- linaro-toolchain - lists.linaro.org

by Ulrich Weigand

== GCC == * Worked on reimplementing reassociation pass based on review comments I had received. * Identified root cause and worked on fix for vectorizer bug causing unaligned memory accesses (reported by Mans). 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

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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded-Core/meta-linaro: * fixed the binary toolchain support on master (still 2012.03) * fixed armhf support for Linaro GCC 4.6 on master * backport of Linaro GCC 4.7 r114985 * tested the images using QEMU - no failures * now the master branch supports building images for ARM, MIPS, PPC, X86 and X86_64 using the latest (2012.05) releases of Linaro GCC 4.6 or 4.7 * add tags on meta-linaro to easily find the revision for a particular Linaro GCC * changed cbuild to pull in the master branches of OE-Core and meta-linaro * merged the branch that allows to build OpenEmbedded-Core using cbuild http://bazaar.launchpad.net/~kwerner/cbuild/oecore/changes/ * updated docs on the wiki Misc: * public holiday on Thu, vacation on Fri * I'll be back on Monday : ) Regards, Ken

13 years

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[ACTIVITY] May 28 - June 1

by Thiago Jung Bauermann

Hi, GDB for Android: * Submitted and committed trivial patch to gdbserver which made it compile again on Android. A patch had been added which made gdbserver use a MIPS-related constant which Android doesn't provide. * Compared testsuite results of GDB on Android vs regular Linux. Unfortunately there's a lot of noise because the GCC 4.4 used by the Android SDK generates bad debuginfo which confuses GDB and breaks a lot of tests. Overall, it seems GDB on Android is in a generally good shape. Still need to run the testsuite again with an Android based on a newer compiler to have a better comparison. * Mozilla has a GDB patch to call gdbarch_addr_bits_remove before comparing PCs in breakpoint handling which seems like a sensible thing to do. Still, running the testsuite with and without this patch didn't make a difference on Android or regular Linux. * Remotely attended the GDB for Android session at Connect. Prepared the following page to go with it: https://wiki.linaro.org/ThiagoBauermann/Sandbox/AndroidGDBConnectSession -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years

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[ACTIVITY] May 21 - May 25

by Thiago Jung Bauermann

Hi, GDB for Android: * Created patch to expand the ~ in "set solib-search-path". Despite doing the right thing in other commands, GDB doesn't understand ~ in solib-search-path, which made me lose some time in a debugging session trying to figure out what was going on. Committed upstream. * Looked into AOSP patch which hardcodes use of fork tracing instead of thread events. Found out that gdbserver actually already prefers fork tracing on both Linux and Android (tested on ICS and Linaro 12.04). This must have been a problem in some earlier version, and the patch is unnecessary now. * Set up a QEMU instance with Linaro Android 12.04. Got dropbear ssh on it and ran the GDB testsuite remotely on the VM. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years

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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded-Core/meta-linaro: * added a default xorg.conf for the qemuarmv7a MACHINE * necessary because OE-Core master switched from Xfbdev to Xorg * noticed that hard float with Linaro GCC 4.6 works on denzil but is broken on master due to differences on the requested/provided interpreter * it used to (accidentally?) work when /lib/ld-linux.so.3 was used even for armhf * need to check out what loader name OE-Core really wants to use * worked on getting OE-Core to build with Linaro GCC 4.7 * verified that the recipes for Linaro GCC 4.7 are working for ARM, MIPS, PPC, X86, X86_64 * all images are working! * updated the wiki pages Regards, Ken

13 years

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No meetings today

by Michael Hope

I've cancelled today's meeting due to the UK and NZ holidays. I'll see you all at the Thursday standup. -- Michael

