- linaro-toolchain - lists.linaro.org

by Andrew Stubbs

* Linaro Continued trying to understand lower-subreg and its impact on ARM optimization. After much staring at RTL dumps and trying to minimize test cases from large code bases I've not found an example of code where disabling the lowering of pseudo-to-pseudo copies made the code larger for anything other than unfortunate random knock-on effects (such as no longer being able to use 16-bit thumb1 opcodes). I posted a message to this effect on the gcc list, and I'll try benchmarking a patch for this next week. In the process of looking at lower-subreg, discovered a silly missed-optimization bug with many DImode operations, and reported it to GCC Bugzilla as pr53189.

13 years, 5 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded-Core/meta-linaro: * created meta-linaro denzil branch to be used in conjunction with the oe release * added a patch that prevents GCC from installing libssp and libstdc++-v3 to lib64 on X86_64 Linux * merged patches that use vexpress defconfig only for qemuarmv7a * built and tested all supported QEMU tarted (ARM, MIPS, PPC, X86, X86_64) using Linaro GCC 4.6 2012.04 * All images (minimal, sato and Qt) are booting! * started to work on the automation Regards, Ken

13 years, 5 months

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[Activity] Week 18

by Zhenqiang Chen

Summary: * arm-linux-gnueabihf and multilib support for linaro toolchain. * Code size benchmark analysis. Details: 1. arm-linux-gnueabihf support for linaro toolchain * Update gcc, libgcc and libstdc++ config to support the triplet. * Update build scripts to gnueabihf. * Add sample config for gnueabihf. 2. Multilib support for linaro toolchain * Merge Terry's multilib patches (http://gcc.gnu.org/ml/gcc-patches/2012-04/msg00975.html http://gcc.gnu.org/ml/gcc-patches/2012-05/msg00083.html) and revise them for linaro. * Update gcc.c and incpath.c to make multiarch and multilib work together. * libgcc for armv4t (-mfloat-abi=soft) build fail: ld: error: armv4t/libgcc_s.so.1.tmp uses VFP register arguments, ... does not. Root cause: crt*.o from precise sysroot use VFP_args, while other objects are built with -mfloat-abi=soft. We need additional crt*.o to build libgcc for armv4t. 3. Code size regression analysis We find more regression cases introduced by ivopt and loop invariant. Plans: * Investigate other code size regressions in 4.7. * Finalize the arm-linux-gnueabihf and multilib support for linaro toolchain. Best regards! -Zhenqiang

13 years, 5 months

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Manual tracking of benchmark builds

by Michael Hope

I've lost track of the benchmark builds so I've started a manual todo list at: https://wiki.linaro.org/MichaelHope/Sandbox/Todo It's been messy with the validation lab being down and some builds being in my home office and some in Cambridge. Let me know if I'm missing any. -- Michael

13 years, 5 months

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Bumping the meeting to Tuesday

by Michael Hope

Hi there. Let's bump the Monday meeting to Tuesday due to the UK bank holiday. I'll update the invite, -- Michael

13 years, 5 months

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Armhf dynamic linker path

by Steve McIntyre

Hi folks, We really need to push on with getting the loader path for armhf standardised. The path that was agreed months ago is /lib/arm-linux-gnueabihf/ld-linux.so.3 but clearly not everybody is using that yet. Dann has just posted an updated patch for gcc, and we want to get this reviewed / fixed up / accepted ASAP. Then we may need to backport it to older gcc releases. This is *important* so that we can help vendors release binaries that work on any hard-float distribution. For people who have made binaries that still use the old, broken location /lib/ld-linux.so.3, we can put symlinks in place *for now* but in the longer term as many distros switch to multi-arch the symlink is not an acceptable solution. I'm working on a more complete spec document for armhf to help us with this kind of thing, but it's not going as smoothly as I'd hoped and I don't want to wait for that as a blocker on the linker path. Cheers, -- Steve McIntyre steve.mcintyre(a)linaro.org <http://www.linaro.org/> Linaro.org | Open source software for ARM SoCs

13 years, 5 months

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[ACTIVITY] report week 18

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-06-23 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04 || 2012-02-01 || == other == * cleaned up and refactored QEMU GIC/NVIC code enough to provide a solid foundation for the in-kernel irqchip support. Posted the refactoring bits to qemu-devel. This should be enough to unblock Marc Z. * qemu-linaro: LP:978694: added patch from Peter Chubb fixing beagle bootrom FAT12/FAT16 handling * finished a trivial bit of cleanup of an omap3 ID register patch I'd had lying around half-done for a while * investigating a bug reported by Alex Graf where we get a segfault gtk-query-immodules-2.0 but only if qemu's 'reserve memory space' feature is being used: this appears to be an interestingly nasty case where if the guest does mmap(dll); execute code in dll; munmap(); mmap(dll 2); execute code in dll 2; and the two mmap()s happened to pick the same address then we will end up using a stale cached translation from dll 1 when executing dll 2... -- PMM

13 years, 5 months

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[ACTIVITY] Apr 30 - May 04

by Ulrich Weigand

== GCC == * Completed testing and benchmarking of patch to use vld1/vstd1 instead of vldm/vstdm for vector moves. Saw no regressions but only minor benefits. * Checked in patch to fix LP #959242 (GCC PR tree-optimization/52633) to FSF mainline and 4.7 branch; backports to Linaro GCC 4.7 and 4.6 pending. * Checked in mainline patch to enable -fsched-pressure by default on s390. * Ongoing work on improving end-of-loop value computation. * Started investigation of TSVC vectorizer test kernels. 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

13 years, 5 months

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Vectorization paper / kernels.

by Ramana Radhakrishnan

Hi Uli, While looking into something else I ran into these - I wonder how many of these GCC manages to vectorize ... http://www.netlib.org/benchmark/livermorec . These look interesting from a vectorizer kernels point of view. The other interesting paper of note was this PACT paper on vectorization benchmarks comparing icc , xlc and GCC which might provide some interesting hints / reading. http://polaris.cs.uiuc.edu/~garzaran/doc/pact11.pdf . The appropriate benchmarks kernels are linked to below. http://polaris.cs.uiuc.edu/ ̃maleki1/TSVC.tar.gz. regards, Ramana

13 years, 5 months

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Agenda for 2012-05-07

by Michael Hope

I've put the agenda for Monday's call at: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-05-07 which is: * Review action items from last meeting * Connect sessions: * GDB for Android * GCC performance call - Live! * KVM performance * Renderscript * Android benchmarking * Dalvik improvements * Hard float switchover status * multiarch upstreaming * Next week is release week * vld1, EEMBC results, and noise * twolf result variance * KVM minimum features * UP/UP, Ubuntu * [[MichaelHope/Sandbox/KVMUseCase]] Feel free to edit, -- Michael

13 years, 5 months

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Simpler benchmark comparison

by Michael Hope

I've made a couple of changes to the processing of benchmark results. The server now automatically tabulates the raw results like: http://ex.seabright.co.nz/benchmarks/gcc-linaro-4.7+bzr114974/logs/armv7l-n… diffbench[1] can now take a URL instead of a local file such as: python diffbench.py \ http://ex.seabright.co.nz/benchmarks/gcc-linaro-4.7+bzr114974/logs/armv7l-n… \ http://ex.seabright.co.nz/benchmarks/gcc-linaro-4.7+bzr114977~uweigand~mov-… You'll need to put the username and password from https://wiki.linaro.org/Internal/ToolChain into ~/.netrc to authenticate. diffbench now tries to pull a readable name from the results to make the results easier to understand. Running the above command now shows: Significant differences ----------------------- * bzr114977 scored xx.yy % (t=38.9) against bzr114974 on popular embedded benchmark rgbcmykv2data3 ... All other results ----------------- ======== ============== ========= ========= ======================== testname subname bzr114974 bzr114977 improvement in bzr114977 ======== ============== ========= ========= ======================== coremark 2xxx.096 2xxx.653 100.0 ... -- Michael [1] http://code.launchpad.net/linaro-toolchain-benchmarks scripts/diffbench.py

13 years, 5 months

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Updates to the BzrTips wiki page

by Michael Hope

I've done some minor updates to the instructions for working with gcc-linaro, bzr, and merge requests at: https://wiki.linaro.org/WorkingGroups/ToolChain/BzrTips The interesting changes are using: * bzr commit --fixes=lp:nnnn to link a branch to a bug number * bzr branch --hardlink to cut down on branch time and disk usage * bzr-merge-changelog to automatically merge ChangeLog.linaro -- Michael

13 years, 5 months

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Building BusyBox with 4.6.3 TC

by Dan Donahue

Greetings, I successfully built BusyBox using the 4.5.2 toolchain. When I try to build BusyBox using the same config with the 4.6.3 toolchain I get the following error: The Linaro 4.5.2 toolchain was installed in my Ubuntu 11.04 distro using aptitude. The Linaro 4.6.3 toolchain binaries, downloaded via Launchpad, were installed into my own tools directory. busybox # make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- scripts/kconfig/conf -s Config.in can't find file Config.in make[2]: *** [silentoldconfig] Error 1 make[1]: *** [silentoldconfig] Error 2 make: *** [include/autoconf.h] Error 2 I get the same error if I try 'make oldconfig' or 'make menuconfig'. Is there a PATH I need to set? Am I missing a package? Right now my PATH has following 4.6.3 directories set: linaro-4.6.3/bin linaro-4.6.3/arm-linux-gnueabi/libc/usr/include linaro-4.6.3/arm-linux-gnueabi/libc/lib/arm-linux-gnueabi linaro-4.6.3/arm-linux-gnueabi/libc/usr/include Thanks, Dan

13 years, 6 months

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Update on SPEC result noise

by Michael Hope

I thought I'd send an update on the SPEC 2000 twolf variance. We're seeing a high amount of variance in the results for the SPEC 2000 twolf, vpr, and galgel benchmarks. I've run tests on a PandaBoard, Origen, and IGEPv2 and gotten a coefficent of variance of 0.014, 0.017, and 0.003 which suggests that the problem is Cortex-A9 specific. twolf is hard on the cache so my theory is that it's something to do with the memory subsystem. I currently have a PandaBoard running with SMP, heap randomisation, virtual address randomisation, and the branch predictor off and the CPU down clocked to the non-overdrive 600 MHz. I'll let this run overnight and see if the results are tighter. To solve Andrew's immediate problem, I'm running SPEC on the 64 bit core register shifts on the OMAP3. The results are tight enough that we should be able to show any regressions. -- Michael

13 years, 6 months

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Precise sysroots available

by Marcin Juszkiewicz

I added Ubuntu 12.04 'precise' based sysroots to Jenkins yesterday. They are built using 'armhf' architecture and available in three flavours: - alip - nano - ubuntu-desktop So far only -dev ones are present, will work on -dbg ones soon. We have 'nano' one built and available to fetch at http://snapshots.linaro.org/precise/images/nano-dev/ - rest will be built when there will be machine free to do that. They will also be moved to http://snapshots.linaro.org/precise/sysroots/ to not make people try to boot them ;) Please take a look do they work as you want and tell me what kind of changes you would like to have, which images are not needed, which should be added. Are there any users for -dbg style sysroots?

