- 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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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.

14 years, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 11 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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, 12 months

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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

15 years

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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

15 years

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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

15 years

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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

15 years

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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

15 years

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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

15 years

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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

15 years

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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

15 years

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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

15 years

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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

15 years

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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.

15 years

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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

15 years

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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

15 years

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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.

15 years

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[ACTIVITY] Oct 10 - Oct 14

by Ulrich Weigand

== GDB == * Created and published Linaro GDB 7.3-2011.10 release. * Fixed LP #871901 (Linaro GDB crashes on 3.x kernels) in mainline and Linaro GDB 7.3. * Backported mainline fix for LP #829595 (Separate debuginfo misidentified with "remote:" access) to Linaro GDB 7.3. * Completed blueprint "GDB as a cross-debugger". * Worked on support for cross-platform core file generation. == 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

15 years

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[ACTIVITY] 2011-10-14

by David Gilbert

== 64 bit atomics == * Thanks to Ramana for OKing my gcc patches; and Richard for committing them - I've backported these to the gcc-linaro branch and pushed it - hopefully those will pass OK! == String routines == * Sent my memchr patch to upstream newlib, received comments, tweeked, and resent * Sent strlen patch to upstream newlib * Spent some time getting confused by timing issues on our Panda; it got reinstalled with 11.09 a few weeks ago and is now showing some odd behaviours. In particular I'm seeing some tests show completion in 0ns (and my code isn't -that- fast!), and others where the times vary wildly - it's almost as if a timer interrupt is delayed or missing; my same test binary works fine on one of Michael's Ursa's running an older install. == QEMU == * Tested Peters QEMU image for release == Other == * Spent an afternoon reading through the System trace docs On holiday next week; I'll poll email occasionally. Dave

15 years

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[ACTIVITY] weekly status

by Ken Werner

Hi, * working through my inbox after being away * a former patch of mine accidentally broke remote unwinding on IA64 * maintainer made a quick fix that made things worse for ARM * posted a patch that aims to fix things up for all archs * identified and submitted libunwind-android patches that could go upstream * sent patch that lets another testcase pass on ARM Linux * tried to help people on the mailing list with various issues Regards Ken

15 years

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[ACTIVITY] report week 40

by Peter Maydell

RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||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 || || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || 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 || ||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 == * patches pushed into qemu-linaro and final testing done == a15-usermode-support == * this is now in qemu-linaro 2011.10; only remaining thing is for the patches to be taken upstream (no major review issues) == linaro-qemu-11.11 == * qemu-linaro 2011.10 released == other == * completed a desk move * some sw/hw archaeology to answer a question about the FIFO size of the PL041 on ARM devboards as part of reviewing audio support patch * trying to track down a really weird problem where qemu on ARM host dies with apparent memory corruption

15 years

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[ACTIVITY] w41

by Asa Sandahl

* Working on using pdebuildcross/multistrap when cross compiling Firefox. With multistrap all dependencies should be sorted out automatically. The current status is that pdebuild-cross for armel is set up and the compilation of the Firefox package starts. Does not come all the way though, because some dependencies (for X11) are not in place after all. Will continue investigation. Best Regards Åsa

15 years

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upstream planning using Linaro process

by Mounir Bsaibes

A lot of concerns were raised about how to plan for upstreaming work using Linaro process while there is no guarantees for acceptance. Deepak has setup a session to address this issue and come up with a reasonable solution to the problem. In preparation, I have put together this google doc and shared it with all in Linaro. https://docs.google.com/a/linaro.org/document/d/1Inj3Esvk4Lbqe5PN7NHnK1WKRa… Please take a look at this document ahead of the session, if you have a proposal for a solution (or any other feedback) please let us know, so we can add it to the discussion. We are hoping a lot of engineers would provide feedback and attend the session so we can come up with a conclusion. To subscribe to the session please follow: https://blueprints.launchpad.net/linaro/+spec/linaro-general-upstream-proce… Thanks & regards, Mounir -- Mounir Bsaibes Project Manager Follow Linaro.org: facebook.com/pages/Linaro/155974581091106 http://twitter.com/#!/linaroorg http://www.linaro.org/linaro-blog <http://www.linaro.org/linaro-blog>

15 years

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Linaro QEMU 2011.10 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2011.10. Linaro QEMU 2011.10 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: - Instructions introduced with the Cortex-A15 (ARM mode SDIV and UDIV, and the VFPv4 fused multiply-accumulate instructions VFMA, VFMS, VFNMA, VFNMS) are now supported in linux-user mode - Beagle models now support USB networking (run the model with "-usb -device usb-net,netdev=mynet -netdev user,id=mynet") Known issues: - 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/2011.10 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

15 years

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Linaro GCC 4.6 and 4.5 2011.10 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2011.10 release of both Linaro GCC 4.6 and Linaro GCC 4.5. Linaro GCC 4.6 2011.10 is the eighth release in the 4.6 series. Based off the latest GCC 4.6.1+svn179483, it contains a range of vectoriser performance improvements and general bug fixes. Interesting changes include: * Updates to 4.6.1+svn179483 * Vectorises more straight-line code with data dependencies * Now picks the best vector width when vectorising straight line code * Better handles handling auto increment addresses in SMS * Changes the default vector width from double word to quad word * Better handling extracting the top or bottom half of a quad word vector * Now supports the NEON absolute difference instruction Fixes: * LP: #689887 ICE in get_arm_condition_code * LP: #809761 oss4 version 4.2-build2004-1ubuntu1 failed to build on armel Linaro GCC 4.5 2011.10 is the fifteenth release in the 4.5 series. Based off the latest GCC 4.5.3+svn179438, this is a maintenance focused release. Interesting changes in 4.5 include: * Updates to 4.5.3+svn179438 Fixes: * LP: #689887 ICE in get_arm_condition_code The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.6-2011.10 https://launchpad.net/gcc-linaro/+milestone/4.5-2011.10 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro More information on the features and issues are available from the release page: https://launchpad.net/gcc-linaro/4.6/4.6-2011.10 https://launchpad.net/gcc-linaro/4.5/4.5-2011.10 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

