- linaro-toolchain - lists.linaro.org

by Revital Eres

Testing the SMS register pressure estimation on libav micro benchmarks and eembc. Discussed with Ayal the implementation. He had some ideas to consider regarding the it. Looking into the regressions of SMSed kernels in libav which are not related to register pressure: Consulting with Ayal regarding the case in dsputil-ssd_int8_vs_int16_c where we have severe regression with SMS; it seemed that the regression was due to dependence between accumulations that can be avoided, more specifically we had the following case in vector code: vec1 = vec1 + ... ... vec1 = vec1+ ... ... vec1 = vec1+ ... ... vec1 = vec1+... to resolve this, I implemented a hack similar to MVE optimiation in the loop-unroller as follows: vec1 = vec1 + ... ... vec2 = vec2+ ... ... vec3 = vec3+ ... ... vec4 = vec4+... This gives ~4.5% improvements to the non-SMSed version. The SMS version now shows no regression as the problematic loop which caused the regression now failed to be SMSed and I'm looking into the reason. Another regression showed in idct-internal-8 is apparently related to the do-loop optimziation (SMS actually failed to be applied in this loop). when applying the patch to expand SMS to recognise doloop then the regression is resolved. (http://gcc.gnu.org/ml/gcc-patches/2011-09/msg02051.html; patch is not in mainline yet)

14 years, 1 month

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WW45

by Zhenqiang Chen

Summary: * Add expat and ncurses support for gdb-cross. * Rebase and create patches for crosstool-ng upstream. * Compare configurations difference between crosstool-ng and embedded toolchain. Details: * Add expat and ncurses support for gdb cross. At this time, all the packages can be built for both Linux and Mingw32 host with baremetal target. * Rebase and create patches for crosstool-ng upstream. Patches are sent to Michael for review. * Compare configurations difference between crosstool-ng and embedded toolchain. To align the configuration, crosstool-ng * need (not necessary) --disable-nls for companion libs. * need make document. * need add --enable-newlib-register-fini config and enhance CFLAGS_FOR_TARGET for newlib. * need --disable-sim for gdb. * need multilib support (Can workaround for current implementation. Need improvement when it is fully supported). Thanks! -Zhenqiang

14 years, 1 month

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[ACTIVITY] 2011-11-11

by David Gilbert

== 64 bit atomics == * Nailed one more of the membase tests; again this was a test harness race condition (which I've reported here: http://code.google.com/p/moxi/issues/detail?id=2&thanks=2&ts=1321037460 ) In this case there were two calls to write) performed on the server, yet the test client performed a single read and compared the result to what it was expecting; and got lucky on x86 and about half the time on ARM in that the server data managed to all get read by the 1st read. I think this leaves one more case - that I've seen rarely. == Qemu == * Tested Peter's 11.11 pre release; ran into a couple of issues (vexpress without sound causing hangs, and the Linaro 11.10 Beagle and Overo images not running X). Also filed a couple of bugs in l-i-f-ui that I tripped over while testing it. == String routines == * The new newlib A15 optimised memcpy is slower on an A9 than my routines; posted to newlib list asking what the normal way of dealing with a bunch of different routines is. Would it make sense to get gcc to define a GCC_ARM_TUNE_CORTEX_A-whatever ? == Other == * Watched the Youtube video of the Kernel/Toolchain discussion - for those who didn't attend, I'd encourage a check of the Youtube videos, they're pretty nicely done. * Got pulled away on non-Linaro work for about half the week. Dave

14 years, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, Android: * managed to remotely debug a system process (like debuggerd) using gdbserver libunwind: * found an error when unwinding via DWARF debug frames when configured for REMOTE_ONLY * discussions on the me revealed that libunwind-ptrace should not be compiled for REMOTE_ONLY case at all (it was intended for host!=target) * this means that our current build approach on Android needs to be changed in the future Misc: * internal meetings Regards Ken

14 years, 1 month

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[ACTIVITY] report week 45

by Peter Maydell

RAG: Red: Amber: upstream-omap3-cleanup stalled, not clear whether we're going to have any time for it this quarter Green: Current Milestones: || || Planned || Estimate || Actual || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || (Future milestones to be added once post-Connect planning is completed.) Historical Milestones: ||add-omap3-networking || 2011-10-13 || 2011-10-13 || 2011-10-13 || ||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || 2011-09-22 || ||a15-usermode-support || 2011-11-10 || 2011-11-10 || 2011-10-27 || == linaro-qemu-11.11 == * 2011.11 release: tarball built, tested and released == other == * nailing down A15/KVM work we're going to do this quarter * usual upstream code review/etc * sent patches upstream to fix some easy bugs somebody found running Coverity on QEMU's source code

14 years, 1 month

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[ACTIVITY] w45

by Asa Sandahl

Hi! * Ran EEMBC and SPEC on the ursa4. Sorted out a bunch of basic questions related to permissions ans such with Michael. Familiarized myself with the scripts for parsing benchmark results. * Created wiki for running benchmarks in cbuild. It is in my sandbox right now: https://wiki.linaro.org/AsaSandahl/Sandbox/RunningBenchmark * Started off SPEC runs for comparing the "train" and "ref" data sets. We want to know if the changes between variants are the same for the two sets. Best regards Åsa