13 years, 6 months

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MULTILIB_DEFAULTS need an update for ARM multilib builds

by Matthias Klose

I did see gcc-4.7 fail to build for an sf/hf multilib configuration. The reason was that gcc -print-multi-directory didn't print anything for the non-default, and gcc -print-multi-lib only prints `.'. The reason is that set_multilib_dir in gcc.c only consults MULTILIB_DEFAULTS (only defined in linux-elf.h), but not the default configure options in configargs.h. This proposed patch updates MULTILIB_DEFAULTS depending on the configure options. An alternative approach would be to update set_multilib_dir and print_multilib_info to lookup the configure_default_options in configargs.h as well. Note that this didn't fail to build in gcc-4.6, but I can't see yet what change did cause the build failure. Matthias

13 years, 6 months

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[ACTIVITY] 23rd - 27th April

by Andrew Stubbs

* Linaro Continued looking at the lower-subreg problem (that the lowering is only really intended for 32-bit targets that don't have 64-bit operation). Without NEON this is only really a problem for "ldrd/strd" 64-bit loads and stores: the patterns are all (or should be all) written such that they only access DImode regs via SUBREG, so it all works well. When adding NEON 64-bit this becomes less clear: many operations must remain in DImode without SUBREG until after register allocation. The lower-subreg passes mostly cope with this well enough, but it has some features that attempt to lower zero_extends, certain shifts, and pseudo-reg copies, unconditionally. I've been investigating what happens if I disable the pseudo-reg copy "optimization" in the first lower-subreg pass. As I expected, in many cases it actually leads to smaller code (more use of LDRD/STRD) without NEON, and even better results with NEON. Unfortunately I have found so counter-examples, so I'm trying to figure out what's going on there: for some reason reload goes crazy and starts spilling things to the stack, even though I can't see that more registers are required. More investigation required. Richard E approved my NEON-immediates patch for upstream. I don't have time to commit it with proper care this week, so that's delayed to next week. * Other Vacation Monday and Tuesday. Had a fun long weekend in Cornwall with my family.

13 years, 6 months

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[Activity] week 17.

by Ramana Radhakrishnan

Progress Away last week - nothing to report. Will be in BST + 4:30 timezone this week. Plans * Finish off the VFP addressing modes patch. * Follow up on iterations idiom patch upstream * Pursue backporting gnu_unique_object upstream. * Look at some of the existing blueprints and start discussions around prioritizing this. * Investigate some of the SEGVs with h-c partitioning in the future.

13 years, 6 months

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Precise and hard float for the next binaries release

by Michael Hope

Hi Zhenqiang. Ubuntu Precise is now out and has switched to hard float by default. I want to do the same for the next binaries release. Here's the work that needs to be done: * Bring in the new sysroot * Change the triplet to arm-linux-gnueabihf * Change GCC's configure so it recognises the new triplet * Change the default float ABI to hard We should include a soft float (not softfp) multlib libgcc for those who use the binary toolchain to build bare metal programs like u-boot or the kernel. They don't use floating point, but the linker will complain about mixed calling conventions. I've updated make-sysroot.sh and spun an experimental sysroot at http://people.linaro.org/~michaelh/incoming/precise-sysroot-armhf-r0.tar.bz2. Hopefully we'll use Marcin's ones instead. Matthias has patches for many of these changes. Let's talk about it at tonight's meeting. Could you start on these? I'd like the changes done within two weeks so we have plenty of time to test. -- Michael

13 years, 6 months

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[Activity] Week 17

by Zhenqiang Chen

Summary: * Linaro binary toolchain 2012.04 release. * Code size benchmark analysis. Details: 1. Validate and bug fix for linaro binary toolchain 2012.04 release. 2. Investigate code size regressions in 4.7 Find more regression cases due to loop invariant hoisting, and tests should we can reduce some codesize with option -fno-move-loop-invariants. Some regressions are due to pass_reorder_blocks, which is disabled for -Os in 4.7. For some cases, ivopt will introduce to more codes and function inline might lead to more spilling. We also try linaro 2012.04 baremetal build. But there is a few bytes regression compared with 4.7 trunk. 3. Setup the qemu env following Michael’s instructions (https://wiki.linaro.org/MichaelHope/Sandbox/QEMUCrossTest) and tests show it work. 4. Try to build gcc-linaro-2012.04 configured with "--with-fpu=neon --with-float=hard" based on a precise sysroot (precise-sysroot-armhf-r0.tar.bz2) from http://people.linaro.org/~michaelh/incoming * Linux build is OK without any change. * Mingw32 build reports error. After removing the code, the build PASS. [ERROR] .../libc/usr/include/arm-linux-gnueabihf/sys/types.h:117:19: error: two or more data types in declaration specifiers Plans: * Investigate other code size regressions in 4.7. Planed leaves: * Labor Day holiday: April 30 and May 1. Best regards! -Zhenqiang

13 years, 6 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded-Core/meta-linaro: * pushed support for Linaro GCC 4.6.4 2012.04 and for the 2012.03-20120326 binary toolchain * updated the wiki * created a branch to support GCC 4.7 * built several images using several GCC 4.7 based toolchains (OE, linaro 4.7.1, binary toolchain 2012-04) * minimal images are working * sato image shows splash screen forever (won't bring up the matchbox window manager) * only when using the binary toolchain 2012-04 ? -> needs to be analyzed * Qt 4.8 requires small patches (posted and merged into oe-core/master-next) Libunwind: * User reports issues when backtracing through signal frame * reason: the lib falls back on APCS frame parsing which usually segfaults on EABI systems * provided debugging hints and insights on how libunwind handles signal frames * posted a reduced testcase Regards, Ken

13 years, 6 months

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[ACTIVITY] Apr 23 - Apr 27

by Ulrich Weigand

== GCC == * Fixed regression (ICE when building EEMBC) with patch to use vld1/vstd1 instead of vldm/vstdm for vector moves. Updated merge request and restarted testing. * Implemented patch to fix LP #959242; backported to Linaro GCC 4.7 and created merge request for regression testing and benchmarking. * Ongoing discussions on -fsched-pressure; worked on patch to enable it by default on s390. * Ongoing work on improving end-of-loop value computation. 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

13 years, 6 months

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[ACTIVITY] report week 17

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-06-23 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04 || 2012-02-01 || == cp15-rework == * have had no review feedback on this patchset yet, and we're now into QEMU 1.1 hardfreeze. I'm hoping to get review during the month we're in freeze and then commit early June when 1.2 opens. However since that coincides with me being on holiday I've set the Estimate date to allow for that plus a week or so of buffer. Actual further work required is probably 1 week max, most of this is waiting-for-other-people or being-away. == kvm-boot-wrapper == * pushed dtb support changes to git repo == other == * basic QEMU side support for the VGIC kernel implementation Marc Z has been working on. I have something that seems to work but it's still a bit prototype and missing features. * investigated why my guest kernel was causing kvm to exit: turns out that we haven't implemented the kernel support for gracefully not using KVM if not booted in hyp mode, so trying to boot a KVM-aware kernel as a KVM guest doesn't work yet. * sent off the final few patches which I want in QEMU 1.1 before hardfreeze at the start of next week * tested a beagle board linaro snapshot image (it panics on bootup, LP:989737) * trying to clarify the KVM todo list... -- PMM

13 years, 6 months

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Board boots Linux built with 4.5.3 TC but not 4.6.3

by Dan Donahue

Greetings, I successfully built and booted Linux 3.1 for the beaglebone (TI am335x) using the 4.5.2 toolchain. I rebuild the same kernel using the same config with the 4.6.3 toolchain, but the board hangs at "Uncompressing Linux... done, booting the kernel." I halt the beaglebone at the U-Boot prompt and have it download and run uImage from an NFS mounted RFS. The Linaro 4.5.2 toolchain was installed in my Ubuntu 11.04 distro using aptitude. The Linaro 4.6.3 toolchain binaries, downloaded via Launchpad, were installed into my own tools directory. 4.5.2 INFO: ./gcc-linaro-arm-linux-gnueabi-2012.01-20120125_linux/bin/arm-linux-gnueabi-gcc --version arm-linux-gnueabi-gcc (crosstool-NG linaro-1.13.1-2012.01-20120125 - Linaro GCC 2012.01) 4.6.3 20120105 (prerelease) Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Built with: $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- uImage 4.6.3 INFO: ./bin/arm-linux-gnueabi-gcc --version arm-linux-gnueabi-gcc (crosstool-NG linaro-1.13.1-2012.01-20120125 - Linaro GCC 2012.01) 4.6.3 20120105 (prerelease) Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Built with: $ make ARCH=arm CROSS_COMPILE=<mytoolsdir>/gcc-linaro-arm-linux-gnueabi-2012.01-20120125_linux/bin/arm-linux-gnueabi- uImage Could it have anything to do with my binutils and/or U-Boot version? Any debugging tips? U-Boot INFO: U-Boot# version U-Boot 2011.09-00010-g81c8c79 (Feb 13 2012 - 14:48:03) arm-angstrom-linux-gnueabi-gcc (GCC) 4.5.4 20111126 (prerelease) GNU ld (GNU Binutils) 2.20.1.20100303 Thanks for reading this far.