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Linaro GDB 7.3 2011.10 released

by Ulrich Weigand

The Linaro Toolchain Working Group is pleased to announce the release of Linaro GDB 7.3. Linaro GDB 7.3 2011.10 is the third release in the 7.3 series. Based off the latest GDB 7.3, it includes a number of ARM-focused bug fixes and enhancements. This release contains: * Support for disabling address space randomization in gdbserver * Fix for GDB crashes on 3.x kernels * Fix spurious "CRC mismatch" warnings when using "remote:" sysroot The source tarball is available at: https://launchpad.net/gdb-linaro/+milestone/7.3-2011.10 More information on Linaro GDB is available at: https://launchpad.net/gdb-linaro

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[ACTIVITY] October 9-12

by Ira Rosen

Hi, * Finished a presentation for NEON forum. Revital and Richard kindly agreed to take a look and gave me some valuable comments. Thanks! * widen-shifts: - While preparing the presentation I found some room for improvement in the pattern detection, so I implemented it. It gave additional 13% to rgb24tobgr16. - Ramana suggested a solution on how to check the constant operand of vshll. Testing these two things on ARM. * SLP improvements: - Implemented a patch that swaps operands if necessary to make the operations isomorphic, and supports loads with different offsets. Testing it now. - The three relevant libav loops now get vectorized giving 42%-57% speedup. Next week holidays: half days Sunday-Wednesday and Thursday. Ira

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Binary toolchain questions summary

by Michael Hope

Here's my summary from Monday's meeting on the harder parts of binary toolchains. Using a 4.6 compiler against a 4.5 based sysroot such as Natty: * libgcc and libstdc++ are part of the compiler * The compiler expects features that are in the corresponding runtime * You can't reliably run or validate against an earlier runtime The solution is to upgrade the runtime on the sysroot to 4.6. 4.6 is backwards compatible. Ubuntu did this with Maverick and it caused no problems, although problems such as Debian #622783 have been seen. Multiarch: * The Ubuntu multiarch patch should work with a sysroot * Multiarch and multilib should work together Multilib: * The current ARM multilib rules are old and not very relevant * Multilib means you need multiple sysroots as well * Skip multilib for the first release Other: * Anything we support in cross we should support native first * Check that we don't have to directly supply the source that goes with the binary sysroot -- Michael

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How to install an ARM cross compiler

by Andrew Stubbs

Saw this, thought it might be interesting if we want to point people at it something in future .... http://playterm.org/r/install-an-arm-cross-compiler-1316950150 Maybe we could record some more detailed stuff ourselves? Andrew

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[Activity] Week ending 7th Oct. 2011

by Ramana Radhakrishnan

==Progress=== * Out of office for a day. * Wrote a quick patch to do vcvt.f32.s32 with fractional bits where we can. Tested no regressions, need to commit this after review upstream. * Desk move and packing for that. * Looked at a bug report LP 836588 appears to go away with fno-gcse. Needs more digging. === Plans === * Look at LP 836588. * Finish auto-inc-dec pipeline scheduling work. * Clear out some of the old patches (POST_MODIFY_DISP for vfp, BRANCH_COST ) * Settle into new desk. * Again a short week as I'm away for 2 days for an internal training event. Meetings: * 1-1s * TCWG calls Absences. * 5th October - out of office. * 13th - 14th October - Out of Office - Internal training event. * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - * 08 Nov - 11 Nov - Tentatively booked * Dec 19 - 31st Dec - Tentatively booked

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[ACTIVITY] Weekly status

by Richard Sandiford

== Last week == * Patch review. * Backported second attempt to fix get_arm_condition_code ICE. * Worked on -fsched-pressure. Experimented with various combinations of ideas. This is giving some good results (e.g. a 2x improvement in libav's put_h264_qpel8_hv_lowpass_8) but needs a bit more work to fix some outliers. I'll be away from 18th Oct to 14th Nov. Richard

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Native build performance

by Michael Hope

Random data for the day: Dave Pigott has installed some new PandaBoard build machines in the validation lab. They're identical to mine except that root is on USB Flash instead of NFS, and they have a much faster flash drive for the build area. The time taken to bootstrap and test gcc-linaro-2011.09 with C, C++, Fortran, and LTO is: * ursa3, ursa4 (Toshiba USB stick): 301 minutes build / 369 test * ursa2 (no-name USB stick): 324 minutes build / 422 test * tcpanda (fast USB stick): 274 minutes build / 265 test So the new combo gives a 1.38 x faster build. I'm surprised as I though the build was CPU bound. I'd hate to see what building on an SD card is like. Note that /tmp is in RAM, /scratch is ext4, the new boards use noatime, and the kernel doesn't have the new USB performance fix. -- Michael

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[ACTIVITY] weekly status

by Revital Eres

Continue working on estimating register pressure with SMS: - Discussed current approach with Richard which gave useful leads. - Started to implement this approach. - Doing experiments on libav microbench.