14 years, 1 month

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Linaro QEMU 2011.11 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2011.11. Linaro QEMU 2011.11 is the latest monthly release of qemu-linaro. Based off upstream (trunk) QEMU, it includes a number of ARM-focused bug fixes and enhancements. New in this month's release: - The ARM vexpress-a9, versatilepb, versatileab and realview-* boards now have audio support (thanks to Mathieu Sonet who contributed a PL041 implementation upstream) - Support for multiple instances of the "-sd" option on the command line has been dropped; this was never present in upstream QEMU and has been removed for consistency. Use "-drive,if=sd,index=N,file=file.img" for N=0,1,2... instead - Fixes #886980: 8 and 16 bit reads from the OMAP GPIO module would crash due to an infinite recursion - Fixes #823902: problems running multithreaded programs in linux-user mode Known issues: - Graphics do not work for OMAP3 based models (beagle, overo) with 11.10 Linaro images. NB: if you run QEMU on a host system without properly configured audio you might find that QEMU now hangs at some point; you can fix this by fixing your host system, or work around it by setting the environment variable QEMU_AUDIO_DRV=none. If you build from source you may now want to pass configure a suitable --audio-drv-list=LIST option. The source tarball is available at: https://launchpad.net/qemu-linaro/+milestone/2011.11 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, 1 month

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[ACTIVITY] November 6-10

by Ira Rosen

Hi, - SLP improvements for weight-h264-pixels16x16-8 (libav): - conditions in SLP - committed upstream - support pattern detection in SLP - implemented - enhance mixed condition pattern to handle non-constant then/else clauses - implemented weight-h264-pixels16x16-8 now gets vectorized with 2.6x speedup. - Vectorizer maintenance (bug fixes, patch reviews). I'll be on vacation on Sunday. Ira

14 years, 1 month

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FW: contribution Linux Kernel Debugger

by Marc TITINGER

Hi there, As discussed with Loïc, please find attached my slides to the ELCE presentation related to our implementation of linux-awareness for JTAG debugging. I still need a formal clearance of my organization on my contribution patch, but I (and my managers) will be happy to see some or all of this work benefit to-and-from the community. If you are interested, I will try to upload a self-contained qemu-based demo to a public ftp. Cheers, Marc Titinger. > -----Original Message----- > From: Loïc Minier [mailto:lool@dooz.org] > Sent: Wednesday, November 02, 2011 3:19 PM > To: Marc TITINGER > Cc: Michael Hope; Ulrich Weigand > Subject: Re: contribution Linux Kernel Debugger > > On Wed, Nov 02, 2011, Marc TITINGER wrote: > > J'ai été content de vous rencontrer toi et Nicolas à la suite de ma > > présentation pour discuter de l'opportunité de la contribution de > > notre debugger linux. J'ai une question: dans la mesure ou STMicro ne > > fait pas partie des membres de linaro, aurais-je un accès restreint > > aux outils et discussions si je souhaite contribuer? Quels serons les > > blueprints correspondant à ce projet ? > > Most things Linaro does are public; concerning the toolchain, > benchmarks are kept private due to licensing constraints. Even if > STMicro is not a member, you're welcome to present your ideas and code > to us (we don't mind if STMicro joins as a member though ;-). > > We covered topics similar to your ELC-Europe talk this week: > https://blueprints.launchpad.net/linaro-toolchain-misc/+spec/linaro- > toolchain-kernel-debugging > > Ulrich Weigand and Michael Hope will continue discussions around where > we will go in terms of helping kernel debugging next cycle, it might > be > that we end up working on similar areas than the ones you and I > discussed (special handling for linux in GDB -- tasks, backtracing > across kernelspace/userspace; OpenOCD fixes...). > > Your slides don't seem to be at > https://events.linuxfoundation.org/events/embedded-linux-conference- > europe/titinger > yet, so perhaps you could share a link with Michael and Ulrich? or > post on the linaro-toolchain@ mailing-list > > We'll be a bit busy this week, but if you want to discuss your > patches, > upstreaming, further developments, I would think Michael can arrange > for you to join a Toolchain WG call in the next weeks -- Michael, I'll > let you comment once you get to see the slides :-) > > -- > Loïc Minier

14 years, 1 month

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[ACTIVITY] WW43

by Zhenqiang Chen

Summary: * Add zlib and libiconv support in crosstool-ng and repack embedded toolchain source package. Details: * Read crosstool-ng scripts, configs and document to learn on how it works. * Try mkedwards's extensions for crosstool-ng at https://github.com/mkedwards/crosstool-ng. It does have lots of extensions, the GDB-cross can build. But zlib and libiconv do not meet our requirement. * Add config, patch and build scripts for zlib and update the binutils build scripts to use the prebuilt zlib. * Add config and build scripts for libiconv and update the build scripts of gcc and gdb. * Write scripts to patch and repack embedded toolchain source packages to the standard format. Plans: * Linaro connect: Oct. 31 - Nov. 4. * Integrate the repack scripts with crosstool-ng. Thanks! -Zhenqiang