13 years, 6 months

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Cross testing applications under QEMU

by Michael Hope

We use QEMU to test programs built by the toolchain binary release for correctness. I've written up the instructions for spinning up your own at: https://wiki.linaro.org/MichaelHope/Sandbox/QEMUCrossTest It's focused on simplicity - getting a running, SSH only Cortex-A9 up and going as soon as possible. It's not the latest, not graphical, and doesn't replace the deeper documentation at: https://wiki.linaro.org/Resources/HowTo/Qemu -- Michael

13 years, 6 months

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[ANNOUNCE] Linaro Toolchain Binaries 2012.04 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2012.04 release of the Linaro Toolchain Binaries, a pre-built version of Linaro GCC and Linaro GDB that runs on generic Linux or Windows and targets the glibc Linaro Evaluation Build. Uses include: * Cross compiling ARM applications from your laptop * Remote debugging * Build the Linux kernel for your board What's included: * Linaro GCC 4.7 2012.04 * Linaro GDB 7.4 2012.04 * A statically linked gdbserver * A system root * Manuals under share/doc/ The system root contains the basic header files and libraries to link your programs against. Interesting changes include: * Switches to the new GCC 4.7 based Linaro GCC * Adds native language support to most of the programs * Adds the mudflap, ssp, and gomp runtime libraries * Enables gnu_unique_object support in GCC Please see the README about running 4.7 based programs on a system with 4.6 based runtime libraries. The Linux version is supported on Ubuntu 10.04.3 and 11.10, Debian 6.0.2, Fedora 16, openSUSE 12.1, Red Hat Enterprise Linux Workstation 5.7 and later, and should run on any Linux Standard Base 3.0 compatible distribution. Please see the README about running on x86_64 hosts. The Windows version is supported on Windows XP Pro SP3, Windows Vista Business SP2, and Windows 7 Pro SP1. The binaries and build scripts are available from: https://launchpad.net/linaro-toolchain-binaries/trunk/20yy.mm Need help? Ask a question on https://ask.linaro.org/ Already on Launchpad? Submit a bug at https://bugs.launchpad.net/linaro-toolchain-binaries On IRC? See us on #linaro on Freenode. Other ways that you can contact us or get involved are listed at https://wiki.linaro.org/GettingInvolved. -- Michael

13 years, 6 months

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[ACTIVITY] April 16 - April 20

by Thiago Jung Bauermann

Hi, GDB for Android: * Wrote patch for bionic adding .note.ABI-tag to the crtbegin object files. Sent to Google engineers, They think it's going in the right direction and I will submit via gerrit. * Isolated Android-related changes in diff between AOSP's GDB 7.3.x and FSF GDB 7.3. There are a lot of unrelated changes there. * Sent e-mail asking for comments about the Android extension to .note.ABI-tag to the LSB and binutils mailing lists. Got only one e-mail of feedback. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 6 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * catching up with emails * rebased against current OE-core * OE is planning a release in april (following the yocto schedule) * noticed the libc of our binary toolchain is lacking i18n * caused a packaging issue for meta-linaro but easy to workaround * contents of the i18n folder are only used at runtime (not relevant for compiliation time) * updates in order to support for the 2012.03-20120326 binary toolchain * locations of sibgcc_s.so and libstdc++.so are different * added support for linaro gcc 2012.04 * looked at the meta-linaro patches made by Khem Regards, Ken

13 years, 6 months

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Fix for EEMBC build problems

by Michael Hope

The EEMBC supplied build system has a couple of bugs with library order (putting -lrt at the start of the command line instead of the end) and the harness library (depending on THOBJS but linking against THLIB). I've fixed these and pushed to our private branch. Ulrich, I've spawned builds of your vld1.64 branch and its ancestor. Once those are done I'll spawn a benchmark run against them. -- Michael

13 years, 6 months

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[Activity] Week 16

by Zhenqiang Chen

Summary: * Code size benchmark analysis. * Linaro binary toolchain 2012.04 release. Details: 1. Tuning the heuristic to assign register for copies. * Take the CONFLICT_HARD_REGS and HARD_REG_COSTS of copies into account when conflict_costs is NULL in update_conflict_hard_regno_costs, which handles the following case: a = ... ... b = a // a can be assigned with r3 or r5 which have the same min_cost. ... // b is conflicted with r3 or the cost of r3 is very high = b In this case, if a is assigned with r3, b can not be assigned with r3, so the copy "b = a" can not be optimized. When taking the CONFLICT_HARD_REGS or HARD_REG_COSTS of b into account, we can assign a with r5. 2. Linaro binary toolchain 2012.04 release. * Update gdb/TOOLCHAIN_PKGVERSION/README to 2012.04. * Test workaround localization patch to fix lp:918926. * Local build and tests show the toolchain can find the corresponding .mo file. * But if the host system does not have the corresponding font packages, it will show some mess characters. * gdb does not have gdb.mo. 3. Investigate code size regressions in 4.7. * Loop invariant hoisting might increase register pressure, which leads to much more spilling. Plans: * Finalize Linaro binary toolchain 2012.04 release * Investigate other code size regressions in 4.7. Planed leaves: * Labor Day’s holiday: April 30 and May 1. Best regards! -Zhenqiang

13 years, 6 months

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Issue with libgcc_s.so.1 location

by Felipe Contreras

Hi, I have been using CodeSourcery tool-chains since forever, and I decided to try Linaro's tool-chain. So far I haven't had any issues, except one: libgcc_s.so.1 is located in arm-linux-gnueabi/lib, which is not available from arm-linux-gnueabi/libc. The CodeSourcer tool-chain has all those files inside the 'libc' directory, which is useful for Scratchbox2, because you need to specify a "target root" which is basically the libc directory which acts in a similar fashion to /. I've managed to create a rule to workaround this issue, but I wonder why are those files in that location, why not in 'libc/lib'? Cheers. -- Felipe Contreras

13 years, 6 months

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[Activity] Week 15 / 16

by Ramana Radhakrishnan

=== Progress === * Worked on the VFP addressing modes patch upstream. Handled most comments. Final version has finished testing and looks almost ready to commit. * Investigated an issue with min type transformations for loop terminating conditions. Wrote up a small patch which appears to do the right thing - passed a bootstrap on x86 but that probably means it never got triggered :( . The particular case of interest was not vectorizing : #define min(x,y) ((x) <= (y) ? (x) : (y)) int a[256] __attribute__((aligned (16))); int b[256] __attribute__((aligned (16))); int c[256] __attribute__((aligned (16))); void foo (int x, int y) { int i; for (i = 0; i < x && i < y; // i < min (x, y); i++) a[i] = b[i] * c[i]; } but vectorizing the commented region. I've tentatively worked out a fix in tree-loop-im.c which looks like a bit of a grotesque hack .... * Attended LLVM devcon in Week 15. Useful and interesting and conference. == Plans == * Pursue backporting gnu_unique_object upstream. * Look at some of the existing blueprints and start discussions around prioritizing this. * Investigate some of the SEGVs with h-c partitioning. * Finish off the VFP addressing modes patch. Absences. * 03 May 2012 - 08 May 2012. * Linaro Connect Q2.12 - May 28 - June 1 -

13 years, 6 months

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[ACTIVITY] Apr 16 - Apr 20

by Ulrich Weigand

== GCC == * Checked in backport patch to fix LP #972648 into Linaro GCC 4.6. * Checked in fix for incorrect vld alignment hints to FSF mainline and 4.7 branch. * Investigated options to fix stack re-alignment. * Ongoing investigation of LP #959242: design problem in vectorizer pattern detection logic causes ICE in certain cases where an original sequence is recognized as part of *two* potential patterns simultaneously. * Ongoing work on improving end-of-loop value computation. 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

13 years, 6 months

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[ACTIVITY] report week 16

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-04-10 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04?|| 2012-02-01 || == cp15-rework == * sent out v1 patchseries for cp15 cleanup to the mailing list, finally * handled review comments on drop-cpu-reset-model-id patchseries == kvm-boot-wrapper == * imported libfdt device tree library and Dave Martin's code from the big.LITTLE boot-wrapper, to add support to the KVM boot wrapper for handling device tree blobs. Patch series sent, will probably commit next week unless there are review issues * that will more or less wrap this blueprint up == other == * usual upstream patch review; QEMU 1.1 soft feature freeze was start of this week, hardfreeze will be beginning of May, people (including me :-)) are trying to squeeze things in under the wire... -- PMM

13 years, 6 months

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[ACTIVITY] 16th - 19th April

by Andrew Stubbs

* Linaro GCC Investigated the latest test failure for the neon-extend patch. The test for GCC Bugzilla 43137 is failing again. It turns out to be because my switching sign_extend to use a DImode output, rather than two SImode subreg outputs has exposed a bug in the lower-subreg pass. I've spent most of the week trying to figure what can be done about this and discussing the problem with Richard Sandiford upstream. Richard Earnshaw approved my neon-negate patch. That patch depends on the neon-immediates patch which is not approved yet, so I'll have to wait to commit it. Continued looking at NEON-v-core register allocation. Not much progress this week though. * Other Created a patch to make the GCC RTL dumps easier to diff. Posted it upstream and discussed it on the list. Vacation on Friday. * Next week Vacation Monday and Tuesday

13 years, 6 months

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Update on stack (re-)alignment issues

by Ulrich Weigand

Hello, I've been following up on the discussion we had on Monday regarding stack alignment, and noticed that I had mis-remembered the current state of affairs. Ramana asked me on Tuesday to provide a write-up of the actual status, so here we go ... To summarize the background of the problem: on ARM, the incoming stack pointer is only guaranteed to be aligned to an 8 byte boundary. This means that objects on the stack (local variables, spill slots, temporaries etc.) cannot easily be aligned to more than 8 bytes. This can potentially cause problems in two situations: 1) The object's default alignment (according to its type) is larger than 8 bytes 2) The object has a forced non-default alignment that is larger than 8 bytes The first situation should in theory never appear, since according to the ARM ABI all types have a default alignment of at most 8 bytes. However, due to the current mix-up in GCC, vector types actually are considered to have a 16-byte alignment requirement in GCC. The second situation can only appear with local variables that are declared using attribute ((aligned)). We had discussed on Monday that we need to fix the second situation, since this can always occur and is supported on other platforms. By doing so, we would then automatically fix the first situation as well. However, this reasoning turns out to be incorrect. There are currently in GCC *two* completely separate mechanisms that can be used to align objects on the stack to larger than the ABI guaranteed stack pointer alignment: A) Re-alignment of the full stack frame. This is what is used by the Intel back-end (and only the Intel back-end). At function entry, generated code will align the stack pointer itself to whatever is necessary to fulfil alignment requirements of all objects on the stack. This may necessitate follow-on changes: the frame pointer, if there is one, will likewise need to be aligned at runtime. Also, since incoming stack arguments are now no longer at a fixed offset relative to the stack pointer *or* frame pointer in some cases, we might need an extra register as argument pointer. This method allows extra alignment for *any* object on the stack, but needs significant back-end support in order to be enabled on any non-Intel architecture. B) Dynamic allocation of selected stack variables. This is implemented by common code with no involvement of the back-end. In effect, the code in cfgexpand.c:expand_stack_vars that decides on how to allocate local variables on the stack will remove all variables that require extra alignment and place them into an extra structure. Generated prologue code will then in effect dynamically allocate and align that structure on the stack, and just store a pointer to it as "variable" into the normal stack frame. All other areas of the frame are unaffected. Since this method just simulates code the programmer could have written themselves using alloca, it does not require *any* back-end support and is enabled by default everywhere. However, it only works for regular local variables, and not for any other objects on the stack. Objects on the stack *except* local variables always use default alignment. Since on most platforms, except Intel and *currently* ARM, the ABI stack pointer alignment is sufficient to implement default alignments, method B) as above is able to fulfil all stack alignments. Intel uses method A), so they're also OK. In effect, it's only ARM due to the vector type alignment problem that runs into the situation that neither method works. Under those circumstances, given that: - we want to fix vector type alignment in order to become ABI compliant - once we've fixed this, we're in the same situation as other platforms and method B) already fixes stack alignment problems - implementing method A) is therefore both quite involved *and* actually superfluous I'd now rather recommend that we *don't* try to implement method A) (full stack-frame re-alignment) on ARM. Comments? 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 Vorsitzende des Aufsichtsrats: Martina Koederitz | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