15 years

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Re: Use of memcpy() in libpng

by jbowler＠acm.org

The unaligned accesses in libpng are, for the large copies, a bug. Our attempt to align the row buffer to a 16 byte boundary was off-by-one so we end up always mis-aligning it. I've posted a patch on the png-mng-implement list: http://sourceforge.net/mailarchive/message.php?msg_id=28194444 The time spent in memcpy() is probably an illusion. The data out of zlib gets copied to one row buffer where it is unfiltered (if necessary) then a copy is made in a separate buffer that is only used for the filter handling. If you test using images with large rows (I don't know what pngbench does) the copy buffer may well get flushed out of the second level cache between each row, then the memcpy will stall bringing it back in. If you have machine level profiling you may see this as a massive time spike on some probably unrelated instruction which just happens to be in the PC when the stall stops everything. Anyway, I have several ideas of how to avoid the copy when it isn't required. John Bowler <jbowler(a)acm.org> -----Original Message----- From: Glenn Randers-Pehrson [mailto:glennrp@gmail.com] Sent: Monday, October 03, 2011 1:15 PM To: PNG/MNG implementation discussion list Subject: [png-mng-implement] Use of memcpy() in libpng [Fwd from linaro-toolchain list] Re: Use of memcpy() in libpng David Gilbert Tue, 27 Sep 2011 06:20:14 -0700 On 27 September 2011 14:16, Christian Robottom Reis <k...(a)linaro.org> wrote: > On Tue, Sep 27, 2011 at 09:47:33AM +0100, Ramana Radhakrishnan wrote: >> On 26 September 2011 21:51, Michael Hope <michael.h...(a)linaro.org> wrote: >> > Saw this on the linaro-multimedia list: >> > >> > http://lists.linaro.org/pipermail/linaro-multimedia/2011-September/ >> > 000074.html >> > >> > libpng spends a significant amount of time in memcpy(). This might >> > tie in with Ramana's investigation or the unaligned access work by >> > allowing more memcpy()s to be inlined. >> >> It's the unaligned access and the change / improvements to the memcpy >> that *might* help in this case. But that ofcourse depends on the >> compiler knowing when it can do such a thing. Ofcourse what might be >> more interesting is the kind of workload analysis that Dave's done in >> the past with memcpy to know what the alignment and size of the >> buffer being copied is. > > If you guys could take a look at this there is a potential requirement > for the MMWG around libpng optimization; we could fit this in along > with other work (possible vectorizing, etc) on that component. It wouldn't take long to analyse the memcpy calls - life would be easier if we had the test program and some details on things like what size of images were used in these benchmarks. Dave

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[ACTIVITY] 3rd - 7th October

by Andrew Stubbs

Continued work on my constant reuse optimizations. Not too much this week though. I've now fixed some issues with the ARM size-costs code that was causing it to wildly over-estimate the cost of a MOVT instruction. I'll have to post this upstream sometime soon. Took another look at the shift-amount bug. Discussed the issue with Paul Brook. I've now fixed the original bug, and fixed the new bug introduced by Paul's original fix, and committed that upstream. I still need to backport it to Linaro GCC though, and the latent bug that Richard S spotted is still being analysed. Did a merge from FSF 4.5 & 4.6 to Linaro, and pushed them the Launchpad branches for testing. Begun work benchmarking different setups for the generic tuning patches. I had a lot of trouble trying to set up SPEC2000 though. Hopefully these issues are now resolved, with some help from Michael, and I have established some baseline figures on both A8 and A9 to work from. No progress on native tuning. I'm still waiting for upstream review. In other news: Mentor's contract with Linaro has now been extended for another 6 months. :)

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[ACTIVITY] 2011-10-07

by David Gilbert

== String Routines == * Built and tested a newlib with my memchr in - ready to go with a bit of tidy up. * Followed up on my eglibc patch submission by a comment suggesting the use of --with-cpu pointing back at the previous discussion. == 64 Bit atomics == * Updated gcc patch based on Ramana's comments, retested and posted new version - Lost half a day to a failing SD card in our panda. == QEMU == * Posted a patch that made one variable thread local using __thread that fixes multi threaded user mode ARM programs (e.g. firefox); this seems to have mutated on the list into a patch for more general thread local support. Dave

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[ACTIVITY] Oct 04 - Oct 07

by Ulrich Weigand

== GDB == * Reimplemented patch to disable address space randomization in gdbserver to respect the "set disable-randomization" command, and checked it in to mainline and Linaro GDB 7.3 * Worked on support for cross-platform core file generation. == GCC == * Checked in mainline fix for PR 50305. 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

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[ACTIVITY] October 2-6

by Ira Rosen

Hi, - worked on the RTL part of the widen-shift patch - backported to linaro 2/3 of the SLP patches, and proposed the third one - worked on additional SLP improvements: - swap operands to make statements isomorphic - support load with offset 1 (after load from 0) - started working on presentation for NEON forum Upcoming holidays: Oct 12, Wed - half day Oct 13, Thu Oct 16-19, Sun-Wed - half day Oct 20, Thu Ira

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[RFC ARM] Use vcvt.f32.s32 with immediate bits to do fixed to floating point conversions.