14 years, 1 month

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[ACTIVITY] report week 44

by Peter Maydell

RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || Historical Milestones: ||add-omap3-networking || 2011-10-13 || 2011-10-13 || 2011-10-13 || ||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || 2011-09-22 || ||a15-usermode-support || 2011-11-10 || 2011-11-10 || 2011-10-27 || == other == * Linaro Connect week. Included an extremely useful double-length session about KVM on A15, which should turn into blueprints/plans in due course * Found out a bit more about UEFI -- I'm leaning towards having QEMU for vexpress run UEFI by default as a way of letting you just pass it a disk image rather than having to feed it a separatekernel/initrd. (Will look into this more when the ARM landing team have it all building and working on hardware.) * I have a working prototype of the QEMU virtio-mmio transport (written to Pawel's spec). However to get this upstream we will first need to properly refactor the qemu virtio code so the link between the transport and the blk/net/etc backends is a qdev bus. -- PMM

14 years, 1 month

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[ACTIVITY] weekly status

by Revital Eres

Continue working on the regsiter pressure estimation implementation - testing the implementation on libav micro benchmarks. With the patch some SMSed kernels in put-h264-qpel8-hv-lowpass-8, swscale-rgb24ToY_c mjpegenc benchmarks are identified as having register pressure. I'm looking at the kernels which still have regressions with SMS and it seems the reason is not related to register pressure.

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Video - Toolchain support for kernel debugging

by Michael Opdenacker

Hi Ulrich, Here's a video of your session about kernel debugging: http://www.youtube.com/watch?v=_lIz0W3l2E8 Thanks, Michael. -- Michael Opdenacker - Community Manager Linaro, http://linaro.org Phone: +33 484 253 396 IRC: 'opm' in #linaro on irc.freenode.net

14 years, 1 month

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LAVA recipe

by Andrew Stubbs

Hi All, This is a brain dump of what I learned about running LAVA today. Dave will probably find a place for this in the Validation wiki, but I'll pass it round in the meantime. Hope it helps Andrew

14 years, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, * libunwind * posted small bug fixes * noticed the unwinding on Android is broken somehow (need to track down the commit that broke it) * linaro android * repo sync fails due invalid bionic commit id (#885792) * tried to remotely attend the Connect * +1 for having live streams of the plenaries (http://video.ubuntu.com/live/) * -1 for pointing us to the wrong grand sierra irc channels (http://uds.ubuntu.com/participate/remote) * icecast streams worked most of the time (* public holiday on tuesday) Regards Ken

14 years, 1 month

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[ACTIVITY] 2011-11-04

by David Gilbert

=== 64 bit atomics * I got the race in membase down to a futex issue, and asking dmart pointed me at a kernel bug that affects recent kernels where a fix had gone in about a month ago. That was a nasty one! * I've still got a few bugs left; most are turning out to be timing races in the test code (e.g. one that times out after 2seconds but the code takes around 1.7 seconds ish - but if something else gets in trips over the line, and another one where it did a recv_from on a socket but only got the start of a message, presumably because the sender had used multiple sends). It's tricky going because the tests are a combination of most scripting languages (perl, python, ruby with a splash of Erlang). I've so far found no bugs in the atomic code. * I looked at apr and SDL-1.3; both of which use atomics; but end up not using 64bit atomics; the tendency is for them to ensure they can do atomics on long and on a void*; both of which for us are 32bit. === String routines * I've got the Newlib A15 optimised memcpy running in a test harness at the moment for comparison. === Listening to connect * I listened in to a few connect sessions each day; the 1st day or so was 3/4 lost on audio systems that didn't work (I'm especially annoyed at not being able to hear the QEMU for A15/KVM session and toolchain support for kernel). The Rypple session was rather lost through the lack of any screen share or slides.

14 years, 1 month

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Linaro Cross Compiling

by Lalancette, Christopher

Hello all, I've been playing around with linaro and have it working on my Pandaboard locally. I have a couple of questions about the linaro environment; if this is the wrong forum, I'm happy to take it elsewhere. I see that Linaro makes monthly releases of the hwpacks and images. How are the packages/binaries in those images created? Are they cross-compiled, or compiled natively on the target platform? If they are cross-compiled, how is the environment created? The reason I ask is that we've been looking at cross-compiling some packages ourselves, and have been running into issues. So we were wondering what toolchain the linaro community uses. Thanks in advance, -- Chris Lalancette

14 years, 1 month

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Linaro Cross Compiling

by Lalancette, Christopher

Hello all, I've been playing around with linaro and have it working on my Pandaboard locally. I have a couple of questions about the linaro environment; if this is the wrong forum, I'm happy to take it elsewhere. I see that Linaro makes monthly releases of the hwpacks and images. How are the packages/binaries in those images created? Are they cross-compiled, or compiled natively on the target platform? If they are cross-compiled, how is the environment created? The reason I ask is that we've been looking at cross-compiling some packages ourselves, and have been running into issues. So we were wondering what toolchain the linaro community uses. Thanks in advance, -- Chris Lalancette