13 years, 6 months

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[ACTIVITY] April 9 - April 13

by Thiago Jung Bauermann

Hi, GDB for Android: * Continued conversation about .note.ABI-tag. * Committed upsream the second of three patches for building gdbserver on Android. * Continued working on a crtbrand.c for bionic. 2012.04 release: * Tested the gdb-linaro/7.4 branch on armv5tel, x86 and x86_64, both natively and remotely. Compared results against the 2012.02 release. * Ran the release process, made the release. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 6 months

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[ACTIVITY] April 2 - April 6

by Thiago Jung Bauermann

Hi, GDB for Android: * Investigated .note.ABI-tag generation in glibc and FreeBSD. Wrote crtbrand.c for bionic based on FreeBSD's crtbrand.c. Tried to integrate it with bionic's build system. * Contacted Google engineers about adding .note.ABI-tag to Android binaries. 2012.04 release: * Started working on the release. Applied the latest patches from the FSF 7.4 branch to gdb-linaro/7.4 and also my patches to compile gdbserver with the Android toolchain. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 6 months

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[ACTIVITY] 9th - 13th April

by Andrew Stubbs

* Linaro GCC Spun release tarballs for Linaro GCC 4.6 and 4.7. Pushed them to Michael's servers and launched the testing. Continued trying to get the 64-bit NEON stuff to work. The negdi2 patch needed some reworking following upstream review, and the extend patch has mysteriously reintroduced a performance regression when the operation is done in core-registers, which needs to be solved, but the other patches seem ok at the moment, although the shift stuff is blocked on benchmarking. I've begun looking at how my changes affect spec2000, and whether the register allocation could be done better. Unfortunately, given that the test systems are currently giving spec results with a low level of consistency (and therefore confidence), this has mostly been by visual inspection, so far. * Other Public Holiday on Monday.

13 years, 6 months

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getting armv7 linker to emit armv4t thumb interworking

by Allen Martin

I have a cross toolchain I configured with "--with-arch=armv7-a --with-cpu=cortex-a9 --with-tune=cortex-a9" and I want the linker to emit armv4t compatible thumb interworking, but I can't seem to get it to. I noticed that if I create a armv4t toolchain with "--with-arch=armv4t --with-cpu=arm7tdmi --with-tune=arm7tdmi" and then I pass "--use-blx" to the linker it will emit armv7 thumb interworking. There doesn't seem to be any inverse "--no-use-blx" type switch though. Is this a bug/limitation of the linker or am I misunderstanding something? -Allen nvpublic

13 years, 6 months

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[PATCH] ld: add switch to disable use of BLX instructions

by Allen Martin

Add --no-use-blx switch to force disabling of BLX instructions for thumb interworking. This allows ld to emit code that is armv4t safe even if configured for armv5 or later. --- bfd/bfd-in.h | 4 ++-- bfd/bfd-in2.h | 4 ++-- bfd/elf32-arm.c | 10 +++++++++- ld/emultempl/armelf.em | 11 +++++++++-- 4 files changed, 22 insertions(+), 7 deletions(-) diff --git a/bfd/bfd-in.h b/bfd/bfd-in.h index a477b49..0a81327 100644 --- a/bfd/bfd-in.h +++ b/bfd/bfd-in.h @@ -872,8 +872,8 @@ extern bfd_boolean bfd_elf32_arm_process_before_allocation (bfd *, struct bfd_link_info *); void bfd_elf32_arm_set_target_relocs - (bfd *, struct bfd_link_info *, int, char *, int, int, bfd_arm_vfp11_fix, - int, int, int, int, int); + (bfd *, struct bfd_link_info *, int, char *, int, int, int, + bfd_arm_vfp11_fix, int, int, int, int, int); extern bfd_boolean bfd_elf32_arm_get_bfd_for_interworking (bfd *, struct bfd_link_info *); diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h index 22fcdf6..45c5376 100644 --- a/bfd/bfd-in2.h +++ b/bfd/bfd-in2.h @@ -879,8 +879,8 @@ extern bfd_boolean bfd_elf32_arm_process_before_allocation (bfd *, struct bfd_link_info *); void bfd_elf32_arm_set_target_relocs - (bfd *, struct bfd_link_info *, int, char *, int, int, bfd_arm_vfp11_fix, - int, int, int, int, int); + (bfd *, struct bfd_link_info *, int, char *, int, int, int, + bfd_arm_vfp11_fix, int, int, int, int, int); extern bfd_boolean bfd_elf32_arm_get_bfd_for_interworking (bfd *, struct bfd_link_info *); diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c index 1f6c1a0..7cbb5f8 100644 --- a/bfd/elf32-arm.c +++ b/bfd/elf32-arm.c @@ -2782,6 +2782,9 @@ struct elf32_arm_link_hash_table /* Nonzero if the ARM/Thumb BLX instructions are available for use. */ int use_blx; + /* Nonzero to prevent BLX instructions from being used. */ + int no_use_blx; + /* What sort of code sequences we should look for which may trigger the VFP11 denorm erratum. */ bfd_arm_vfp11_fix vfp11_fix; @@ -3332,6 +3335,7 @@ elf32_arm_link_hash_table_create (bfd *abfd) #endif ret->fix_v4bx = 0; ret->use_blx = 0; + ret->no_use_blx = 0; ret->vxworks_p = 0; ret->symbian_p = 0; ret->use_rel = 1; @@ -5939,7 +5943,9 @@ check_use_blx (struct elf32_arm_link_hash_table *globals) cpu_arch = bfd_elf_get_obj_attr_int (globals->obfd, OBJ_ATTR_PROC, Tag_CPU_arch); - if (globals->fix_arm1176) + if (globals->no_use_blx) + globals->use_blx = 0; + else if (globals->fix_arm1176) { if (cpu_arch == TAG_CPU_ARCH_V6T2 || cpu_arch > TAG_CPU_ARCH_V6K) globals->use_blx = 1; @@ -6800,6 +6806,7 @@ bfd_elf32_arm_set_target_relocs (struct bfd *output_bfd, char * target2_type, int fix_v4bx, int use_blx, + int no_use_blx, bfd_arm_vfp11_fix vfp11_fix, int no_enum_warn, int no_wchar_warn, int pic_veneer, int fix_cortex_a8, @@ -6825,6 +6832,7 @@ bfd_elf32_arm_set_target_relocs (struct bfd *output_bfd, } globals->fix_v4bx = fix_v4bx; globals->use_blx |= use_blx; + globals->no_use_blx = no_use_blx; globals->vfp11_fix = vfp11_fix; globals->pic_veneer = pic_veneer; globals->fix_cortex_a8 = fix_cortex_a8; diff --git a/ld/emultempl/armelf.em b/ld/emultempl/armelf.em index d29da59..14a0dcf 100644 --- a/ld/emultempl/armelf.em +++ b/ld/emultempl/armelf.em @@ -36,6 +36,7 @@ static int target1_is_rel = 0${TARGET1_IS_REL}; static char *target2_type = "${TARGET2_TYPE}"; static int fix_v4bx = 0; static int use_blx = 0; +static int no_use_blx = 0; static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT; static int fix_cortex_a8 = -1; static int no_enum_size_warning = 0; @@ -462,7 +463,7 @@ arm_elf_create_output_section_statements (void) bfd_elf32_arm_set_target_relocs (link_info.output_bfd, &link_info, target1_is_rel, - target2_type, fix_v4bx, use_blx, + target2_type, fix_v4bx, use_blx, no_use_blx, vfp11_denorm_fix, no_enum_size_warning, no_wchar_size_warning, pic_veneer, fix_cortex_a8, @@ -533,6 +534,7 @@ PARSE_AND_LIST_PROLOGUE=' #define OPTION_NO_MERGE_EXIDX_ENTRIES 316 #define OPTION_FIX_ARM1176 317 #define OPTION_NO_FIX_ARM1176 318 +#define OPTION_NO_USE_BLX 319 ' PARSE_AND_LIST_SHORTOPTS=p @@ -547,6 +549,7 @@ PARSE_AND_LIST_LONGOPTS=' { "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX}, { "fix-v4bx-interworking", no_argument, NULL, OPTION_FIX_V4BX_INTERWORKING}, { "use-blx", no_argument, NULL, OPTION_USE_BLX}, + { "no-use-blx", no_argument, NULL, OPTION_NO_USE_BLX}, { "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX}, { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING}, { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER}, @@ -567,7 +570,7 @@ PARSE_AND_LIST_OPTIONS=' fprintf (file, _(" --target2=<type> Specify definition of R_ARM_TARGET2\n")); fprintf (file, _(" --fix-v4bx Rewrite BX rn as MOV pc, rn for ARMv4\n")); fprintf (file, _(" --fix-v4bx-interworking Rewrite BX rn branch to ARMv4 interworking veneer\n")); - fprintf (file, _(" --use-blx Enable use of BLX instructions\n")); + fprintf (file, _(" --[no-]use-blx Disable/enable use of BLX instructions\n")); fprintf (file, _(" --vfp11-denorm-fix Specify how to fix VFP11 denorm erratum\n")); fprintf (file, _(" --no-enum-size-warning Don'\''t warn about objects with incompatible\n" " enum sizes\n")); @@ -625,6 +628,10 @@ PARSE_AND_LIST_ARGS_CASES=' use_blx = 1; break; + case OPTION_NO_USE_BLX: + no_use_blx = 1; + break; + case OPTION_VFP11_DENORM_FIX: if (strcmp (optarg, "none") == 0) vfp11_denorm_fix = BFD_ARM_VFP11_FIX_NONE; -- 1.7.5.4

13 years, 6 months

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[ACTIVITY] report week 15

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-04-10 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04?|| 2012-02-01 || == cp15-rework == * completed last of the register conversions, started on the final check-through and polish before it goes out to the mailing list * implemented changes following review of the clean-up-reset patchset == other == * qemu-linaro 2012.04 final testing (confirming an audio issue on the vexpress model LP:977610 wasn't a regresion) and release * patch review: pl330 dma controller model * patch review: samsung's sd card model overhaul * minor patch: fix compile failure on bsd * minor patch: fix failure to reset timer on a9 mptimer reset * minor patch: diagnose attempts to use python3 at configure time * sent arm-devs.next pullreq * put together a bug report in the form of a youtube video (!) as requested by the gmail folks -- PMM