by Ramana Radhakrishnan

Hi, So one of the things Michael pointed out in today's call was that the ARM backend doesn't generate vcvt.f32.s<type> where you have an idiom conversion from fixed to floating point as in the example below. I've chosen to implement this in the following manner in the backend using these interfaces from real.c . The reason I've chosen to not allow this transformation in case flag_rounding_math is true is because this instruction always ends up rounding using round-to-nearest rather than obeying whats in the FPSCR and thus is not safe for programs that want to dynamically set their rounding modes. The benefits are quite obvious in that we eliminate a load from the constant pool and a floating point multiply and thus essentially shaving off a floating point multiply + Load latency off these sequences. This instruction can only write the output into the same register as the input register which is why I've modelled it as below by tying op1 into op0. If there's a simpler way of using the interfaces into real.c then I'm all ears ? Thoughts ? I believe such idioms are used in libav from where the original report appears to have come and thus it's a worthwhile gain where we can have it. Any other places where folks might have noticed this. I will post upstream as well once I finish testing this patch. I'm posting this here to get some feedback as well to let anyone who is really really keen about trying this out have a go given I'm out tomorrow. ( I took a quick look at the short -> f32 case as well but the fact remains that loads either zero or sign extend anyway so there's probably not much gain in modelling that right away and the win really is in getting rid of that fp mul and the constant pool load. There's probably some gain in going from i64-> f64 as well so those patterns need to be written up at some point for completeness ) cheers Ramana 2011-10-04 Ramana Radhakrishnan <ramana.radhakrishnan(a)linaro.org> * config/arm/arm.c (vfp3_const_double_for_fract_bits): Define. * config/arm/arm-protos.h (vfp3_const_double_for_fract_bits): Declare. * config/arm/constraints.md ("Dt"): New constraint. * config/arm/predicates.md (const_double_vcvt_power_of_two_reciprocal): New. * config/arm/vfp.md (*arm_combine_vcvt_f32_s32): New. (*arm_combine_vcvt_f32_u32): New. For the following testcases I see the code as follows with -mfloat-abi=hard -mfpu=vfpv3 and -mcpu=cortex-a9 float foo (int i) { float v = (float)i / (1 << 11); return v; } float foa_unsigned (unsigned int i) { float v = (float)i / (1 << 5); return v; } After patch . foo: @ args = 0, pretend = 0, frame = 0 @ frame_needed = 0, uses_anonymous_args = 0 @ link register save eliminated. fmsr s0, r0 @ int vcvt.f32.s32 s0, s0, #11 bx lr .size foo, .-foo .align 2 .global foa_unsigned .type foa_unsigned, %function foa_unsigned: @ args = 0, pretend = 0, frame = 0 @ frame_needed = 0, uses_anonymous_args = 0 @ link register save eliminated. fmsr s0, r0 @ int vcvt.f32.u32 s0, s0, #5 bx lr .size foa_unsigned, .-foa_unsigned .align 2 .global foo1 .type foo1, %function rather than .type foo, %function foo: @ args = 0, pretend = 0, frame = 0 @ frame_needed = 0, uses_anonymous_args = 0 @ link register save eliminated. fmsr s15, r0 @ int fsitos s0, s15 flds s15, .L2 fmuls s0, s0, s15 bx lr .L3: .align 2 .L2: .word 973078528 .size foo, .-foo .align 2 .global foa_unsigned .type foa_unsigned, %function foa_unsigned: @ args = 0, pretend = 0, frame = 0 @ frame_needed = 0, uses_anonymous_args = 0 @ link register save eliminated. fmsr s15, r0 @ int fuitos s0, s15 flds s15, .L5 fmuls s0, s0, s15 bx lr .L6: .align 2 .L5: .word 1023410176

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[ACTIVITY] 26th - 30th September

by Andrew Stubbs

* Vacation Monday, Tuesday, and Wednesday. * GCC Continued work on my constant reuse optimizations. Disappointingly, I've found that there are very few optimization opportunities in EEMBC (ARM/Thumb V7-A), although it's not difficult to write testcases that the optimization could improve. I also discovered that the data-flow chains don't work exactly how I thought (with respect to if-then-else cases) so I need to do a little more work. Pinged the native tuning patches; they're still waiting for upstream review. Still can't get the generic tuning work done as the CodeSourcery panda boards appear to be still offline.

15 years

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[ACTIVITY] Weekly status

by Revital Eres

Committed to mainline the patch to support instructions with auto-inc operations in SMS after addressing Ayal's comments. The patch contains two parts; one of them fixes a bug revealed during bootstrapping with the patch and SMS flags. http://gcc.gnu.org/ml/gcc-patches/2011-09/msg01988.html http://gcc.gnu.org/ml/gcc-patches/2011-09/msg01987.html Looking at estimating register pressure with SMS: based on previous discussion with Richard the current approach is to try and use the register pressure estimation in loop invariant pass.