13 years

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[ACTIVITY] report week 21

by Peter Maydell

Linaro Connect edition... RAG: GREEN: productive Connect, hammered out a KVM TODO list * As usual, most sessions don't really intersect with KVM/QEMU work, so the bulk of the benefit of the week was in informal discussions and hacking sessions. Useful outcomes there: * Dragged Rusty through some of the more obscure corners of the ARM architecture, in the course of doing a review of all the A15 cp15 registers and how KVM should handle them * Thrashed out a todo list for getting to "initial upstreamable patchset" for KVM: https://docs.google.com/document/d/1TSpDKQZ-6u-HH_2BNY_85jDStI2YDhENf5-z8Nb… * Nailed down a few decisions we'd left hanging for a bit * A few sessions that seem worth mentioning: * Enterprise bootloaders Jon M definitely pushing the idea that servers will want ACPI, UEFI, etc all to look as consistent and like x86 as possible. This includes a desire for UEFI in the virtual environment provided by QEMU/KVM. We've been aware we might want to do that, but there is definitely some work to do to get UEFI running (probably a combo of QEMU bugfixes/feature work and patching UEFI). Total work required hard to estimate because you just have to keep fixing bugs until it works... (The push for UEFI was repeated in a couple of other sessions too.) * v8 discussion The question of whether there will be a v8 QEMU was raised (again). There do seem to be enough people interested that we should be able to collaborate on a user-mode emulator, which I think is a good outcome. This will obviously depend on release of enough public info on the architecture. * KVM performance Bit of a null session, as it turns out that we aren't really ready to think about performance. We believe there aren't any obvious areas requiring optimisation in the current KVM patchset. Virtio is the only thing to be added later, and this is really just missing QEMU side rather than needing specific kernel support. We did take the opportunity to go through our TODO list for KVM functionality; nobody raised anything we'd missed, so that's good. -- PMM

13 years, 1 month

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Fwd: linaro kernel fails to build with gcc4.7

by Fathi Boudra

Hi, It seems bug 947111 affects the binary toolchain. ---------- Forwarded message ---------- linaro-kernel seems to fail to build with the GCC4.7 [4.7.1 20120402 prerelease ] picked up from http://releases.linaro.org/12.04/components/toolchain/binaries/gcc-linaro-a…. Here is the link to the job which failed https://ci.linaro.org/jenkins/job/linux-linaro-tracking_panda-omap2plus_san… This issue had been recorded previously with bug https://bugs.launchpad.net/ubuntu/+source/armel-cross-toolchain-base/+bug/9…. This appeared to be fixed already according to the bug report, but seem to have regressed again.

13 years, 1 month

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Support for building OpenEmbedded-Core using Linaro GCC 4.7

by Ken Werner

Hello, The OE-layer 'meta-linaro' now employs an updated recipe for building OpenEmbedded using the Linaro GCC 4.7 2012.05. The following configuration has been tested: OE-sources: * OpenEmbedded-Core: - git://git.openembedded.org/openembedded-core - rev 363424c * BitBake: - git://git.openembedded.org/bitbake - rev f8bf449 * meta-linaro: - git://git.linaro.org/people/kwerner/meta-linaro.git - rev 323a982 compiler: * Linaro GCC 4.7 2012.05 https://launchpad.net/gcc-linaro/4.7/4.7-2012.05/+download/gcc-linaro-4.7-2… images: * core-image-minimal (just enough to get a shell) * core-image-sato (Xorg, gtk+2) * qt4e-demo-image (Qt 4.8 embedded) targets: * ARM: - qemuarm (vesatilepb, ARMv5, arm926ej-s) - qemuarmv7a (vexpress, ARMv7, -march=armv7-a, -mthumb, -mfloat-abi=hard, -mfpu=neon) * MIPS: - qemumips (malta, -march=mips32) * PPC: - qemuppc (mac99, -mcpu=603e) * X86 - qemux86 * X86_64 - qemux86-64 build/host system: * x86_64 Ubuntu 11.10 (Oneiric) The easiest way to reproduce: wget http://people.linaro.org/~kwerner/oe-core/script/build-oe-core-linaro.sh bash ~/build-oe-core-linaro.sh --workdir workdir --dldir /home/ken/data/downloads --gcctype "linaro-4.7" --mlbranch 323a982 --oebranch 363424c --bbbranch f8bf449 --oepatches "http://people.linaro.org/~kwerner/oe-core/patches/armv7a-tree-vectorize.pat…" More information about the meta-linaro layer can be found at: https://wiki.linaro.org/KenWerner/Sandbox/OpenEmbedded-Core Regards Ken