13 years, 6 months

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[ACTIVITY] Apr 11 - Apr 13

by Ulrich Weigand

== GCC == * Committed fix for LP #968766 (PR tree-optimization/52880) to FSF mainline and Linaro GCC 4.6 and 4.7. * Created merge reqest to fix LP #972648 for Linaro GCC 4.6 by backporting mainline patch; pending approval. * Updated patch to use vld1.64/vst1.64 instead of vldm/vstm for vector moves. Testing detected problems in GCC core memory alignment logic (GCC assumes vector types are naturally aligned, which contradicts ARM ABI and ARM back-end assumptions). Started discussion on possible fixes. * Updated and retested patch to use vld1/vst1 to implement vec_set/vec_extract for cases where the scalar operand resides in memory. * Ongoing work on fixing LP #959242. * Ongoing work on improving end-of-loop value computation. 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

13 years, 6 months

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Linaro GDB 7.4 2012.04 released

by Thiago Jung Bauermann

The Linaro Toolchain Working Group is pleased to announce the release of Linaro GDB 7.4 2012.04. Linaro GDB 7.4 2012.04 is the second release in the 7.4 series. Based off the latest GDB 7.4, it includes a number of ARM-focused bug fixes and enhancements. Interesting changes include: * gdbserver can now be compiled with Android's toolchain. * Additional fixes from the GDB 7.4 branch, one of them being that it doesn't require makeinfo to build anymore. The source tarball is available at: https://launchpad.net/gdb-linaro/+milestone/7.4-2012.04 More information on Linaro GDB is available at: https://launchpad.net/gdb-linaro -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 6 months

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[ANNOUNCE] Linaro QEMU 2012.04 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2012.04. Linaro QEMU 2012.04 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: - ppoll syscall now supported in ARM linux-user mode - the SETEND instruction in the Thumb encoding now UNDEFs to match behaviour for the ARM encoding - the OMAP36xx UART FIFO status registers are now implemented (thanks to Jan Vesely) Known issues: - Graphics do not work for OMAP3 based models (beagle, overo) with 11.10 Linaro images. - Audio may not work on Versatile Express models with the latest Linaro kernel/hardware packs (LP:977610). The source tarball is available at: https://launchpad.net/qemu-linaro/+milestone/2012.03 More information on Linaro QEMU is available at: https://launchpad.net/qemu-linaro

13 years, 6 months

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[ANNOUNCE] Linaro GCC 4.7 and 4.6 2012.04 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2012.04 release of both Linaro GCC 4.7 and Linaro GCC 4.6. Linaro GCC 4.7 2012.04 is the first release in the 4.7 series. Based off the latest GCC 4.7.0+svn186061 release, it includes performance improvements especially around 64 bit operations. Interesting changes include: * Our first 4.7 based release * Updates to GCC 4.7.0+svn186061 * Better use of 16 bit Thumb-2 instructions for smaller code size * Implements 64 bit ones complement in NEON * Adds support for the ARMv6 saturation instructions * Backports the NEON lexer improvements for faster compilation * Backports the 64 bit multiply, divide, and mod improvements Fixes: * LP: #960283 slp pass assert when compiler configure with --enable-checking Linaro GCC 4.6 2012.04 is the fourteenth release in the 4.6 series. Based off the latest GCC 4.6.3+svn186060 release, this is the first release after entering maintenance. Interesting changes include: * Updates to 4.6.3+svn186060 Fixes: * LP: #960283 slp pass assert when compiler configure with --enable-checking The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.7-2012.04 https://launchpad.net/gcc-linaro/+milestone/4.6-2012.04 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/4.7/4.7-2012.04 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

13 years, 6 months

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O2 optimization with vectorize

by Singh, Ravi Kumar (Ravi)

All, In the below code, I tried few compiler options and got following observations: 1) arm-linux-gnueabi-gcc -O2 -mcpu=cortex-a15 -mfpu=neon -ftree-vectorizer-verbose=6 -ftree-vectorize Compiler throws following info messages: foo.c:16: note: not vectorized: unsupported use in stmt. foo.c:16: note: not vectorized: unsupported use in stmt. foo.c:18: note: not vectorized: unsupported use in stmt. foo.c:18: note: not vectorized: unsupported use in stmt. 2) -O2 -mcpu=cortex-a15 -mfpu=neon None of the generated code contains the NEON instructions. Code generated with case 1 is taking 3000 cycles, and code generated by option 2 is taking 2500 cycles. Even if vectorization failed in case1, it should not generate more inefficient code than case 2. My belief was that the executables from both would take same cycles, any thing done for doing unsuccessful vectorization must be reverted if it did not succeed. ################################################################### #define SIZE1 20 #define SIZE2 26 unsigned int array[SIZE1][SIZE2]; void foo() { unsigned int i,j; unsigned int max = 0; for(i = 0; i < SIZE1; i++) { for(j = 0; j < SIZE2; j++) { if (array[i][j] > max) { max = array[i][j]; index = j; } } } printf("Max value: %u Index: %u\n", max, index); } Regards RKS

13 years, 6 months

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2012.04 release prep

by Michael Hope

Hi there. The 2012.04 toolchain release is this week. Ulrich, I see your fix for LP: #968766 has been approved upstream. In theory it's too late but I'm happy to land it if you are. Could you decide and let Andrew know by the middle of Tuesday? Andrew, if you don't hear from Ulrich then spin away. Andrew, could you run the release process on Tuesday please? There's one extra step this month: once you've uploaded and spawned the job, go to the scheduler screen and click on 'Release' beside each of the ursas. I reserved them to make sure they'd be idle and ready to pick up the release build when ready. Thiago, let us know if Ulrich or I can lend a hand with the GDB release. -- Michael

13 years, 6 months

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Changing the time of the fortnightly performance call

by Ramana Radhakrishnan

Hi there, At the last call Michael asked if we could push this call back by 30 minutes given the changes due to daylight savings. Does anyone have any objections to a new time of 10 a.m. BST - 11 a.m. Central European - 9 p.m. New Zealand. ? cheers Ramana

13 years, 6 months

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[ACTIVITY] 2nd - 5th April

by Andrew Stubbs

* GCC Identified the latent bug that's upset my NEON-shifts testing. It turns out the define-insn-and-shift patterns in arm/sync.md have no length attributes set. Now that the NEON 64-bit shifts appear to be not broken, I've relaunched the 64-bit extend testing. Identified the problem with my NEON-64-bit-negate patch: I already knew it works better (produces more optimal code) with my NEON-immediates patch, but it turns out that at -O0 the other patch is a hard requirement or else bad things happen in output_move_vfp. Backported Ramana's patch for ARM-mode testing of my recent Thumb 64-bit test cases. I've applied it to Linaro GCC directly, without a merge proposal, as it's a very low-risk patch. Caught up with some launchpad blueprint fiddling. Completed the merges from 4.6 and 4.7 FSF. The 4.7 merge was tricky as it required working around a BZR bug; I've posted the workaround to the toolchain list. * Other On leave on Tuesday Public holiday on Friday. Attached a copy of the ARM Linux ABI document to KBentry 39 so we're hosting it somewhere, at least. Posted an internal Mentor/CS question about getting its old home restored, and getting a relicensed edition to allow others to use it as the basis for a hard-float equivalent.

13 years, 6 months

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[Activity] Week 14

by Ramana Radhakrishnan

=== Progress === * Worked on VFP addressing patch and corrected the failures. * Got SPEC2k up and running with hot cold partitioning. Some SEGVs that need investigation. In general results appear to be better in quite a few cases. * Investigated an issue with a merge request for upstream 4.7 branch into our tree. There was a testsuite failure and I wasn't able to reproduce it with a local i386 rebuild of the toolchain. Therefore we'll have to let this go in. == Plans == * I will be away for 2 days this week attending the LLVM conference in London. * Pursue backporting gnu_unique_object upstream. * Finish off the VFP addressing modes patch upstream. * Look at some of the existing blueprints and start discussions around prioritizing this. * Investigate some of the SEGVs with h-c partitioning. Absences. * Apr 12-13 : Euro-LLVM London. * Linaro Connect Q2.12 - May 28 - June 1 -

13 years, 6 months

1
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[Activity] Week 14

by Zhenqiang Chen

Summary: * Revise the patch for relocatable NLS support. * Code size benchmark analysis. Details: 1. Revise the patch for relocatable NLS support: lp:918926. * Read the gcc configure and makefile. * It seams hard to get the relative dir if the gcc is configured with --bindir=... --datadir/datarootdir. E.g. --bindir=/opt/bin --datarootdir=/tmp/data 2. Code size benchmark analysis with -Os * Investigate regression in small cases. 3. Try to build linaro gcc trunk with crosstool-ng. But it reports error when configuring libquadmath. * configure:9829: error: Link tests are not allowed after GCC_NO_EXECUTABLES. * Manual check or a simple case show libc.so can be linked. Plans: * Tuning optimization heuristics for -Os Planed leaves: * April 9 - 11: Vacations Best regards! -Zhenqiang

13 years, 6 months

1
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[ACTIVITY] report week 14

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-04-10 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04?|| 2012-02-01 || == other == * LP:970252 got a beagle board booting so I could read the UART version register; reviewed and applied to qemu-linaro the set of patches provided by Jan Vesely (thanks!) * sent a patchset cleaning up the GIC model so it is a self-contained sysbus device; this should make it easier to just drop in a functionally equivalent device which is a shim for an in-kernel GIC model that uses the hardware VGIC features * upstream review: save/load support for sd.c [patchset from Samsung] SPI bus [patchset from Petalogix] * put together qemu-linaro prerelease tarball and did some testing * performance evaluation finished and submitted

13 years, 6 months

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[ACTIVITY] 26th - 30th March

by Andrew Stubbs

Continued work on neon 64-bit correctness. This is really dragging out now. I had hoped to have had it fixed by now, but subtle bugs are subtle. The 16-bit opcodes patch is now committed both upstream and in Linaro GCC 4.7, however, so that's some progress at least. Posted benchmark results for the the 64-bit shifts in core registers. The results are inconclusive: the benchmark runs are too noisy.