15 years

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undefined reference to __aeabi_unwind_cpp_pr0

by AJ ONeal

I'm compiling an application built with TI's DVSDK 3 *[0]. /home/user/ti/dvsdk/dvsdk_3_01_00_10/linuxutils_2_25_02_08/packages/ti/sdo/linuxutils/cmem/lib/cmem.a470MV(cmem.o470MV):(.ARM.exidx+0x0): undefined reference to `__aeabi_unwind_cpp_pr0' arm-linux-gnueabi-gcc --version arm-linux-gnueabi-gcc (Ubuntu/Linaro 4.5.2-5ubuntu2~ppa1) 4.5.2 arm-linux-gnueabi-ld --version GNU ld (GNU Binutils for Ubuntu) 2.21.0.20110302 More full output is here (but it isn't particularly helpful due to TI's RTSC make system's black-magic) https://gist.github.com/925674 FYI: the MV in cmem.a470MV stands for MontaVista. This name is hard-coded somewhere even though it's not being linked against a MontaVista system. I believe the 470 means that it should work with ARMv4 through ARMv7, but I'm not positive. My googling suggest that this is a toolchain bug and that the best way around the issue is to create a file which defines the function as a void dummy and include it. http://www.codesourcery.com/archives/arm-gnu/msg03604.html http://comments.gmane.org/gmane.comp.boot-loaders.u-boot/78649 http://www.cs.fsu.edu/~baker/devices/lxr/http/ident?i=__aeabi_unwind_cpp_pr0 I have a script that I'll post shortly with instructions as to how to setup TI's DVSDK with Linaro AJ ONeal [0] I'm not using the latest DVSDK version 4 because the paths and such are so hard-coded for the 2009q3 version of codesourcery on ubuntu 10.04 LTS that I don't know where to start fixing it.

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[ACTIVITY] Week ending 30th September 2011.

by Ramana Radhakrishnan

===Progress=== * Patch review week. * Looked at bootstrap issue for a while but Richard Sandiford picked it up and sorted it out (Thanks Richard). * Fun and games with some paperwork. * Some backporting and testing patches. (50099 and 50186) underway. === Plans === * Clear out some of the old patches (POST_MODIFY_DISP for vfp, BRANCH_COST ) and finish on auto-inc-dec patch from last week. * Away for 1 day next week. Meetings: * 1-1s * TCWG calls Absences. * 5th October -Out of Office. * 13th - 14th October - Internal training. * 31st Oct - 4th Nov - Linaro Summit Orlando. * 08 Nov - 11 Nov - Tentatively booked * Dec 19 - 31st Dec - Tentatively booked

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[ACTIVITY] report week 39

by Peter Maydell

(short week: 3 days) RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||add-omap3-networking || 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 || || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || 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 || ||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 || == a15-usermode-support == * completed the implementation and testing of fused-mac instructions; posted patch series with these and udiv/sdiv == other == * lightning talk for pdsw doughnut session Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Applied patch for doing NEON high/low extraction using subregs. Ramana pointed out that we do the same thing for insertion, so I wrote a patch to handle that too. Both now merged into Linaro sources. * Looked at ARM bootstrap problem on trunk. Turned out to be an aliasing problem. Submitted and applied patch. * Reworked part of my SMS register-scheduling patch after feedback from Ayal. Submitted new version upstream. * Got SPEC2006 running on the powerpc boxes and tested one part of my -fsched-pressure patch. Bit of a mixed bag. h264ref was one of the worst sufferers, which was a bit worrying. I think I'll need to make a third change too. To recap, there are two pieces now: 1) Make -fsched-pressure honour the DFA 2) Make -fsched-pressure allow values that are live across a loop to be spilled. I naively hoped that (1) would be OK on its own, but h264 shows that the current -fsched-pressure code is very conservative when it comes to large blocks. It only considers register deaths once there is a single remaining use; if there are two unscheduled uses, it assumes that the register remains live for the rest of the block. So the problem that (1) was fixing was that -fsched-pressure was too optimistic in terms of what it could schedule in a cycle. But with that fixed, we seem to have too many sources of pessimism... Richard

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[ACTIVITY] Sep 26 - Sep 30

by Ulrich Weigand

== GDB == * Worked on support for cross-platform core file generation. * Followed up on patch to support disabling address space randomization in gdbserver. == GCC == * Followed up on patch for PR 50305. 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

15 years

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[ACTIVITY] w39

by Asa Sandahl

* Working on croos-compiling Firefox. Getting dependencies in place and setting up the configuration file (.mozconfig). I have had the strategy to fix one dependency at a time, picking prebuilt packages or building my self. Michael told me at yesterday's meeting about multistrap, that could possibly be used for fixing all dependencies at once. I will look into that next week. * During this process I have also spent some time reading up on cross compilation in general and also on autoconf and the GNU build system. Best Regards Åsa

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[ACTIVITY] 2011-09-28

by David Gilbert

== String routines == * Got eglibc testing setup happy at last - Note that -O3 builds generally seem to give a few more errors that are probably worth looking at - -march=armv6 -mthumb hit some non-thumb1 instructions (normally non-lo registers), again worth looking at - Cross testing to Qemu user mode often stalls, mostly on nptl tests that abort/fail when run in system/natively * Sent new version of eglibc/memchr patch upstream * Now have working newlib test setup and reference set - next step is to try adding my memchr there == Other == * Testing a QEmu patch with Peter * Looking at bug 861296 (difference in mmap layouts) * Adding a few suggestions to the set of cpu hotplug tests. * Dealing with the Manchester lab cold. Short week; back on Monday Dave

15 years

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[ACTIVITY] September 25-28

by Ira Rosen

Hi, * change default vector size patch - merged to linaro-gcc * SLP improvements committed upstream: - allow not affine accesses - auto-detect vector size - support multiple types and promotion/demotion operations Ira

15 years

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[ACTIVITY] Sep 19 - Sep 23

by Ulrich Weigand

== GDB == * Committed hardware watchpoint support for gdbserver to mainline, including two minor changes resulting from review comments; backported those fixes to Linaro GDB as well. * Implemented and tested support for disabling address space randomization in gdbserver; patch posted for review. * Investigated support for cross-platform core file generation. == GCC == * Patch review week. * Posted updated patch for PR 50305. 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