13 years, 1 month

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[ANNOUNCE] Linaro Toolchain Binaries 2012.05 released

by Zhenqiang Chen

The Linaro Toolchain Working Group is pleased to announce the 2012.05 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 2012.05 * Linaro GDB 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: * Updates the system root to Ubuntu Precise * Switches to the arm-linux-gnueabihf triplet * Compiles programs for hard float by default * Includes soft float support for ARMv4T and later systems * Includes debug symbols for debugging and backtracing the C library The Linux version is supported on Ubuntu 10.04.3 and 12.04, 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/2012.05 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.

13 years, 1 month

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GCC performance meeting.

by Ramana Radhakrishnan

Thanks to the change in the schedule the agenda is here. https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-05-28 If there are any topics folks would like to add to this for today please feel free to do so now given we have a session in under 2 hours. regards, Ramana

13 years, 1 month

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[Activity ] Week 21

by Ramana Radhakrishnan

Progress * Fixed PR53334 upstream - something that broke eembc builds. * Usual meetings. * Work through some of the speed tickets and upstream bugzilla perf tickets in preparation for connect. * Prepared for connect. Looked through some open issues and investigating PR48941 patch. Uli and I had some discussions around the patches for this and I had an idea later this evening to try out something with __builtin_shuffle which certainly looks interesting and is effectively what we came up with . It's probably better to use __builtin_shuffle rather than inventing something on our own. In the process found a bug with automatic rev generation from vec_perm expressions and that should now be fixed. * Worked through the auto-inc-dec stuff. Still needs some work and looks unlikely to complete before connect and that's something I need to keep working through. * Prepared for connect. Plans * Connect next week ! Absences: 28 May - 1 June : Linaro Connect

13 years, 1 month

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[ACTIVITY] 21st - 25th May

by Andrew Stubbs

Committed my core-shifts patch into Linaro GCC. Checked and posted my (newly rebased) neon-shifts patch upstream for review. Continued work on my brain-dump of work in progress. Cleaned up, tested and posted example testcases and before/after compiler output for all my work-in-progress patches. Looked at LaunchPad bug #851258. It's a miss-optimization bug that would take some effort to fix. Discovered that my lower-subreg build had failed due to Werror. Fixed the warning, reuploaded the sources, and relaunched the build. Prepared for travel to Connect.

13 years, 1 month

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[ACTIVITY] May 21 - May 25

by Ulrich Weigand

== GCC == * Followed up on review comments on reassociation pass. * Analyzed performance headroom of Linaro GCC 4.7 compared to various other compilers and identified several missing optimisations. == Misc == * Prepared for Linaro Connect Hong Kong. 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, 1 month

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[ACTIVITY] report week 21

by Peter Maydell

Current Milestones: || || Planned || Estimate || Actual || ||cp15-rework || 2012-01-06 || 2012-06-23 || || == other == * preparation for Connect * wrote up and sent out proposal about handling TrustZone for KVM * investigated some issues Riku found when testing his packaged version of KVM (one model issue, one kernel-too-old issue) * usual upstream maintainer duties -- PMM

13 years, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded-Core/meta-linaro: * cbuild enhancements: * debugged failures till I noticed cbuild was pulling in the wrong branch of meta-linaro (now fixed) * added support for checking the oe-core build prerequisites * the images are now automatically bootet using qemu * sizes of the images and package sizes are now recorded * update to Linaro GCC 4.6 2012.05 (denzil) and Linaro GCC 4.7 2012.05 (master) * debugged build failure when using Linaro GCC 4.6 in a hard float configuration * turns out that OE expects the GCC to respect the ARCH_FLAGS_FOR_TARGET env variable to build libgcc and friends properly for the given target (another missing patch to build the GCC the OE-Core way) * fix tested and checked in (denzil) * created/updated wiki pages: https://wiki.linaro.org/WorkingGroups/ToolChain/Outputs/OpenEmbedded-Core https://wiki.linaro.org/KenWerner/Sandbox/OpenEmbedded-Core Regards, Ken