14 years, 1 month

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[ACTIVITY] Oct 30 - Nov 3

by Ira Rosen

Hi, - Finished rewriting SLP analysis to support not only unary and binary operations. Committed upstream. - Implemented cond_expr support in SLP (for libav weight_h264_pixels). Testing it now. - Vectorizer maintenance (test/bug fixes, patch reviews). Ira

14 years, 1 month

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Todays performance meeting is cancelled

by Ramana Radhakrishnan

We are trying to organise a phone and merge this with the pgo session. Sorry about the short notice. Ramana

14 years, 1 month

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[ACTIVITY] weekly status

by Revital Eres

Testing an initial version of the implementation which estimates register pressure in SMS on libav micro benchmarks. I see 20% improvements in mjpegenc microbench and 11% on aacsbr-2 with SMS. However swscale-rgb24ToY_c still have spills in the final code although it requires maximum 64 VFP_REGS registers out of the available 64 registers so I'm trying to understand the reason for the spill.

14 years, 1 month

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[Activity] Week ending 28th Oct 2011

by Ramana Radhakrishnan

==Progress=== * Off for one day during the week for Diwali. * Connect preparation - Wrote down areas to look at during connect and tried to plan what we want to look at during connect. * Looked at some of the cases with vcond<float> with Ira and helped frame blueprint. * Investigated one of the big performance regressions in the popular embedded benchmark and looked at why it wasn't being vectorized only to realize that it couldn't be. Thanks Ira. Still don't know why ARM state is 22% faster than Thumb2 state. * Looked at the issue with fPIC where GCSE appears to remove a label for sometime but not much progress. === Plans === * Connect ! next week and then vacation. Absences. * 26 Oct - Diwali * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - * 08 Nov - 11 Nov - Vacation booked * Dec 19 - 31st Dec - Vacation booked

14 years, 1 month

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[ACTIVITY] 2011-10-28

by David Gilbert

== 64 bit atomics == * I've been building and testing membase * Version 1.7.1.1 source builds OK (after turning off -Werror due to some of their curious type naming) * The git version fails to build - it doesn't seem consistent * 1.7.1.1 passes simple tests, but there are 3 tests in its test suite that intermittently fail on ARM and seem to be solid on x86. (There are also some that just require timeouts increased due to the relatively slow machine). * t/issue_163.t turned out to be a timing race in the test itself, made worse by being on a relatively slow machine and probably made worse by the Pandas odd idea of timing. That was reported to them with a break down of it, and upstream has fixed their test. ( http://code.google.com/p/memcached/issues/detail?id=230 ) * t/issue_67.t is proving tougher; once in a while memcached will lock up during init in thread_init; there is one particular point where adding a printf will make it work apparently reliably. I've got one or two ideas but I need to check my understanding of pthread_cond_wait first. * There is an assert I've seen triggered once - not looked at that yet. == String routines == * While I was off last week, my memchr and strlen were accepted into newlib * Joseph has responded to my eglibc mail, with a couple of small queries. == Other == * Wrote a more detailed test case for bug 873453 (odd timing behaviour on panda); it's quite odd - I can get > ~80ms timing discrepency so it's not a clock granularity issue. * Replicated a QEMU crash for Peter. Dave

14 years, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, * finished changing libunwind to be more portable * tested patchset on ARM and X86_64 * now builds on Android without modifications (Android.mk, config.h and libunwind-common.h are still required) * verified that the modified debuggerd still works * discussed backtracing using libunwind on ARM with Harald from the BSC * they use libunwind in a sampling tool that generates Paraver tracefiles * started to upgrade my Linaro Android environment and ran into issues * need to check: * why building the toolchain using linaro-build.sh fails * why repo sync fails due to invalid platform/bionic SHA1 * what happened to LEB-panda.xml Regards Ken

14 years, 1 month

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[ACTIVITY] report week 43

by Peter Maydell

RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||a15-usermode-support || 2011-11-10 || 2011-11-10 || 2011-10-27 || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || Historical Milestones: ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 || ||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || 2011-09-15 || ||add-omap3-networking || 2011-10-13 || 2011-10-13 || 2011-10-13 || ||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || 2011-09-22 || == a15-usermode-support == * A15 instruction support patches committed upstream in time for upstream's 1.0 release == upstream-omap3-cleanup == * some work on restructuring the omap3 patchset -- it's now basically in the right order and the last 'touches several different bits of code' jumbo patch has been split == other == * sent some patches upstream which address the main things I want to get into qemu 1.0 (PL041 audio support and fixing a regression in handling multithreaded programs in linux-user mode) * A15 KVM planning work and other preparation for Linaro Connect * finally tracked down the qemu-on-ARM memory corruption: we mmap the code generation buffer at 0x1000000 with MAP_FIXED; unfortunately this is now in the middle of glibc's heap... (filed as LP:883133) * qemu now has a coroutine implementation which defaults to using makecontext() if it is present. Unfortunately ARM eglibc provides an implementation which always returns ENOSYS, which is a bit tricky to detect with a compile time configure check (without breaking cross-compilation support). * these two things (and some other known bugs) mean that QEMU on ARM hosts is basically broken, and will probably continue to be since we don't have the spare resource to test and fix bugs (beyond those which we need to fix for KVM-on-ARM)