15 years

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Re: try_to_freeze() called with IRQs disabled on ARM

by Ulrich Weigand

Arnd Bergmann <arnd(a)arndb.de> wrote on 08/26/2011 04:44:26 PM: > On Thursday 25 August 2011, Russell King - ARM Linux wrote: > > > > Arnd, can you test this to make sure your gdb test case still works, and > > Mark, can you test this to make sure it fixes your problem please? > > Hi Russell, > > The patch in question was not actually from me but from Ulrich Weigand, > so he's probably the right person to test your patch. > I'm forwarding it in full to Uli for reference. Hi Arnd, hi Russell, sorry for the late reply, I've just returned from vacation today ... I've not yet run the test, but just from reading through the patch it seems that this will at least partially re-introduce the problem my original patch was trying to fix. The situation here is about GDB performing an "inferior function call", e.g. via the GDB "call" command. To do so, GDB will: 0. [ Have gotten control of the target process via some ptrace intercept previously, and then ... ] 1. Save the register state 2. Create a dummy frame on the stack and set up registers (PC, SP, argument registers, ...) as appropriate for a function call 3. Restart via PTRACE_CONTINUE [ ... at this point, the target process runs the function until it returns to a breakpoint instruction and GDB gets control again via another ptrace intercept ... ] 4. Restore the register state saved in [1.] 5. At some later point, continue the target process [at its original location] with PTRACE_CONTINUE The problem now occurs if at point [0.] the target process just happened to be blocked in a restartable system call. For this sequence to then work as expected, two things have to happen: - at point [3.], the kernel must *not* attempt to restart a system call, even though it thinks we're stopped in a restartable system call - at point [5.], the kernel now *must* restart the originally interrupted system call, even though it thinks we're stopped at some breakpoint, and not within a system call My patch achieved both these goals, while it would seem your patch only solves the first issue, not the second one. In fact, since any interaction with ptrace will always cause the TIF_SYS_RESTART flag to be *reset*, and there is no way at all to *set* it, there doesn't appear to be any way for GDB to achive that second goal. [ With my patch, that second goal was implicitly achieved by the fact that at [1.] GDB would save a register state that already corresponds to the way things should be for restarting the system call. When that register set is then restored in [4.], restart just happens automatically without any further kernel intervention. ] One way to fix this might be to make the TIF_SYS_RESTART flag itself visible to ptrace, so the GDB could save/restore it along with the rest of the register set; this would be similar to how that problem is handled on other platforms. However, there doesn't appear to be an obvious place for the flag in the ptrace register set ... Bye, Ulrich

15 years

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Use of memcpy() in libpng

by Michael Hope

Saw this on the linaro-multimedia list: http://lists.linaro.org/pipermail/linaro-multimedia/2011-September/000074.h… libpng spends a significant amount of time in memcpy(). This might tie in with Ramana's investigation or the unaligned access work by allowing more memcpy()s to be inlined. -- Michael

15 years

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[ACTIVITY] Weekly status

by Revital Eres

Debugging the new version of the patch to support instructions with REG_INC_NOTE in SMS which caused bootstrap failure. (http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html) A fix was tested and submitted: [PATCH, SMS 1/2] Avoid generating redundant reg-moves http://gcc.gnu.org/ml/gcc-patches/2011-09/msg01549.html [PATCH, SMS 2/2] Support instructions with REG_INC_NOTE (second try) http://gcc.gnu.org/ml/gcc-patches/2011-09/msg01550.html Continued looking at Richard's libav micro-bench wrt the register pressure. Richard pointed on some kernels that can serve as a testcases. Participated in non linaro activities.

15 years

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[ACTIVITY] 2011-09-23

by David Gilbert

== String routines == * Having got agreement on ignoring the triplet for picking the routine, I'm just testing a patch, but fighting a qemu setup. * Found the binfmt binding for armeb was wrong (runs the le version); filed bug with fix in Dave

15 years, 1 month

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[Activity] Week ending 23/09/2011

by Ramana Radhakrishnan

==GCC== Combined report for last 2 weeks - ===Progress=== * Committed conditional compares patch to Linaro GCC 4.6 * Looking at modelling auto-inc-decs better . * Tried patch for PR19599 and that broke bootstrap with a segfault. Needs some re-engineering. * Looked at the latest bootstrap failure on trunk. Still narrowing down. * Some work on some administrative stuff * Bit of patch review. * Went for LLVM dev meeting. * Release week had a few issues and helped dry-run cbuild spawns of jobs and think I now know how to do that. === Plans === * finish looking at bootstrap failure. * Finish auto-inc-dec patch. * some more patch review. * Send out LLVM dev meeting report. Absences. * 5th October - Out of office. * 13th -14th October - Internal ARM training. * 31st Oct - 4th Nov - Linaro Summit Orlando * 08 Nov - 11 Nov - Tentatively booked * Dec 19 - 31st Dec - Tentatively booked