13 years, 1 month

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KVM integration output page

by Michael Hope

Hi Peter, Riku. I've written up a page covering the KVM integration work done this quarter at: https://wiki.linaro.org/WorkingGroups/ToolChain/Outputs/KVMIntegration Could you review it please, including the instructions at: https://wiki.linaro.org/WorkingGroups/ToolChain/Outputs/KVMIntegration/Quic… It overlaps with the howtos that you both have but is supposed to be both short and a snapshot in time. If it looks good then I'll use this to closeout this quarter's KVM card. -- Michael

13 years, 1 month

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My topics for Connect

by Michael Hope

Here's my list of things I'd like to knock off during Connect: https://wiki.linaro.org/MichaelHope/Sandbox/Q2.12Plans Have a think about specific things you'd like to achieve as I'll be asking on Monday. -- Michael

13 years, 1 month

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[ACTIVITY] May 14 - May 18

by Thiago Jung Bauermann

Hi, GDB for Android: * Fixed the PC offset in jmp_buf but the patch still wasn't working. It turns out that GDB wasn't loading the libc6.so symbols even though I set both sysroot *and* solib-search-path. Copied libc6.so to GDB's cwd and the patch worked (will investigate this next week). Submitted upstream, currently under review. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 1 month

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[ACTIVITY] May 7 - May 11

by Thiago Jung Bauermann

Hi, GDB for Android: * Worked on patch which uses the correct offset for finding the PC value inside the jmp_buf on Android binaries. Things weren't working though, and in the end it turns out that the value used in AOSP's patch is wrong. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 1 month

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Testsuite differences with a hard float shift

by Michael Hope

Hi Zhenqiang. I've had a look at the difference between testsuite results on our current softfp Natty builders and the new hard float Precise builders. The diff and notes is at: http://people.linaro.org/~michaelh/incoming/hard-float-builder-diff.txt There's a lot of commonality: /usr/bin/ld: cannot find {S,g}crt1.o: builder fault. I've fixed this. sorry, unimplemented: Thumb-1 hard-float VFP ABI errors: tests where they set the architecture to ARMv5T and use our default Thumb mode. This causes the compiler to fail as it doesn't support Thumb-1 with hard float. arm_iwmmxt_ok5222.c:1:0: sorry, unimplemented: iWMMXt and hardware floating point Some are real: +FAIL: gcc.c-torture/compile/sync-3.c -O0 (test for excess errors) /tmp/cc3ufndj.s:436: Error: co-processor offset out of range +FAIL: gcc.dg/pr48335-2.c (test for excess errors) pr48335-2.c:19:30: internal compiler error: in expand_expr_addr_expr_1, at expr.c:7527 +FAIL: gcc.dg/pr48335-5.c (test for excess errors) pr48335-5.c:17:1: error: unrecognizable insn: (insn 11 10 12 3 (set (reg:DI 141) (unspec:DI [ (mem/c:DI (plus:SI (reg/f:SI 129 virtual-stack-vars) (const_int -8 [0xfffffffffffffff8])) [2 S8 A32]) ] UNSPEC_MISALIGNED_ACCESS)) /cbuild/slaves/ursa2/gcc-linaro-4.7+bzr114988~zhenqiang-chen~gnueabihf/gcc/gcc-linaro-4.7/gcc/testsuite/gcc.dg/pr48335-5.c:16 -1 (nil)) +FAIL: gcc.dg/torture/stackalign/builtin-apply-2.c -O0 execution test Some are marked as unsupported but shouldn't be: +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-11a.c +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-11b.c +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-11.c +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-11c.c +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-25.c +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-26.c +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-28.c +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-2.c +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-32.c Could you look into the unsupported ones please? I'll fix the crt1 problems and respin the build. -- Michael