14 years, 1 month

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[ACTIVITY] w43

by Asa Sandahl

* Looked at how to configure Firefox and how to build different parts of the program. Usage of .mozconfig, myrules.mk and myconfig.mk. * Tested the Talos framework. https://wiki.mozilla.org/Buildbot/Talos. I think it would be good to use Talos for the browsing benchmarks. We can discuss it further at connect. * Preparing for connect. Best Regards Åsa

14 years, 1 month

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[ACTIVITY] WW42

by Zhenqiang Chen

Summary: * Exercise crosstool-ng and summarize the gaps. Details: * Exercise crosstool-ng (1) Sync with lp:~linaro-toolchain-dev/crosstool-ng/linaro. (2) Try to config linux-host-baremental-target an mingw32-host-baremental-target. (3) Try to build the toolchain for both embedded toolchain and linaro-gcc-4.6-2011.10 with the config. . C compiler for linux and mingw32 hosts and c++ compiler for linux host can be built without any change. . C++ compiler for mingw32 host can be built after PCH is disabled. . GDB-cross build fail due to dependence packages. * Gaps in crosstool-ng (1) Improve GDB-cross scripts to download and build the dependence packages: expat and ncurses. Or put expat and ncurses as companion_libraries. (2) To remove dependence, embedded toolchain requires more prerequisites like zlib. New config and scripts are required to support the packages. (3) Currently, the embedded toolchain source packages are released as a tarball, which includes gcc, gmp, etc. New scripts are required to support it. (4) To make sure the toolchain can run with lower version glibc like redhat4/5, the embedded toolchain requires lower version native gcc4.3.6 to build it. To support it, . Users can build the native gcc manually, or . Enhance the scripts to add one step to build native gcc. (5) All the default package configurations are different from embedded toolchain internal build scripts. Since the configurations in embedded toolchain had been tuned and tested, we will change the configurations in crosstool-ng if they do not match and not configurable. The same rule will apply for linaro toolchain. Plans: * Write scripts to re-pack the embedded toolchain source packages. * Add the supports for all prerequisites in crosstool-ng menuconfig. Thanks! -Zhenqiang

14 years, 1 month

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[ACTIVITY] 24th - 28th October

by Andrew Stubbs

Posted a patch upstream to fix big-endian for generic tuning. This was a simple omission from my previous patches. Merged GCC 4.6.2 to Linaro GCC. It's still in testing now, so I'll have to commit it sometime over the weekend or next week. Looked at the benchmark results from Spec2000 running on both A8 and A9 systems, with and with NEON, and with various compiler options. Posted the results in a spreadsheet (visible within Linaro only). Begun making adjustments to generic tuning and started new spec2k runs to see if they are beneficial. First, I'm trying A9 prefetch settings on A8 to see how much damage it does. Next I'll try enabling the A8 NEON tuning settings on A9 to see what happens there. Prepared for travel next week. Vacation Friday

14 years, 1 month

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[ACTIVITY] October 23-27

by Ira Rosen

Hi, - Merged to gcc-linaro: - widening shifts - SLP features: support loads with different offsets and swap operands if necessary - Started rewriting SLP analysis to support operations with more than two operands (towards SLP of conditions) - Updated NEON presentation following Ramana's suggestions (thanks!) - Suggested to Ramana to implement vcond with mixed types, created a blueprint: https://blueprints.launchpad.net/gcc-linaro/+spec/vcond-with-mixed-types - Vectorizer: - updated vectorizer's webpage - updated vectorizer's wiki page - the usual maintenance - Committed upstream two SLP data-ref analysis improvements: PR 50730 and PR 50819 Ira

14 years, 1 month

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Toolchain Connect sessions

by Michael Hope

Hi there. Connect is just around the corner. Have a look at: https://wiki.linaro.org/MichaelHope/Sandbox/Q4.11Plans for a summary of the toolchain sessions and hacking topics. It would be great to have kernel and OCTO input in the ARM STM driver, Kernel debugging, and KVM sessions. -- Michael

14 years, 1 month

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Toolchain performance call during connect.

by Ramana Radhakrishnan

Hi Folks, Draft agenda for the performance meeting next week at Connect - https://blueprints.launchpad.net/gcc-linaro/+spec/linaro-toolchain-performa… Are there any topics that people would like to bring up during this meeting other than the ones listed here ? I suspect that we'll probably just have about 10-15 minutes for a topic in this case. I am not considering discussing PGO related stuff in this session given that we've got another session in which we can discuss this. Thoughts ? cheers Ramana

14 years, 1 month

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Performance improvements hacking time at Connect Q4.11

by Ramana Radhakrishnan

Hi Folks, I've been trying to capture what we want to do in terms of hacking time and some of the performance related backlog that we have in the system. I have done so here. https://wiki.linaro.org/RamanaRadhakrishnan/Sandbox/Q411ConnectGCCPerfPlan I'm on vacation tomorrow but should be picking email for sometime during the day. Thoughts about what else we could be doing in this area or if there's a better way we could use our hacking time. cheers Ramana ---