15 years, 1 month

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[ACTIVITY] report week 38

by Peter Maydell

(short week: 4 days) RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||add-omap3-networking || 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 || || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || 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 || ||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 || == a15-system-mode-planning == * now complete: we have generated blueprints/roadmap cards for the TSC for the various options == a15-usermode-support == * tested udiv/sdiv implementation * fused mac: rough idea of what needs to be done, need to get all the fiddly details right == omap3 upstreaming == * rebased and sent pullreq for various outstanding patches == other == * code/design walkthrough for upstream's new memoryregion API * working on lightning talk for pdsw doughnut session next week * investigated compile failure building QEMU in thumb mode with debug enabled (we're trying to use the Thumb framepointer register as a temporary...) * meetings: toolchain, standup, 1-2-1 Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences (to end of year): Sep 29-Oct 07, Oct 17, Nov 21, Dec 15-Jan 03: leave Oct 30-Nov 04: Linaro Connect Q4.11

15 years, 1 month

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Submitted a fix for the performance regression caused by my arm_comparison_operator patch. Applied upstream after approval from Ramana (thanks). Will backport to Linaro towards the end of next week if there are no reported problems. * Went back to looking at -fsched-pressure. To recap, a colleague ran SPEC for s390 comparing: (a) normal -O3 based flags (b) (a) + -fsched-pressure without my patch (c) (a) + -fsched-pressure with my patch (c) got the best geomean result, but there were some individual tests for which (b) was significantly worse than (a), and for which (c) only partly closed the gap. Found one problem. It looks like -fsched-pressure only really operates on the issue rate and instruction latencies; it doesn't seem to use the DFA. This seems to be unintentional, and fixing it showed some nice results. Also, the -fsched-pressure patch that I wrote at Connect set the starting pressure based on the set of registers that are both live on entry to the block _and_ used within the enclosing loop, This still seems to be a bit too conservative, in that it makes the scheduler go out of its way to preserve loop invariants, even if there are too many of them. Experimented with changing "used" to "defined". This too seemed to be a win. * Got access to some PowerPC GNU/Linux machines that are suitable for running SPEC. Set up my account there and got SPEC building. The idea is to use this to get more cross-target evidence for the -fsched-pressure submission(s). * Discussion about the SMS register-scheduling patches after great feedback from Ayal. While drafting a still-unsent reply justifying the main part of the patch, I found I was also explaining why another part of the patch (specifically the prologue/epilogue part) was wrong. Thought about that a bit today. * Submitted fix for LP 641126. == Next week == * More SMS register scheduling. * More -fsched-pressure. * Hopefully remerge the arm_comparison_operator patch with this week's fix. Richard

15 years, 1 month

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[ACTIVITY] w38

by Asa Sandahl

* Working on getting everything in place for cross-compiling Firefox for ARM. Trying to understand how the configuration script and make file works. * Working on a test that will run Sunspider and extract the results. The challenging part is that results are only presented on the page, not e.g. written to stdout or to file. My approach to create an html file, embed the page with the test in an iframe, and read out the results when the test is done. * Running SPEC2K on the Snowball board. An updated kernel solved the issue with great variations in the test results. Some tests results look a bit strange, so I will look at what those tests do to see what part of the system is stressed. Best Regards Åsa

15 years, 1 month

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[ACTIVITY] September 18-22

by Ira Rosen

Hi, * widening shifts patch - submitted upstream * change default vector size patch - submitted to linaro-gcc * automatic choice of vector size for basic block vectorization - testing * vectorizer bug fixes Next week we have New Year holiday on Wednesday (half day) and Thursday. Ira

15 years, 1 month

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Linaro GCC 4.6 and 4.5 2011.09 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2011.09 release of both Linaro GCC 4.6 and Linaro GCC 4.5. Linaro GCC 4.6 2011.09-1 is the seventh release in the 4.6 series. Based off the latest GCC 4.6.1+svn178681, it contains a range of vectoriser and core performance improvements as well as fixing a number of bugs. Interesting changes include: * Updates to 4.6.1+svn178681 * Improves performance by making better use of conditional compares * Improves performance by properly scheduling widening multiplies * Improves size and speed by improving constant generation in Thumb-2 * Implements support for widening multiples in toe core * Improves vectorised code by reducing the over-promotion of intermediates * Improves performance by reducing redundant moves between VFP and ARM * Finishes off supporting the Android team in integrating Linaro GCC Fixes: * LP: #823548 Can't use -flto with skia * LP: #823711 libvirt version 0.9.2-4ubuntu8 failed to build on armel * LP: #827990 internal compiler error: in decode_addr_const, at varasm.c:2632 * LP: #836401 ICE on a | (b << negative-constant) * LP: #838994 ICE building perl w/ -marm * LP: #843775 ICE optimizing widening multiply-and-accumulate Linaro GCC 4.5 2011.09 is the fourteenth release in the 4.5 series. Based off the latest GCC 4.5.3+svn178560, this is a maintenance focused release. Interesting changes in 4.5 include: * Updates to 4.5.3+svn178560 Fixes: * LP: #823711 libvirt version 0.9.2-4ubuntu8 failed to build on armel The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.6-2011.09 https://launchpad.net/gcc-linaro/+milestone/4.5-2011.09 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro More information on the features and issues are available from the release page: https://launchpad.net/gcc-linaro/4.6/4.6-2011.09 https://launchpad.net/gcc-linaro/4.5/4.5-2011.09 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

15 years, 1 month

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Bootstrapping GCC in PGO, LTO, and SMS modes

by Michael Hope

I tried to bootstrap current GCC trunk and our latest gcc-linaro-4.6 in profile guided, link time optimisation, and SMS modes. The results are here: https://wiki.linaro.org/MichaelHope/Sandbox/PGOLTOSMSStatus1 Short story: you can't bootstrap in LTO or PGO on ARM as they run out of memory. i686 LTO is broken on trunk and gcc-linaro-4.6. SMS is fine in general. I'll run these once a week and keep an eye on them. A -fwhopr instead of -flto may help on ARM. I don't know why the PGO build runs out of memory. -- Michael