13 years, 1 month

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Changes to the auto builders

by Michael Hope

The Precise based hard float auto builders are now online. Every merge request and commit to gcc-linaro will now be built build both on a Natty softfp system and a Precise hard float. Let's run this in parallel for a while before updating the validation lab. I've also updated the x86 cloud builders from Natty to Precise. A quick test showed no regressions but I want to run them in parallel for a bit to be sure. -- Michael

13 years, 1 month

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[Activity] Week 20

by Ramana Radhakrishnan

Progress * Proposed backport for vfp addressing modes patch. * Investigated the build issue with EEMBC and have a candidate patch for upstream trunk. (PR53334) * Investigated auto-inc-dec sched changes. * Some upstream patch review. Plans * Work on auto-inc-dec sched changes. * Finish PR53334 patch upstream. * Work through some of the speed tickets and upstream bugzilla perf tickets in preparation for connect.

13 years, 1 month

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[ACTIVITY] 14th -18th May

by Andrew Stubbs

Remerged the GCC 4.7 branch from upstream. I had previously misunderstood how to resolve a conflict where Uli had committed a different version of the same patch upstream. Spun the GCC 4.6 and 4.7 release tarballs and passed them to Michael for testing. Continued work on improving code generation for 64-bit and/or/not/xor. I now have this working to the point where it would be ready to post upstream .... except that it depends on my other patches that are not yet committed (or even reviewed) upstream. Rebased and modified my core-shifts patch following Ramana's code review. Then regression tested it - no regressions - and committed the patch upstream. I've also updated the launchpad branch and resubmitted the merge request with the finalized upstream patch. Rebased the neon-shifts patch. I'll repost this upstream as soon as I'm happy it still works correctly. Worked on a brain-dump of all I have been working on recently. This will hopefully help others take over my tasks after the contract expires. I still need to put together all the test-cases and examples that Ramana requested.

13 years, 1 month

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[Activity] Week 20

by Zhenqiang Chen

Summary: * Linaro binary toolchain 2012.05 release. * Code size benchmark analysis. Details: 1. Linaro binary toolchain 2012.05 release * Check-in the patches to support multilib and arm-linux-gnueabihf in linaro crosstool. * Update config to 2012.05 release, which will build multilib toolchain: default option: -mthumb -march=armv7-a -mfloat-api=hard -mtune=cortex-a9 -mfpu=vfpv3-d16 armv4t option: -marm -march=armv4t -mfloat-api=soft * Try u-boot build with the armv4t option. * Add arm-linux-gnueabihf.mpi for windows installer. * Tests and regression analysis. 2. During code size regression analysis, we find postreload can not optimize some cases when spilling happens, reassociation for PHI note might lead to spilling, expand generates inefficient codes which can not be optimized by later passes and poor code layout introduces more branch instructions. Plans: * Linaro binary toolchain 2012.05 release. * Investigate other code size regressions in 4.7. Best regards! -Zhenqiang

13 years, 1 month

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[ACTIVITY] May 14 - May 18

by Ulrich Weigand

== GCC == * Completed implementation of new optimization sub-pass to improve re-association of plus/minus chains for types with undefined overflow (to improve end-of-loop value computation); posted to gcc-patches for review. 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, 1 month

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[ACTIVITY] report week 20

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 == * fixed various issues, sent out v2 series, looks good to me == other == * qemu-linaro 2012.05 released * thinking about how to handle TrustZone in the context of QEMU/KVM (we're not going to try to do a full emulation, but we need to define a coherent line for how we support running guests that are expecting to run as either S or NS PL1/0 kernels) * had a play with booting UEFI on QEMU -- fails early on trying to use the TrustZone-only VBAR register * usual upstream maintainer duties -- PMM