14 years, 1 month

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Building gcc-linaro 4.6 2011.10 on ubuntu 11.10 32bit for cortex-a9

by Bruno Niklaus

hi@all i try to build the linaro-gcc on a ubuntu host 11.10 32 bit for a cortex a9. but it doenst build to the end. this is the first time ever i try to build a toolchain on my own, so excuse me if its just a beginner-mistake. somebody has any idea? configured like this *./configure --target=arm-linux-gnueabi --disable-bootstrap --enable-languages=c,c++ --with-mode=thumb --with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=neon --with-float=softfp --prefix=/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10* * * no errors when configuring, but it fails during building with this error: *checking for suffix of object files... configure: error: in `/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/arm-linux-gnueabi/libgcc': * *configure: error: cannot compute suffix of object files: cannot compile* *See `config.log' for more details.* *make[1]: *** [configure-target-libgcc] Fehler 1* *make[1]: Verlasse Verzeichnis '/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src'* *make: *** [all] Fehler 2* when i check the ./arm-linux-gnueabi/libgcc/config.log the errors which return 1 are: *configure:3028: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -V >&5* *xgcc: error: unrecognized option '-V'* *xgcc: fatal error: no input files* *compilation terminated.* *configure:3039: $? = 1* *configure:3028: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -qversion >&5* *xgcc: error: unrecognized option '-qversion'* *xgcc: fatal error: no input files* *compilation terminated.* *configure:3039: $? = 1* *configure:3055: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -o conftest -g -O2 conftest.c >&5* */home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/as: line 87: exec: -m: invalid option* *exec: usage: exec [-cl] [-a name] [command [arguments ...]] [redirection ...]* *configure:3058: $? = 1* *configure:3246: checking for suffix of object files* *configure:3268: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -c -g -O2 conftest.c >&5* */home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/as: line 87: exec: -m: invalid option* *exec: usage: exec [-cl] [-a name] [command [arguments ...]] [redirection ...]* *configure:3272: $? = 1* *configure: failed program was:* *| /* confdefs.h */* *| #define PACKAGE_NAME "GNU C Runtime Library"* *| #define PACKAGE_TARNAME "libgcc"* *| #define PACKAGE_VERSION "1.0"* *| #define PACKAGE_STRING "GNU C Runtime Library 1.0"* *| #define PACKAGE_BUGREPORT ""* *| #define PACKAGE_URL "http://www.gnu.org/software/libgcc/"* *| /* end confdefs.h. */* *| * *| int* *| main ()* *| {* *| * *| ;* *| return 0;* *| }* *configure:3286: error: in `/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/arm-linux-gnueabi/libgcc': * *configure:3289: error: cannot compute suffix of object files: cannot compile* *See `config.log' for more details.*

14 years, 1 month

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ARM eglibc: adding ucontext?

by Peter Maydell

At the moment ARM eglibc doesn't support the functions declared in ucontext.h: getcontext(), setcontext(), swapcontext() and makecontext(). Instead you get implementations which always fail and set errno to ENOSYS. QEMU uses these functions to implement coroutines. Although there is a fallback implementation in terms of threads, there are reasons why using the fallback is suboptimal: * its performance is worse * it will be less tested, because x86_64 and i386 both implement the ucontext functions and so QEMU on those hosts will be using different code paths * I'm not aware of a good way at configure time to detect whether getcontext() et al will always fail without actually running a test binary, which won't work in a cross-compile setup. (If eglibc just didn't provide the functions at all this would be much simpler...) We're going to care about performance and reliability of QEMU on ARM hosts as we start to support KVM on Cortex-A15, so it would be good if we could add ucontext function support to eglibc as part of that effort. Opinions? Have I missed some good reason why there isn't an ARM implementation of these functions? (I'm aware that the ucontext functions have been removed from the latest version of the POSIX spec; however AFAIK there's no equivalent functionality that replaces them so I think they're still worth having implementations of for parity with other architectures.) -- PMM

14 years, 1 month

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[Activity] Week ending 21st Oct 2011

by Ramana Radhakrishnan

==Progress=== * Some upstream patch review. * Spent time looking at LP 836588 which is a case where CSE removes a particular label access in one case but doesn't remove it from the list of things in the constant pool which is quite bizarre. Will probably need some help with looking into this one. * Sent out vcvt.f32 and vcvt.f64 patches . * Connect preparation - laptop cleanup and getting it finally onto an x86_64 distribution. * Looked at some of the vec_perm / vec_rev cases in Neon with Ira. * Spent some time looking at some of Andrew's issues with generic-v7a tuning especially the cases where it was doing better and gave some suggestions. === Plans === * Prepare for Connect. * Prepare by looking at some of the large differences between various comparative benchmarks. * Some research into PGO related stuff. * Try to upstream some more of my patches in the backlog before the end of the week. * Finish off some internal paperwork. * I'm off on 26th - Wednesday. Absences. * 26th Oct - Day off. * 31st Oct - 4th Nov - Linaro Connect Q4.11 * 08 Nov - 11 Nov - Tentatively booked * Dec 19 - 31st Dec - Tentatively booked

