patches. -- Michael

14 years, 8 months

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

by Ramana Radhakrishnan

> . 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. Sorry about the delayed response. I did notice your mail last week but I was busy with our conference and then the first couple of days this week have just disappeared with some internal training. I would be interested in hearing how you get on with LTO and FDO on ARM. Listening to Honza talking at the GCC unconference in London about the memory usage for full LTO with trunk I did wonder what would happen if we tried it on the ARM target to see what we got, but I never managed to get around to trying anything there :) . We did look at getting FDO working with Linaro GCC last cycle but there are still a couple of issues with PGO in Linaro GCC 4.5. With respect to LTO , the one problem we have currently is that the Neon intrinsics aren't streamed out and streamed back in. So you might have a few issues if your code uses arm_neon.h . https://bugs.launchpad.net/gcc-linaro/+bug/823548 is an example of this problem. This was fixed upstream and we probably just need to backport that into our 4.6 tree. I've tried a backport this morning and I think I have this right finally. If you could do a build and a firefox benchmark run in about 30-60 minutes by all means please do let us know how you get on and what you find. We've been steadily trying to improve the performance of the ARM toolchain and the biggest improvements you'll notice will be with the vectorizer but there will be other small improvements that you'll notice in other general areas of code generation. We would be interested in feedback about what can be done and to add to our queue of things to look at and improve for the ARM port of GCC. With respect to the images, Kiko's probably answered that bit. cheers Ramana

14 years, 8 months

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[ACTIVITY] 8th - 12th August.

by Andrew Stubbs

* GCC Continued tracking down problems in my various broken patches. Fixed one bug, investigated two more. Re-submitted the widening multiplies for testing, and this time it returned with no problems. Yay, I can now check it in next week. Merged from upstream GCC 4.5. The launchpad import bug still exists (although should not for much longer) so I had to ask on #launchpad to get the imports done. Submitted the merged branch for testing. Tried to merge GCC 4.6 similarly, but failed. Bzr just refused to play ball, which was very frustrating. Michael Hope has now done the merge instead. * Other On leave Wednesday and Friday.

14 years, 9 months

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[ACTIVITY] weekly status

by Revital Eres

* libauqntum - running the SMSed version on ARM machine did not show significant improvement. Discussed it with Richard Sandiford. Apparently in the SMS phase the instructions are of DI mode due to the fact the loop contains 64 bit operations while they later been generated as 32 bit operations. This makes SMS less accurate and I'm now looking into a version which disables DI mode operations. * Started to look at the potential of SMS on libav. Initial runs of Richard's microbenchmarks with SMS show some regressions as well as improvements that I'm looking at.

14 years, 9 months

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Standard GCC configurations

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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 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, 9 months

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Using valgrind with linaro toolchain

by Diane Holt

Valgrind wants a less stripped ld-2.12.1.so or it won't work. The build process (that Michael Hope put together) just downloads the libc6_2.12.1-0ubuntu6_armel.deb, and the ld-2.12.1.so in there is fully stripped. I thought I'd be able to just get the libc6-dbg_2.12.1-0ubuntu6_armel.deb instead, thinking that was just the pre-stripped version of these libs -- but apparently it's not, because trying to use those libs instead of the stripped ones results in undefined symbols. For example, ld-2.12.1.so defines _rtld_global -- but libc-2.12.1.so is looking for _rtld_global@@GLIBC_PRIVATE, so _rtld_global@@GLIBC_PRIVATE ends up undefined. (Ditto for __tls_get_addr, __libc_enable_secure, _dl_argv, etc.) I'm not sure who actually builds these packages (they're retrieved from: http://ports.ubuntu.com/pool/main/e/eglibc/), but if anyone has any suggestions on how to get past this, I'd be most appreciative. (I've got angry developers trying to track down memory issues, who about to come after me with torches and pitchforks :P ) Thanks, Diane

14 years, 9 months

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[ACTIVITY] Jul 25 - Jul 29

by Ulrich Weigand

== GDB == * Committed second mainline patch to fix re-built executable remote test problems (#804392). * Prepared for rebasing Linaro GDB on top of GDB 7.3 release. == Misc == * Prepared for Linaro Connect. 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, 9 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * Monday was full of IBM internal meetings * Android * got a self built LEB and generic version 2.3.4 of linaro android running on my pandaboard (build with the gcc 4.6 07 release plus the patch that Richard made) * requires libicui18n.so (external/icu4c/i18n) to be built with -O2 * ran into a few issues (816491, 807230) * libunwind: * simplified the local unwinding (there is no need to touch the ARM exidx table segment when looking it up) * fixed a bug (corner case: the info of the IP to be unwound is described by the last unw entry) * made some progress on the remote unwinding via ptrace * remotely searching the unw withing entry exidx table segment * next step is to remotely extract the unw isns Regards Ken