13 years, 1 month

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Re: Testsuite differences with a hard float shift

by Michael Hope

On 17 May 2012 18:23, Zhenqiang Chen <zhenqiang.chen(a)linaro.org> wrote: >> Some are marked as unsupported but shouldn't be: >> >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-11a.c >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-11b.c >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-11.c >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-11c.c >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-25.c >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-26.c >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-28.c >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-2.c >> +UNSUPPORTED: gcc.dg/tree-ssa/gen-vect-32.c > > The root cause is "target vect_cmdline_needed". For those cases, they > have notes as: > > /* { dg-do run { target vect_cmdline_needed } } */ > > In function "check_effective_target_vect_cmdline_needed" of > lib/target-supports.exp, it check_effective_target_arm_neon. > > For our build, it is arm neon, > check_effective_target_vect_cmdline_needed return 0. > > A quick fix is to add another dg-do run like: > /* { dg-do run { target arm*-*-*eabihf } } */ I've looked into this further and the tests make no sense. The test themselves are turned off unless the compiler needs extra command line arguments to enable some type of SIMD. See PR21292. Let's discuss this on Monday. I've put an updated list at: http://people.linaro.org/~michaelh/incoming/hard-float-builder-diff-2.txt The interesting ones below. They're a mix of assembler faults, ICEs, and testisims. None are due to the change in triplet so please propose your patch upstream. -- Michael +FAIL: gcc.c-torture/compile/sync-1.c -O0 (test for excess errors) +FAIL: gcc.c-torture/compile/sync-3.c -O0 (test for excess errors) /tmp/ccGuCO1R.s:463: Error: co-processor offset out of range ** Doesn't happen with a natty sysroot. Assembler fault? +FAIL: gcc.dg/builtin-apply2.c execution test ** Testism. Skips if an explicit float-abi=hard is passed. +FAIL: gcc.dg/pr48335-5.c (test for excess errors) (insn 11 10 12 3 (set (reg:DI 141) (unspec:DI [ (mem/c:DI (plus:SI (reg/f:SI 129 virtual-stack-vars) (const_int -8 [0xfffffffffffffff8])) [2 S8 A32]) ] UNSPEC_MISALIGNED_ACCESS)) /cbuild/slaves/ursa2/gcc-linaro-4.7+bzr114985~michaelh1~hard-builder-test/gcc/gcc-linaro-4.7/gcc/testsuite/gcc.dg/pr48335-5.c:16 -1 (nil)) ** The unaligned access support doesn't include an unaligned DI pattern? +FAIL: gcc.dg/torture/stackalign/builtin-apply-2.c -Os execution test ** Testism. Assumes doubles are passed in core registers. +UNSUPPORTED: gcc.target/arm/mmx-1.c /cbuild/slaves/ursa2/gcc-linaro-4.7+bzr114985~michaelh1~hard-builder-test/gcc/gcc-linaro-4.7/gcc/testsuite/gcc.target/arm/g2.c:12:1: sorry, unimplemented: Thumb-1 hard-float VFP ABI ** Various forms. Needs thought.

13 years, 1 month

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Branches unfrozen

by Andrew Stubbs

The releases have been made, so the branches have been updated and returned to their normal state. Andrew

13 years, 1 month

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[ANNOUNCE] Linaro QEMU 2012.05 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2012.05. Linaro QEMU 2012.05 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: - Beagle bootrom emulation now correctly handles FAT12/FAT16 images (thanks to Peter Chubb for the bug report and patch). - We now support running ARM BE8 userspace binaries (ie byte-invariant big-endian data and little-endian code). 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/2012.05 More information on Linaro QEMU is available at: https://launchpad.net/qemu-linaro

13 years, 1 month

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[ANNOUNCE] No release of Linaro GDB this month

by Michael Hope

There will be no release of Linaro GDB this month. We're busy working on upstreaming Android support and will backport them as they come ready. -- Michael