14 years, 1 month

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[ACTIVITY] 17th - 21st October

by Andrew Stubbs

Continued looking at my constant reuse optimization. I've identified a couple of hundred optimization opportunities in the whole of gcc itself, which is fewer than I had hoped. There are almost no opportunities when compiling for size as constants are always loaded from a constant pool in that case (I'm not sure why that's the case, given that this isn't any more space efficient than movw+movt, unless it can share the constant in more than one place). Backported my -mtune=native patch to Linaro GCC. Backported my generic tuning patch to Linaro GCC. Backported my pr50717 patch to Linaro, and pushed to Launchpad for testing. Analysed my benchmark results I made to aid generic tuning. Disappointingly the A8/A9 tuning is not as beneficial as one would like. In fact, the existing generic tuning patch (which was supposed to be a framework only) is actually quite competitive and gives better performance in some cases. Set more benchmarks running, this time with NEON enabled. That's about 36 hour's worth on A9, and more like 90 hours on my A8 (obviously, there's some difference in the clock speeds there). Discovered that my native tuning code won't compile with a C++ compiler (GCC Bugzilla PR50809). Tested and committed a fix upstream.

14 years, 1 month

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[ACTIVITY] weekly status

by Revital Eres

Hello, Continue the implementation of estimating register pressure in SMS. Discussed with Richard some issue raised while implementing. Revital

14 years, 1 month

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[ACTIVITY] Oct 17 - Oct 21

by Ulrich Weigand

== GDB == * Worked on support for cross-platform core file generation. Posted initial set of patches for comments. * Created "Toolchain support for kernel debugging" blueprint. 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, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, I made some progress on transforming the hacks I did to get libunwind working on Android into proper patches that can go upstream. Things learned: * bionic employs OpenBSD header files that therefore lack some GNU and ARM specific defines (only small fix needed - plan is to change libunwind to work with non-patched bionic too) * Android basically provides all the functionality that is required for libunwind-ptrace - but... * no one seems to build libunwind with remote unwind functionality (including libunwind-ptrace) only * most of the issues can be avoided by changing libunwind to be more portable Regards Ken

14 years, 1 month

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[ACTIVITY] w42

by Asa Sandahl

* Still having trouble with using multistrap/pdebuild-cross for cross-compiling Firefox - it looks like only x86 packages get downloaded, not armel. I have asked Wookey for advice, and he will try to reproduce the build. * Falling back to native compiling until the cross-compiling set up has been sorted out. I will now take a look at how to pass different compiler options to the Mozilla build system and how to build different parts of the program. Best Regards Åsa

14 years, 1 month

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[ACTIVITY] report week 42

by Peter Maydell

(short week: 4 days) RAG: Red: Amber: Green: blog started :-) http://translatedcode.wordpress.com/ Current Milestones: || || Planned || Estimate || Actual || ||a15-usermode-support || 2011-11-10 || 2011-11-10 || || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || Historical Milestones: ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 || ||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || 2011-09-15 || ||add-omap3-networking || 2011-10-13 || 2011-10-13 || 2011-10-13 || ||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || 2011-09-22 || == other == * upstream patch review, putting together pull requests * more time spent on qemu on ARM host apparent memory corruption bug (no luck yet :-(); found a Valgrind bug in the process, though (KDE:284472). This ate up way too much of this week. * A15 KVM planning work * meetings etc * moved over to patches.linaro for QEMU patch tracking -- PMM

14 years, 1 month

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[ACTIVITY] October 16-19

by Ira Rosen

Hi, * widening shifts - finally committed upstream * SLP loads with different offsets and operand swaps - committed upstream * SLP with multiple types - merged to gcc-linaro-4.6 * vectorizer stuff: patch review, test fixes, discussions, bug fix * Ramana and I discussed what can be done with VEC_PERM_EXPR for NEON, and created https://blueprints.launchpad.net/gcc-linaro/+spec/support-vec-perm for this issue. Ira

14 years, 1 month

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64 bit operations

by Michael Hope

Following on from last night's performance call, I had a look at how 64 bit integer operations are mapped to NEON instructions. The summary is: * add - fine * subtract - fine * bitwise and - fine * bitwise or - fine * bitwise xor - fine * multiply - can't as the instruction tops out at 32 bits. Might be able to compose using VMLAL * div, mod - no instruction * negate - instruction tops out at 32 bits, but could be turned into vmov #0, vsub * left shift constant - missing * right shift constant - missing * right arithmetic shift constant - missing * left shift register - missing * right shift register - tricky, as you do this as a left shift -register * not - no instruction, but could be done through a vceq, #0? * bitwise not - missing I also noticed that the replicated constants aren't being used. A pre-increment is load constant pool; vadd but could be done as a vmov, #-1; vsub. The same with pre-decrement - it could be done as a vmov, #-1; vadd. This seems worth blueprinting. -- Michael