13 years, 6 months

1
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Binary build release process

by Michael Hope

As part of closing out the Windows toolchain card, I've documented the binary build release process at: https://wiki.linaro.org/WorkingGroups/ToolChain/BinaryBuild/ReleaseProcess The interesting thing is a script that pulls builds from S3 and posts them to Launchpad. There's a curl command at the end that does the upload and might be useful. -- Michael

13 years, 6 months

1
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Re: [Linaro-toolchain-builds] [cbuild] eglibc-2.16~svn17843 armv7l completed

by Michael Hope

On 1 April 2012 05:56, Ramana Radhakrishnan <ramana.radhakrishnan(a)linaro.org> wrote: > I find it a bit worrying that all the nptl tests are failing with a > common error message > > http://builds.linaro.org/toolchain/eglibc-2.16~svn17843 > > Aborted' > make[6]: *** [/scratch/cbuild/slave/slaves/tcpanda05/eglibc-2.16~svn17843/eglibc/default/build/nptl/tst-cond7.out] > Error 1 > libgcc_s.so.1 must be installed for pthread_cancel to work > Didn't expect signal from child: got `Aborted' > > Why don't we have libgcc_s.so.1 installed on the system - shouldn't > that be there if there was a gcc properly installed on the system ? This is a bug on my side. I believe EGLIBC likes to have libgcc_s.so in the top of the build directory - at least that's the impression I got from reading the cross-test documentation the other day. I've logged LP: #971064 and will look into it. -- Michael

13 years, 6 months

1
1
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GCC 4.7 runtime library plans

by Michael Hope

Hi Ricardo, Matthias. GCC 4.7 is almost here and it's likely that Linaro GCC 4.7 will come out for next month's 2012.04 milestone. For the binary toolchain to work we need the 4.7 runtime libraries on the target. Matthias, what are your plans? How much of 4.7 is packaged so far? Ricardo, could we pull these updates to libgcc, libstdc++, and others into the LEB? These should be backwards compatible but there's always a risk. Using the 4.5 runtime with a 4.4 compiler back on Maverick was OK. -- Michaele

13 years, 6 months

3
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[ACTIVITY] March 26 - March 30

by Thiago Jung Bauermann

Hi, GDB for Android: * Submitted upstream three patches for building gdbserver on Android. Reworked two of them based on review comments, and committed one. * Investigated ARM EABI build attributes and .note.ABI-tag as ways of marking binaries as Android apps so that GDB can differentiate them from regular Linux ARM binaries. Build attributes are quite sophisticate and overkill for this purpose, and would also be out of place for Android on x86. .note.ABI-tag is simpler and more appropriate. Now experimenting with generating the .note.ABI-tag section on Android binaries. * Tried to find ARM GNU/Linux ABI supplement [1] but couldn't, contacted Mentor Graphics' webmaster about the problem. No response so far. Obs: This Friday (04/06) will be a holiday in Brazil and hopefully I will be AFK. [1] http://www.codesourcery.com/gnu_toolchains/arm/arm_gnu_linux_abi.pdf -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 6 months

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[ACTIVITY] Mar 26 - Mar 30

by Ulrich Weigand

== GCC == * Committed fix for LP #960283 (PR tree-optimization/52686) to FSF mainline as well as Linaro GCC 4.6 and 4.7. * Worked on patch to use vld1.64/vst1.64 instead of vldm/vstm for vector moves. Created merge request for testing. * Worked on patch to use vld1/vst1 to implement vec_set/vec_extract for cases where the scalar operand resides in memory. Created merge request for testing. * Ongoing work on fixing LP #959242. * Ongoing work on improving end-of-loop value computation. == Misc == * I'll be attending the Linux Foundation Collaboration Summit in San Francisco next week, and present on "GDB on ARM". 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

13 years, 7 months

1
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[Activity] Week 13

by Zhenqiang Chen

Summary: * Linaro binary toolchain 2012.03 release. * Investigate relocatable NLS support. * Code size benchmark analysis. Details: 1. Linaro binary toolchain 2012.03 release. * Bump and spawn 2012.02-20120326 build. * Validate the release candidate. * Update wiki for binary build tasks. 2. Investigate relocatable NLS support: lp:918926. * Root cause: gcc and binutils use a fixed LOCALEDIR (which is $prefix/share/locale) to call bindtextdomain. * Workout a reference patch for gcc to use relative dir (.../bin/../share/locale) to call bindtextdomain. 3. Code size benchmark analysis with -Os * Collect code size benchmark data. * In most cases, gcc 4.7 gets better result than gcc 4.6. * Investigate regression in several small cases. 4. Read the tree and rtl dump files to learn the optimizations and impacts on code size. Plans: * Fix lp:918926. * Investigate code size regression in gcc 4.7. * Tuning optimization heuristics for -Os. Planed leaves: * April 2 - 4: Chinese Qingming Festival. * April 9 - 11: Vacations Best regards! -Zhenqiang

13 years, 7 months

1
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[Activity] Week 13

by Ramana Radhakrishnan

=== Progress === * Caught up on email backlog. * Reworked the ARM backend specific bits of the VFP addressing modes patch and submitted again for some benchmarking and testing. Finished the PRE_MODIFY and POST_MODIFY bits of that as well. * Wrote up a small blueprint on the shrink-wrapping work. * Wrote up my Linaro performance review and sent it for review. * Looked at lower-subreg work that Kenneth Zadeck posted very quickly to see if it addressed some of the issues around and old intrinsics patch that Richard Sandiford submitted last year. It looks promising and might even have some impact on our 64 bit neon work . It fixes the 2 cases where things didn't look good. ( Upstream bug reports PR48941 and PR51980) but it falls over while building glibc. Sent a bug report to Kenneth about this. * The perf packages on OMAP4 in our latest releases from 12.03 are just broken, they don't work. Reported the issue to Paul Larson on IRC to check what's going on. perf top doesn't work reliably on the kernels and there appears to be some issues with interrupt support for some of these . I specifically ran into https://bugs.launchpad.net/ubuntu/+source/linux-ti-omap4/+bug/956693 . * Answered a few questions from Uli about my prototypes for the vld1 replacing vldm instructions and a vget_lane patch. == Plans == * Work through some of the blueprints before the call next week. * Set up perf on my panda. It works on my AC100 - so the inclination was to also have something that worked on my panda but clearly it doesn't. * Finish off the VFP addressing modes patch and get it in. * Look at Partial Partial PRE next or attempt the next project. Absences. * Apr 12-13 : Euro-LLVM London. * 1 week holiday sometime before that - to be booked * Linaro Connect Q2.12 - May 28 - June 1 - travel booked - hotel to be booked.

13 years, 7 months

1
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[ACTIVITY] report week 13

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-04-10 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04?|| 2012-02-01 || == cp15-rework == * posted 14-patch patchset which creates a QOM class per CPU type and moves a lot of the reset/constant-feature-register setup to the init functions for these new classes. This is then a much nicer base to sit cp15 rework on. * solved the final design knot of how to handle registers whose reset value depends on the CPU type (the QOM patches make this much more straightforward) == other == * upstream patch review * updated Paul Brook's BE8 userspace support patch and sent out a v2 * ran through qemu-linaro buglist identifying fixes to go into next release * linaro performance review ate up a lot of time this week and will probably do so next week too :-(

13 years, 7 months

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Shrink wrapping blueprint.

by Ramana Radhakrishnan

I've written up a blueprint for Shrink-wrapping here. https://blueprints.launchpad.net/gcc-linaro/+spec/shrink-wrapping Comments are welcome. Ramana

13 years, 7 months

1
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Agenda for performance call on April 3.

by Ramana Radhakrishnan

https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-04-03 If there's anything people would like to add please do so on the wiki page. Ramana

13 years, 7 months

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Agenda for Monday

by Michael Hope

...is up at: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-04-02 Feel free to add items. Andrew, could you look into the 4.7 bzr merge problem before then? -- Michael

13 years, 7 months

1
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4.7 is now the Launchpad dev focus

by Michael Hope

I've changed the development focus in the Launchpad project to Linaro GCC 4.7. This means that: * Checking out lp:gcc-linaro now gives you the 4.7 branch * New merge requests are targeted to 4.7 by default This doesn't affect any already checked out branches or pending merge requests. -- Michael

13 years, 7 months

1
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[ACTIVITY] March 19 - March 23

by Thiago Jung Bauermann

Hi, GDB for Android: * Wrote three patches for the build system allowing gdbserver to be cross-compiled on Android [which were submitted upstream this Monday]. * Started studying the ARM EABI to work on a way to mark a binary as an Android application as opposed to a regular Linux EABI one. * Wrote self-evaluation for Linaro performance review. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 7 months

1
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GCC build speed and backlog

by Michael Hope

The PandaBoard auto builders are having a hard time keeping with longer build and test times of 4.7 and the re-enabled libstdc++ tests. For reference, here's how much each step costs: Bootstrap GCC with C, C++, Fortran, and Obj-C: 9 hours Test GCC: 9.5 hours Test libstdc++: 4.4 hours Test libgomp: 0.9 hours Other tests: 0.2 hours for a grand total of 23.8 hours. Every new commit gives a merge request and trunk build for both A9 and ARMv5 giving 95 hours of compute time. GCC 4.6 takes five hours to build and 5.5 to test. This is just a FYI. I'll think about ways of speeding things up or adding capacity. An i.MX6 with 2 GB of RAM and SATA would be nice... -- Michael

13 years, 7 months

2
2
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Once again bogus testsuite failures

by Ulrich Weigand

Hi Michael, I'm seeing what looks like bogus testsuite failures again: https://code.launchpad.net/~uweigand/gcc-linaro/lp-960283-4.7/+merge/99069 I suspect this is still caused by the .ident version string, which now appears to be: [gcc-linaro/~uweigand revision 114974] While it no longer contains the branch name, it still contains my user name, which happens to include the string "and" ... 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 Vorsitzende des Aufsichtsrats: Martina Koederitz | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

13 years, 7 months

2
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[Activity] Week 12

by Ramana Radhakrishnan

== Progress === * Off sick for 4 days last week. * Looked at the results for the vfp writeback modes and caught up with some analysis on the one day I did work. === Plans === * Catch up on email after absences. * Catch up on patches backlog Absences. * Apr 12-13 : Euro-LLVM London. * 1 week holiday sometime before that - to be booked * Linaro Connect Q2.12 - May 28 - June 1 - travel booked - hotel to be booked. ---

13 years, 7 months

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[ACTIVITY] 19th 23rd March

by Andrew Stubbs

* Linaro GCC Applied my ARM conditional-execution and thumb 16-bit instruction size optimization patch to upstream and Linaro 4.7. Continued work on (slowly) working the bugs out of my 64-bit NEON patches. Figuring out bootstrap failures is not easy! Eventually discovered that: * the NEON shifts patch was broken because combine was using the patterns in ways they weren't intended. * the NEON neg patch was broken because it needed an early-clobber marker on the scratch register. I've also reworked the use of insn_enabled to make it a little less clunky. It's just an aesthetic change though. If all goes well with my weekend bootstrap builds I should have the patches reposted next week. * Other Richard Earnshaw asked me to bless use of a CS patch submitted to gcc-patches@ by a third party. I dug out the original patch from the CS archives and posted that to the message thread.