13 years, 1 month

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[ANNOUNCE] Linaro GCC 4.7 and 4.6 2012.05 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2012.05 release of both Linaro GCC 4.7 and Linaro GCC 4.6. Linaro GCC 4.7 2012.05 is the second release in the 4.7 series. Based off the latest GCC 4.7.0+svn187448 release, it includes performance improvements especially around 64 bit operations. Interesting changes include: * Updates to GCC 4.7.0+svn187448 * Uses the new /lib/ld-linux-armhf.so.3 loader for hard float binaries * Adds support for negating 64 bit values in NEON * Improves loading of 64 bit immediate values in NEON Fixes: * LP: #959242 ICE: in vect_is_simple_use_1, at tree-vect-stmts.c * LP: #968766 GCC 4.6.3 (cc1) crashes when compiling MPFR 3.1.0 Linaro GCC 4.6 2012.05 is the fifteenth release in the 4.6 series. Based off the latest GCC 4.6.3+svn187273 release, this is the second release after entering maintenance. Interesting changes include: * Updates to 4.6.3+svn187273 Fixes: * LP: #959242 ICE: in vect_is_simple_use_1, at tree-vect-stmts.c * LP: #968766 GCC 4.6.3 (cc1) crashes when compiling MPFR 3.1.0 * LP: #972648 ICE (segfault) in gsi_for_stmt The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.7-2012.05 https://launchpad.net/gcc-linaro/+milestone/4.6-2012.05 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/4.7/4.7-2012.05 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, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded-Core/meta-linaro: * reverted the gcc 4.7 support from the denzil branch as it's causing too much trouble * instead we'll use a oe-core master snaphsot for 4.7 * committed a fix to our kernel bbappend * started to look into cbuild * added configurations to support building the images for all oe-core targets * created lp:~kwerner/cbuild/oecore * kicked off a build for ARM, MIPS, PPC, X86, X86_64 using Linaro GCC 4.6 2012.04 Misc: * IBM internal meetings * public holiday on Thu, vacation on Fri I'll be back on monday Regards, Ken

13 years, 1 month

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GCC trunk fails to build

by Michael Hope

Hi Ramana. FYI, gcc trunk fails to bootstrap with: ../../../../gcc-4.8~/libgcc/libgcc2.c: In function '__mulvdi3': ../../../../gcc-4.8~/libgcc/libgcc2.c:397:1: internal compiler error: in df_uses_record, at df-scan.c:3179 A cross compiler fails when building EEMBC with: (insn 1166 1165 1167 155 (set (reg:CC 24 cc) (compare:CC (reg:SI 2148 [ D.6766 ]) (const_int 5000 [0x1388]))) iirflt01/bmark.c:501 -1 (nil)) iirflt01/bmark.c:1138:1: internal compiler error: in extract_insn, at recog.c:2131 The last revision that bootstrapped was 187203. 187223 and 187275 failed. -- Michael

13 years, 1 month

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Branches Frozen

by Andrew Stubbs

The GCC 4.7 merge testing is currently in progress. We're a little late with it, so I'm spinning the release speculatively. This being the case I've made the lp:gcc-linaro branch read-only, just in case. This shouldn't prevent anybody from reading the branch with "lp:gcc-linaro", but the "lp:~linaro-toolchain-dev/gcc-linaro/4.7" name will be broken for a while, so you may find "bzr pull" broken. (The reason being that the only way to make a bzr branch read-only is to change its owner.) I will put the branch back to its normal state as soon as the release is done. Andrew

13 years, 1 month

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State of Fast Model in the lab

by Michael Hope

Hi there. We'd like to run a Fast Model in the validation lab for KVM testing. Is there a blueprint for this? What's the status? Paul and I discussed a rough plan a few months ago. It was along the lines of: * A x86 machine as the Fast Model host * An emulated vexpress-a15 as the KVM host * A vexpress-a15 as the KVM guest * LAVA treats the Fast Model as a board * Jobs are spawned into the LAVA scheduler * Once the KVM host is running, everything else is toolchain specific and done via shell scripts The dispatcher would: * Grab the hwpack * Grab the nano rootfs * Build the rootfs with separate kernel, initrd, and dtb using linaro-media-create * Start the Fast Model with the boot wrapper, kernel, and rootfs * Use the console to run the test script There's more information on the steps required at: https://wiki.linaro.org/MichaelHope/Sandbox/KVMUseCase -- Michael

13 years, 1 month

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[ACTIVITY] May 07 - May 11

by Ulrich Weigand

== GCC == * Checked in patch to fix LP #959242 (GCC PR tree-optimization/52633) to Linaro GCC 4.7 and 4.6. * Completed design of new optimization sub-pass to improve re-association of plus/minus chains for types with undefined overflow (to improve end-of-loop value computation); started implementation. * Investigated GCC PR target/44141. * 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, 1 month