14 years, 9 months

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[ACTIVITY] report week 30

by Peter Maydell

RAG: Red: Amber: OMAP3 patch upstreaming is slower progress than hoped Green: various outstanding patches accepted upstream in time for 0.15 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 == * omap-gpmc patches now all cleaned up; I think I need to look at qdevifying this device before submitting patches, though * sent patch for bug which makes n810 model crash when key is pressed * sent a pull request collecting together the patches submitted so far == other == * qemu 0.15: put together pull request for ARM patches I think should go into this release; wrote ARM-related bits of the release notes * helped GSoC student track down a bug causing android not to boot * LP:816791: tracking down issues with running mono under qemu (combination of a couple of known qemu bugs and a mono bug) * admin/prep for upcoming travel (cambourne, vancouver, orlando) * reviewing pl041 patches which add audio support to versatilepb and vexpress models * mailing list discussion of possible new qemu object model * lots of meetings this week (toolchain, standup, doughnuts, team comms x2) Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: 1-5 August: Linaro sprint 1111 15-19 August: KVM Forum and LinuxCon NA, Vancouver

14 years, 9 months

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multilib'd (softfp/hardfp) gcc available in Ubuntu oneiric

by Matthias Klose

the current gcc-4.6/eglibc is now built multilib'd for -mfloat-abi=softfp|hard, including the GCC runtime libraries. I hope that the gcc cross builds will pick this up soonish, not needing to build the cross compiler twice for softfp and hard float-abi. Matthias

14 years, 9 months

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[ACTIVITY] 2011-07-29

by David Gilbert

== 64 bit atomics == * Sent updated set of 64bit atomic patches to gcc list with fixes from previous review * Started hunting for other users of 64bit atomics than membase jemalloc, sdl and boost lock free look like possibilities; but I've not looked at them hard yet == QEmu == * Released fix for last SD card block access error - Vincent Palatin released a bunch of SD card fixes a few hours later - that included a fix to the same bug; however it does look like he has a bunch of other stuff we should keep sync'd with. * Changing caching mode to writeback on the block layer fixes bug 732223 (hangs on heavy IO) - goes from 130KB/s to 8MB/s on vexpress - Asked mailing list whether that's reasonable to make as default for SD * Looking at path from CPU->MMC/SD card - the DMA on OMAP is pretty inefficiently emulated, but the soc_dma code has an unused special case for dma'ing to hardware, looks promising but need to figure out how to use it and if it works. * Comparing Vincent's SD card patch with earlier meego patches; partial overlap. == Other == * Pinged libc-ports for comments on my optimised memchr patch * Image testing Next week; I intend to be in Camborne on the afternoon of Monday, Wednesday and Friday. Dave

14 years, 9 months

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[ACTIVITY] July 24-28

by Ira Rosen

Hi, I am checking the coverage of the NEON instructions mostly by writing tests in C to check which instructions are generated (after auto-vectorization) and which are not. I put here https://wiki.linaro.org/IraRosen/Sandbox/InstructionCoverage the list of things that I've checked till now. Ira

14 years, 9 months

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[ACTIVITY] 18th - 22nd July

by Andrew Stubbs

Spun release tarballs for Linaro GCC 4.5 and 4.6. Sent them to Michael Hope and Matthias Klose. Testing for my widening multiplies patches revealed a bug when the accumulate value had a different type. The problem is easily fixed, so I've created a patch, submitted it, and now it's approved upstream. Same again, this time with a bug involving constant integers. Again, easily fixed, submitted, and approved. Nobody had reviewed the first patch in my series - Richard Guenther had reviewed all the others, but wasn't happy to review the expand pass. So, I asked newly crowned RTL Maintainer Richard Sandiford to review it, but apparently it's the wrong bit of the back-end, so I asked Bernd instead. Bernd kindly reviewed and approved it, so now the whole series is ready to commit if only my test comes back clean. Continued trying to figure out why my thumb2 constants patch is broken. So far, no further progress. It might be that Michael's build system is confused, but it's looking likely to be a real bug. ---- Upstream patched requiring review: * NEON scheduling patch http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html

14 years, 9 months

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[ACTIVITY] Weekly status

by Revital Eres

- Opened PR49789 to record the bootstrap failure with SMS flags. - SPEC2006/libquantum: Wrote a hack to apply SMS on the hot loop. Need to make it more accurate. - Pinged SMS patches in mainline. - Looking with Ramana on the effect of the Tree reassociation improvement patch on bwaves http://gcc.gnu.org/ml/gcc-patches/2011-07/msg00904.html

14 years, 9 months

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