13 years, 7 months

1
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[Activity] Week 12

by Zhenqiang Chen

Summary: * Validation for embedded toolchain 2012q1 update release and Linaro binary toolchain 2012.03 release. * Failed case analysis for -Os. * Read benchmark code Details: 1. Validation for embedded toolchain 2012q1 update release and Linaro binary toolchain 2012.03 release. 2. Root cause the new failed cased pr30951.c with -Os. In function tree_swap_operands_p (fold-const.c), there is a check if (optimize_function_for_size_p (cfun)) return 0; which blocks to swap (x != x + 10) to (x + 10 != x). And the following optimization can only handle (x + 10 != x). 3. Read some benchmark codes to find the opportunities for code size optimization. Plans: * Finalize Linaro binary toolchain 2012.03 release. * Read benchmark codes. Best regards! -Zhenqiang

13 years, 7 months

1
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KVM blueprints

by Michael Hope

I've finished creating the KVM blueprints for the remains of this quarter. You can find them by burrowing down from the top level category blueprints: Everything that is new development: https://blueprints.launchpad.net/linaro-toolchain-misc/+spec/kvm-development Everything that is platforms and integration: https://blueprints.launchpad.net/linaro-toolchain-misc/+spec/kvm-integration I've also marked up the original wiki page with links to the blueprints: https://wiki.linaro.org/MichaelHope/Sandbox/Q1.12ToDo Some are placeholders pending agreement or being superceeded by existing cards in other teams. Now I need to figure out how to track them. -- Michael

13 years, 7 months

1
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[ACTIVITY] report week 11

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-03-30 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04?|| 2012-02-01 || == cp15-rework == * more progress, mostly in figuring out how to connect the cp15 patches with work by Andreas Färber to convert CPUs to QEMU's new object model. * Patch series is now 36 patches long... (will probably split into two parts for submission) == other == * upstream patch review * linaro performance review time again... -- PMM

13 years, 7 months

1
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[ACTIVITY] Mar 19 - Mar 23

by Ulrich Weigand

== GCC == * Posted second part of fwprop-subreg patch to gcc-patches. * Investigated LP #960283, determined root cause, created patch, and opened merge requests against Linaro GCC 4.6 and 4.7. Opened mainline bugzilla PR tree-optimization/52686. * Investigated LP #960274 and LP #960817, identified both as duplicates of LP #960283. * Investigated LP #959242, determined root cause. Ongoing investigation of possible fixes. * Ongoing work on improving end-of-loop value computation. 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

13 years, 7 months

1
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Agenda for Monday

by Michael Hope

The draft agenda for Monday's call is at: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-03-26 and is: * Review action items from last meeting * Validation lab move is delayed * Daylight savings changes done * KVM * Blueprints are (half) spawned * Rusty away prep * Other business * multiarch * [[MichaelHope/Sandbox/MultiarchNotes]] * Want to get upstream(s) * Richard's thoughts * Interaction with multilib * Reducing the number of builds * 4.7 status * Import/merge working? * Keep an eye out for other improvements/regressions Feel free to edit! -- Michael

13 years, 7 months

1
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Getting multiarch upstream

by Michael Hope

Konstantinos, Loïc, and I talked last night about multiarch. Linaro want multiarch and will use it in all our products and hence need to get it upstream. There's another meeting in a week to figure out what's next. I've written a page on the uses, issues, and history at: https://wiki.linaro.org/MichaelHope/Sandbox/MultiarchNotes Please edit and add and correct things. The page isn't Linaro's position but we need to have answers for the arguments. I see no particular blockers especially if we separate the concerns. -- Michael

13 years, 7 months

1
0
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Basic porter access to the tcpandas

by Michael Hope

I've added a new job called 'porter' which reserves the first tcpanda that comes free. This can be used to reproduce a bug or benchmark result against an existing binary build. For example, say you want to see if a fault exists on recent trunk: * Go to http://ex.seabright.co.nz/helpers/buildlog/gcc-4.8 * See the last successful ARM build was gcc-4.8~svn185503 * Go to http://ex.seabright.co.nz/helpers/scheduler/spawn * Spawn a job called 'porter' into the a9-builder queue * Keep polling http://ex.seabright.co.nz/helpers/scheduler until a board shows as 'porter/ready' * Log into the board using ssh cbuild(a)board.v * Change to /scratch/cbuild/slave/slaves * rsync the binary across using rsync control:~/cbuild/build/gcc-4.8~svn185503/gcc-*cortexa9*xz . * Extract the binary and have at it The board will drop back into the queue after 48 hours. You can release it early by doing a 'killall sleep'. Please do any work under /scratch/cbuild/slave/slaves as this is automatically deleted when the next job starts. Zhenqiang, could you add this to the jobs page please? -- Michael

13 years, 7 months

1
0
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libav inline assembly

by Michael Hope

I've create a blueprint covering the basic functions in libav that are implemented as inline assembly: https://blueprints.launchpad.net/gcc-linaro/+spec/investigate-libav-inline-… These are a mix of multiplies, clipping, byte swap, and unaligned access. We do OK on half of them but at least byte swap and 32x32 -> top half of 64 aren't as good as they could be. Let's discuss the investigation at the next performance meeting. -- Michael

13 years, 7 months

2
2
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[ACTIVITY] March 12 - March 16

by Thiago Jung Bauermann

Hi, Linaro bugs: - #926472: Native gdb can't know multithreads of Android processes Tried to reproduce but couldn't do a GDB build similar to the bug reporter's. Found a workaround for him anyway. - #942529: gdb failed to debug application (gdb reports about internal error) Reproduced the bug and found out it's fixed in GDB 7.4. It's a bug in Ubuntu GDB not Linaro, so reassigned to the Ubuntu project. Linaro GDB is already at version 7.4 so we're good. - #954714: dropped patch reintroduces gcore relro backtrace problem Reviewed the proposed patch. It's good. GDB for Android: - Started creating patches for build problems when trying to compile gdbserver for Android. Will have patches to submit in the next few days. - Studied libthread_db.c to see what's special about it that it has to be statically linked. Didn't find anything and indeed Android's own libthread_db.so works fine. Didn't get an answer yet when I asked about it on the Android mailing list. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 7 months

2
1
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[ACTIVITY] w12

by Asa Sandahl

Hi! * Moved the v8 wiki page the the Benchmark section, and corrected the documentation a bit: https://wiki.linaro.org/WorkingGroups/ToolChain/Benchmarks/V8_And_SunSpider * Pushed the v8 cbuild make file to: https://code.launchpad.net/~linaro-toolchain-dev/cbuild/trunk Note that the file containing the v8 source code and SunSpider must be added under cbuild/files. You can find the file attached to the wiki page above. * Pushed the parser for the SunSpider results: https://code.launchpad.net/~linaro-toolchain-dev/linaro-toolchain-benchmark… * Pushed the v8 benchmarking results: https://code.launchpad.net/~linaro-toolchain-wg/linaro-toolchain-benchmarks… Regards Åsa

13 years, 7 months

1
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[Activity] Week 11

by Ramana Radhakrishnan

==Progress=== * Did some work to improve code generation for addressing modes in VFP registers. * Looked at some more cases and detected that there are 2 areas of improvement for the future * shrink-wrapping * Too many unnecessary ldm / stm stacking for cases with small structures being passed . * Committed configure.ac changes. * Committed MALLOC_ABI_ALIGNMENT changes. * Looked at some upstream testsuite failures. There are about 54 too many test failures in vect.exp that need to be looked at at some point. === Plans === * Push vfp wb patches upstream. * Resurrect partial-partial PRE Absences. * 1 week holiday sometime before that - to be booked * Linaro Connect Q2.12 - May 28 - June 1 - travel booked - hotel to be booked.

13 years, 7 months

1
0
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libav blueprints

by Michael Hope

I've created blueprints for the libav missed optimisations and added references to Ramana's page at: https://wiki.linaro.org/RamanaRadhakrishnan/Sandbox/RRQ112ConnectLibavgcc46… Those that are new and in progress I've assigned to the relevant person. Ulrich, I couldn't find a end of loop counter blueprint so I created a new one. -- Michael

13 years, 7 months

1
0
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Linaro GCC 4.6 entering maintenance; 4.5 end of life

by Michael Hope

This is the first announcement on upcoming changes to the supported Linaro GCC versions. GCC 4.7 is expected out in the next two weeks. We plan to switch to 4.7 for the Linaro GCC 2012.04 release and, as part of that, will put Linaro GCC 4.6 into maintenance and retire Linaro GCC 4.5. While in maintenance we will continue to update, fix bugs, and do releases on 4.6. No further changes or releases will be made to 4.5. All historical releases and branches will stay available. For more informatio, please see the flyer at: https://wiki.linaro.org/WorkingGroups/ToolChain/Flyer especially the section on Lifecycle: https://wiki.linaro.org/WorkingGroups/ToolChain/Flyer#Lifecycle The formal change notes will be sent after the 2012.04 release. -- Michael

13 years, 7 months

2
2
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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded: * rebased against current OE-core * my patch that introduces an image fs alignment is now upstream * noticed that the newly introduced bdwgc recipe (the Hans Boehm Garbage collector which is needed by guile) uses a version of libatomic that fails when building in Thumb mode * has been fixed upstream already * pulseaudio/libatomics-ops_1.2.bb has the same issue and just sets ARM_INSTRUCTION_SET to "arm" (probably until a new version gets pulled in) * we can use the same workaround till then * found a bug in the recipe for the Linaro external binary toolchain where some header files are placed into a wrong directory during the install step * which prevents python from being built * now fixed Please note that I'll be on vacation till 04/13/2012. Regards, Ken

13 years, 7 months

1
0
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OpenEmbedded blueprints

by Michael Hope

Hi Ken. I've made a meta-linaro project on Launchpad and created the near term blueprints. See: https://blueprints.launchpad.net/meta-linaro You're almost done with the initial layer work. Next is scripting up the build and integrating with LAVA followed by turning on the build for other architectures. I've dropped the build in the cloud investigation. Let's use tcserver01 as it works and is fast enough. Keep an eye on the validation lab cloud the Validation guys are talking about - we might shift there later. I've sent the draft card to Loïc who will massage the text and get it on the TSC agenda. The current blueprints focus on toolchain validation and come to a hard stop past there. Once we have TSC approval we can go further and talk with the Platforms guys about who does what. -- Michael

13 years, 7 months

2
1
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tcpanda auto builders going offline

by Michael Hope

The Validation lab is shifting to a new location this week so I've started a graceful shutdown of the tcpanda boards. Merge requests will continue to queue and run on x86 but will back up until the lab comes online at the end of this week. If the backlog gets too big then I'll re-enable an ursa board or two. Please work as normal but expect the builds results to take longer to come through. -- Michael