15 years, 1 month

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libav IDCT speed tests

by Michael Hope

Måns pointed me at the IDCT throughput test that's included with libav. I've written up a page on how to build and run it at: https://wiki.linaro.org/MichaelHope/Sandbox/LibAvDCT Included are results with and without the vectoriser. In all cases the vectoriser improves things, including increasing the SIMPLE-C version by 11 % and the peak by 17 %. The coefficient of variance is low so the results are consistent. I haven't investigated the benchmark itself to see if its valid - we could be vectorising the loop overhead instead of the IDCT itself. -- Michael

15 years, 1 month

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Implicit-it upstream discussion.

by Andrew Stubbs

Hi Michael, Here's the gcc-patches@ discussion you asked for: http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01339.html http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01351.html http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01353.html http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01354.html http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01355.html http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01356.html http://gcc.gnu.org/ml/gcc-patches/2010-07/msg01357.html Andrew

15 years, 1 month

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Re: eglibc and fun with config.sub

by Michael K. Edwards

Please coordinate with Jon Masters at RedHat/Fedora and Adam Conrad at Ubuntu/Debian on this. (Cc'ing the cross-distro list, through which the recent ARM summit at Linux Plumbers was organized.) Cheers, - Michael On Sep 16, 2011 8:41 AM, "David Gilbert" <david.gilbert(a)linaro.org> wrote: > OK, so we seem to have agreement here that what we want is autodetect > for eglibc and > forget about the triplet; well technically that probably makes my life > easier, and I don't > think it's too hard a sell. > > Dave > > _______________________________________________ > linaro-toolchain mailing list > linaro-toolchain(a)lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-toolchain

15 years, 1 month

3
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[ACTIVITY] 12th - 17th September

by Andrew Stubbs

* Linaro GCC Spun 4.5 and 4.6 2011.09 GCC release tarballs. Uploaded them to Michael's server, and kicked off the tests. Continued work on my new constant optimization experiments. I now have it tracking all the constants and am looking at how to detect the optimization opportunities. So far it only calculates how exprensive it would be to generate a value by adding to an existing constant, which is a start at least. I'm having difficulties detecting whether changing an insn will make it's parent (dependency-wise) obsolete, or not (and therefore whether to count its costs - there's no problem for instructions that overwrite an entire register, but ones that write to portions of registers (such as MOVT) make more complex dependency chains, and the def-use chains don't seem to be sorted into the order of use. * Other Half day vacation on Thursday.

15 years, 1 month

1
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gcc segfaults when building v8 (nodejs)

by AJ ONeal

Using the Linaro prebuilt package from a few days ago I got a segfault in gcc that is not manifest in a version from a few months earlier. Details are here: https://gist.github.com/1223209 A small snippet: g++ -o obj/release/jsregexp.o -c -fno-rtti -fno-exceptions -Wall -W -Wno-unused-parameter -Wnon-virtual-dtor -Wno-abi -pedantic -mfloat-abi=softfp -O3 -fomit-frame-pointer -fdata-sections -ffunction-sections -ansi -fno-strict-aliasing -DCAN_USE_VFP_INSTRUCTIONS -DUSE_EABI_HARDFLOAT=0 -DV8_TARGET_ARCH_ARM -DENABLE_DEBUGGER_SUPPORT -I/home/user/Code/node/deps/v8/src /home/user/Code/node/deps/v8/src/jsregexp.cc g++: Internal error: Segmentation fault (program as) Please submit a full bug report. See <file:///usr/share/doc/gcc-4.5/README.Bugs> for instructions. scons: *** [obj/release/jsregexp.o] Error 1 scons: building terminated because of errors. Waf: Leaving directory `/home/user/Code/node/out' Build failed: -> task failed (err #2): {task: libv8.a SConstruct -> libv8.a} make: *** [program] Error 1 user@linaro-developer:~/Code/node$ uname -a Linux linaro-developer 3.0.0-1004-linaro-omap #5~ppa~natty-Ubuntu SMP PREEMPT Mon Aug 22 08:44:20 UTC 2011 armv7l armv7l armv7l GNU/Linux user@linaro-developer:~/Code/node$ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/arm-linux-gnueabi/gcc/arm-linux-gnueabi/4.5.2/lto-wrapper Target: arm-linux-gnueabi Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.5.2-8ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.5 --enable-shared --enable-multiarch --with-multiarch-defaults=arm-linux-gnueabi --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib/arm-linux-gnueabi --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib/arm-linux-gnueabi --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin --enable-gold --enable-ld=default --with-plugin-ld=ld.gold --enable-objc-gc --disable-sjlj-exceptions --with-arch=armv7-a --with-float=softfp --with-fpu=vfpv3-d16 --with-mode=thumb --disable-werror --enable-checking=release --build=arm-linux-gnueabi --host=arm-linux-gnueabi --target=arm-linux-gnueabi Thread model: posix gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) AJ ONeal

15 years, 1 month

2
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[ACTIVITY] Weekly status

by Revital Eres

* Added testcases to Richard's micro benchmarks taken from libav. * Discussed with Ayal the new version of the patch to support instructions with REG_INC_NOTE in SMS which causes bootstrap failure. I intend to debug the bootstrap failure in order to find the cause for it. (http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html)

15 years, 1 month

1
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