14 years, 1 month

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agenda for today's call.

by Ramana Radhakrishnan

https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2011-10-18 I don't have much for this week personally given I've had 2 very short weeks. Ramana

14 years, 1 month

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limits-fndefn.c and timeouts

by Michael Hope

limits-fndefn.c takes an impressively long time to run. On an idle machine, -O3 -g -c takes 17:31 and -O2 -g -c takes The test already has a dg-timeout-factor of 4 giving a total timeout of 20 minutes. Removing the -g brings this down to 30 s. Keeping the -g and adding -fno-var-tracking brings this down to 45 s. We could bump the multiplier up to 8 but it's getting a bit ridiculous. Any thoughts? -- Michael

14 years, 1 month

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[ACTIVITY] Weekly status

by Richard Sandiford

== Last week and today == * Backported fix for returning std::pair<bool, bool>. Unfortunately this showed up a regression on 4.5. I couldn't reproduce it cross, and the testcase itself looks innocuous, so I'm wondering whether the patch might trigger a miscompilation of cc1plus. * Committed SMS register-scheduling patches upstream and backported to Linaro 4.6. * Most of the week spent on -fsched-pressure. Still trying a few variations in order to get the right balance. (My local haifa-sched.c now has about 20 new toggles.) Still feel like I'm making progress, rather than hitting the point of diminishing returns. Hope Connect goes well. See everyone in a few weeks' time. Richard

14 years, 2 months

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[ACTIVITY] 10th - 14th October

by Andrew Stubbs

Completed the 4.5 and 4.6 FSF to Linaro merges. Spun the Linaro GCC release tarballs, uploaded them to the test farm, and set off the test builds. Continued looking at the constant reuse optimization. This time I've build GCC itself with the new pass to see how many optimization opportunities there are. This shook out a lot more small bugs, which was useful. Backported my negative-shifts patch to Linaro 4.6, pushed it to Launchpad for testing, and then committed it to 4.6 once in was approved. Experimented with running SPEC2K on A8 and A9 boards in order to establish a baseline for the generic tuning tweaks. A short test doesn't give much clue as to what can be achieved, and a long test takes way too long. The problem is also complicated by the benchmarks where the A8 tuning works better on A9 than A9 tuning does. :S Received a bug report (GCC bugzilla 50717) for my widening multiplies patches. Analysed the problem, developed a patch, and posted it to gcc-patches.

14 years, 2 months

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[Activity] Week ending 14th October 2011

by Ramana Radhakrishnan

<Short week with 2 days gone on an internal training course> ==Progress=== * Some patch review. * Spent time looking at LP 836588. * Tried some different approaches for the vcvt.f64.s32 case and it looks like the simple solution is the best one unfortunately :( * 2 days off at internal training course. === Plans === * continue looking into LP 836588 * Patch review week/ * Work on getting vcvt.f* case done and finish some of the backlog. Absences. * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - * 08 Nov - 11 Nov - Tentatively booked * Dec 19 - 31st Dec - Tentatively booked

14 years, 2 months

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Screwy panda timing?

by David Gilbert

I've just tried rerunning some benchmarks on my panda, which I reinstalled recently and am getting some odd behaviour: The kernel is 3.0.0-1404-linaro-lt-omap For example: simple_strlen: ,102400, loops of ,62, bytes=6.054688 MB, transferred in ,20324707.000000 ns, giving, 297.897898 MB/s simple_strlen: ,102400, loops of ,32, bytes=3.125000 MB, transferred in ,7904053.000000 ns, giving, 395.366782 MB/s simple_strlen: ,102400, loops of ,16, bytes=1.562500 MB, transferred in ,7354736.000000 ns, giving, 212.448142 MB/s simple_strlen: ,102400, loops of ,8, bytes=0.781250 MB, transferred in ,91553.000000 ns, giving, 8533.308575 MB/s simple_strlen: ,102400, loops of ,4, bytes=0.390625 MB, transferred in ,1495361.000000 ns, giving, 261.224547 MB/s simple_strlen: ,102400, loops of ,2, bytes=0.195312 MB, transferred in ,1983643.000000 ns, giving, 98.461518 MB/s Note the 8 byte one apparently 40 times faster, and for true oddness: smarter_strlen_ldrd: ,102400, loops of ,62, bytes=6.054688 MB, transferred in ,3936768.000000 ns, giving, 1537.984331 MB/s smarter_strlen_ldrd: ,102400, loops of ,32, bytes=3.125000 MB, transferred in ,0.000000 ns, giving, inf MB/s smarter_strlen_ldrd: ,102400, loops of ,16, bytes=1.562500 MB, transferred in ,4180909.000000 ns, giving, 373.722557 MB/s Now, while I like infinite transfer rates, I suspect they're wrong. Anyone else seeing this? Dave

14 years, 2 months

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[ACTIVITY] weekly status

by Revital Eres

Implementing estimating register pressure in SMS. Experimenting with the implementation on libav microbench. Discussed with Richard some issue raised while implementing.

14 years, 2 months

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