13 years, 7 months

1
0
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Plan for changing the binary toolchain to 4.7 and hardfloat

by Michael Hope

Hi there. Over the next three months both GCC 4.7 and Ubuntu 12.04 'Precise' are coming out. We'll switch over to these pretty quickly which will affect our internal testing and anyone using the binary toolchain. The changeover plan including dates, details of what's happening, and backwards compatibility is at: https://wiki.linaro.org/MichaelHope/Sandbox/BinariesMigration Comments and concerns are welcome, -- Michael

13 years, 7 months

6
8
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[ACTIVITY] 12th - 17th March

by Andrew Stubbs

* Linaro GCC Spun release tarballs for Linaro GCC 4.5 and 4.6. Launched the build and test runs. When those completed, briefly checked the results, and launched the package build tests and benchmark runs. Continued trying to figure out how my NEON 64-bit immediates patch had caused a bootstrap failure. The problem turned out to be an assembler bug ([1]). I've adjusted my patch to work around the problem. This is the only real way to do it given that, even if I fixed the assembler right away, there'll be broken assemblers knocking around for some time to come. The compiler now bootstraps correctly in a manual build. I've submitted it for testing on Michael's systems, so hopefully this patch will be ready to post back upstream soonish. Continued trying to figure out the neon shifts bootstrap failure. I ran a cross-compiler test suite run, but didn't witness any obvious problems. Launched a manual bootstrap to reproduce the problem (once the board because available after testing the immediates patch), so I should have something to work with next week. Attempted to merge lp:gcc/4.7 to lp:gcc-linaro/4.7, but got a bzr error. I asked for help on #bzr, and 'jelmer' is looking into it. Apparently the history didn't import in quite the same way as lp:gcc/trunk, or something. Helped Dmitry Antipov with a relocation (possible) bug. * Other Two days leave (Thursday and Friday). Booked flights and hotels to Hong Kong for Linaro Connect Q2.12 [1] http://sourceware.org/bugzilla/show_bug.cgi?id=13843

13 years, 7 months

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[Activity] Week 11

by Zhenqiang Chen

Summary: * Linaro binary toolchain 2012.03 release. * Make multilib and multiarch work together. * Failed case analysis for -Os. Details: 1. Handover Asa's linaro day-to-day jobs (check auto build health, proposals health and ticket triage) 2. Linaro binary toolchain 2012.03 release. * Update config to 2012.03 * Fix lp:939008 and patch for lp:939143 3. Multilib/multiarch investigation for linaro toolchain. * Update the logic in set_multilib_dir to set multiarch_dir when it matches the format (.:.:$(MULTIARCH_DIRNAME)). Now multilib and multiarch can work together. A reference build to support marm/march=armv5t is at http://people.linaro.org/~zhenqiangchen/ * Try to build -mfoat-abi=hard/-fpu=neon. But libgcc build fails with message "ld: error ... uses VFP register arguments, ..." 4. Investigate new failed cases in -Os regression test. * For gcc.dg/pr30951.c, both option -O0 and -O2 can optimize (x == x + 10) to (0). But -Os can not. * For gcc.dg/atomic-lockfree.c and gcc.dg/atomic-noinline.c, the optimization is correct. The test cases can only be test with -O0. Plans: * Code size benchmark tuning. Best regards! -Zhenqiang

13 years, 7 months

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[ACTIVITY] w11

by Asa Sandahl

Hi! * V8 - SunSpider The pieces for building in cbuild and parsing with the linaro-toolchain-benchmark scripts are in place. Ran the SunSpider benchmark across a few toolchains with the o2-neon and o3-neon variants. I have documented my work on this page, but not analyzed the results yet. https://wiki.linaro.org/AsaSandahl/Sandbox/JavaScriptBenchmark What worries me is that there is too much variation in some of the test results. Probably caused by the garbage collection kicking in at unpredictable times. I will try to monitor the gc and investigate if it can be controlled somehow. I would like to do a gcc-4.4 run as well. Android's original toolchain is based on gcc-4.4.3(?) and that is what I compared against when doing measurements internally. However, I have problem compiling C++ with gcc-4.4 - it is this one again: home/asa-san/cbuild/slaves/ursa3/gcc-4.4.5/gcc-binary/bin/../libexec/gcc/armv7l-unknown-linux-gnueabi/4.4.5/cc1plus: /home/asa-san/cbuild/slaves/ursa3/gcc-4.4.5/gcc-binary/lib/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/libppl.so.7) * Handed over daily tasks to Zhenqiang. Regards Åsa

13 years, 7 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded: * verified that the release candidate of our 2012.03 toolchain (both source and binary) is able to build the sato and qt4e images of oe-core+meta-linaro - they are booting fine using QEMU * out sick starting from Tue :/ Regards, Ken

13 years, 7 months

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[ACTIVITY] report week 11

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-03-30 || || Historical Milestones: ||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 || ||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04?|| 2012-02-01 || == cp15-rework == * converted crn=1; still TODO: crn=0, some loose ends; then reassess the design in the light of experience doing register conversion * I've estimated another two weeks here but this might be out, because in practice much of my time is sucked up by 'other' issues == other == * tracked down cause of LP:947888 gpg crash bug: newer glibc use /proc/self/maps to decide whether a printf format string using '%n' is in writable memory, and qemu's maps emulation wasn't good enough * fixed a thumb decoder bug where we were treating 'setend' like 'cps' * investigated whether we had any conveniently testable cores which take advantage of the ARM ARM latitude for UNDEFfing even on failed condition code checks (answer, not really but the KVM code to handle this case should be small enough not to worry about its not-yet-tested nature) * qemu-linaro 2012.03 release (lots of bug fixes, plus exynos4 and highbank models thanks to Samsung and Calxeda) * code review: imx31 board patches * rebased qemu-linaro on upstream and applied some new patches from Christoffer for ARM KVM support * LP:956799: added ppoll to QEMU arm-linux-user (a one liner...) * boot-wrapper: moved initrd load address up so we can handle large kernels (like Android!) * sent pullreqs for target-arm, arm-devs patchqueues

13 years, 7 months

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[ACTIVITY] Mar 15 - Mar 16

by Ulrich Weigand

== GCC == * Checked first part of fwprop-subreg patch into mainline. * Checked Ira's vectorizer patches into mainline. * Ongoing work on improving end-of-loop value computation. 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

13 years, 7 months

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Final Building at -O3 writeup

by Michael Hope

The final version of the 'Building at -O3' writeup is at: https://wiki.linaro.org/Internal/ToolChain/BuildingAtO3 This updates the SPEC 2000 results to show that there is a net win which is held back by a bad (but understood) regression in one benchmark. Thank you all for your work on this, -- Michael

13 years, 7 months

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[ANNOUNCE] Linaro QEMU 2012.03 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2012.03. Linaro QEMU 2012.03 is the latest monthly release of qemu-linaro. Based off upstream (trunk) QEMU, it includes a number of ARM-focused bug fixes and enhancements. Highlights in this month's release: - we now default to enabling 'reserve memory for guest' on 64 bit hosts in linux-user-mode. This significantly reduces the chances of QEMU being unable to satisfy a guest process mmap() request. - Fix for a bug that was causing spurious failures of the glibc check for "%n in a format string must be in a read-only area of memory" when running in linux-user-mode. - QEMU's built-in boot loader now supports passing a device tree blob to the kernel: if you boot with -kernel mykernel (and optionally -initrd myinitrd) you can now also use the new command line option -dtb my.dtb to pass a device tree. - This version includes an initial implementation of a model of the Samsung Exynos4210 SoC, used by board models 'nuri' and 'smdkc210' (thanks to Evgeny Voevodin, Maksim Kozlov, Igor Mitsyanko and Dmitry Solodkiy from Samsung, who submitted this work to upstream QEMU). - This version includes an initial implementation of a model of the Calxeda Highbank SoC, used by board model 'highbank' (thanks to Rob Herring and Mark Langsdorf of Calxeda, who submitted this work to upstream QEMU). - various other minor bug fixes (detailed in the Changelog.LINARO). Known issues: - Graphics do not work for OMAP3 based models (beagle, overo) with 11.10 Linaro images. The source tarball is available at: https://launchpad.net/qemu-linaro/+milestone/2012.03 More information on Linaro QEMU is available at: https://launchpad.net/qemu-linaro

13 years, 7 months

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Release done, branch is open

by Michael Hope

The GCC release tested up just fine. The branch is now open for commits. The next release is Thursday the 12th of April. Note that this is the week after Easter. -- Michael

13 years, 7 months

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[ANNOUNCE] Linaro GCC 4.6 and 4.5 2012.03 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2012.03 release of both Linaro GCC 4.6 and Linaro GCC 4.5. Linaro GCC 4.6 2012.03 is the thirteenth release in the 4.6 series. Based off the latest GCC 4.6.3 release, it contains a new scheduler pressure pass, implements new instructions, and contains a number of bug fixes. Interesting changes include: * Updates to 4.6.3. * Better performance by accounting for register pressure when scheduling instructions. * Support for the ARMv6 USAT/SSAT saturation instructions. * Support for the VFP VCVT fixed to floating point conversion instruction. Fixes: * LP: #922474 Bug in __sync_lock_release with 64 bit primitives * LP: #923397 Alignment attribute has no effect under certain conditions * LP: #926855 [ARMhf] gcc produces assembler it can't compile * LP: #936863 ICE in constprop.2 (ARM NEON related?) * LP: #942307 'asm' operand requires impossible reload * LP: #952565 Not compliant with the ABI for multi-register NEON intrinsics Linaro GCC 4.5 2012.03 is the nineteenth release in the 4.5 series. Based off the latest GCC 4.5.3+svn184976 release, this is a maintenance only update. Interesting changes include: * Updates to 4.5.3+svn184976. The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.6-2012.03 https://launchpad.net/gcc-linaro/+milestone/4.5-2012.03 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/4.6/4.6-2012.03 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

13 years, 7 months

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EEMBC AndEBench

by Michael Hope

EEMBC have announced AndEBench, a mixed native/Java benchmark for Android. It's available on the Market. I don't know much more. It seems to be CPU bound and the test names sound a bit like CoreMark. The source is available for license and might be worth the Android guys looking into. The awesome thing is they used the 2012.01 Linaro Binary toolchain release to build the native parts - see the compiler version string in the log :) -- Michael

13 years, 7 months

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[ACTIVITY] May 5 - May 9

by Thiago Jung Bauermann

Hi, GDB for Android: * Wrote first draft of the GDB for Android card. * Found out that there actually is a libthread_db.so in /system/lib and was able to compile (after a small hack) an FSF gdbserver 7.3 which uses the libthread_db.so from Android and correctly shows all threads in the process. So the libthread_db.so from Android actually works, still have to learn why they don't use it. * Tried to compile a native GDB which uses libthread_db.so but no luck so far. There are many differences in bionic's header files which upset libiberty and gnulib which are not easy to work around. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 7 months

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