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Agenda for tomorrow's performance call.

by Ramana Radhakrishnan

https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-05-15 I've put together an initial version of the blueprints we could consider . Are there any other topics that folks are interested in adding ? If so, could you add it to the wiki page. Thanks, Ramana

13 years, 1 month

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[ACTIVITY] 7th - 11th May

by Andrew Stubbs

* Linaro GCC Did the merges from upstream ahead of the Linaro releases next week. Unfortunately, with the Linaro office move the test system is running slowly, and it took a long while for Uli's concerns about the 4.7 merge to be confirmed, so this might cause a bit of delay while I remerge, and retest. Begun looking at a solution for GCC Bugzilla pr53189. I've rewritten the anddi3, iordi3 and xordi3 patterns to avoid the problems when NEON is not available, and also improved the situation when NEON is enabled. There are still a few kinks that need to be ironed out with poorly optimized extend-and-operate sequences, and then I'm done, I hope. * Other Public holiday on Monday.

13 years, 1 month

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[Activity] Week 19

by Zhenqiang Chen

Summary: * arm-linux-gnueabihf and multilib support for linaro toolchain. Details: 1. Make arm-linux-gnueabihf and multilib work together for linaro toolchain * Tuning the include and link path and order. * The build requires a sysroot with both soft and hard float support (Refer precise-sysroot-armhf-r0c.tar.bz2 at http://people.linaro.org/~michaelh/incoming/). With the sysroot, a reference multilib toolchain build is at http://people.linaro.org/~zhenqiangchen/ * Update the Makefiles in tests to support armv4t build. * Setup a pandaboard and run some tests. Plans: * Investigate other code size regressions in 4.7. * Prepare for linaro binary toolchain 2012.05 release. Best regards! -Zhenqiang

13 years, 1 month

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[Activity] Week 19

by Ramana Radhakrishnan

<Short week given bank holiday> Progress * Committed the VFP addressing modes patch. * Investigated PR48941 patch a bit more - looks like an issue with the register allocator around vzip and vuzp patterns and not sure what the easiest way of sorting this really is. I wonder if we should be looking at some of the issues around secondary reloads or friends for this particular patch - we generate too many vmov's for my liking and with more complex code this ends up as spills ! * Backported gnu_unique_objects patch. Need approval to commit in Linaro tree. Plans * Backport VFP addressing patch to Linaro tree. * Finish smin-umin idiom patch in the backend. * smin - umin idiom patch in middle-end - investigate further. Absences: * May 28- June 3 : Away to Linaro Connect.

13 years, 1 month

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[ACTIVITY] report week 19

by Peter Maydell

(short week, bank holiday) 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 == * various fixes following Rusty's review * attempted to fix an issue where we would leak the hashtable every time a new thread is created in linux-user mode. This has run into the problem that qemu's current "copy this cpu object" function has no place to insert cpu-specific code to handle state which can't be simply shallow copied. This might introduce a dependency on some object model rework, though I'd prefer to avoid that. == other == * put together and tested qemu-linaro 2012.05 prerelease tarball * usual upstream review: couple of ARM fixes sent in for 1.1 -- PMM

13 years, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, OpenEmbedded-Core/meta-linaro: * finished script to automate the checkout, build and test of oe-core+meta-linaro (denzil) * currently supports GCC 4.6 based toolchains only * pushed support for Linaro GCC 4.7 to meta-linaro/master * backported support for GCC 4.7 based toolchains to the denzil branch of meta-linaro * when using GCC 4.7 against the oe-core release: * Qt 4.8 fails to build (probably needs backporting a fix) * sato images are booting but don't show the matchbox wm Regards, Ken

13 years, 1 month

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Building OpenEmbedded inside cbuild

by Michael Hope

Hi Ken. I've checked in a rough script that builds OpenEmbedded inside the cbuild Makefile-based auto builders. To run it yourself: * bzr branch lp:cbuild * cd cbuild * cp oecore.mk lib * mkdir -p slaves/`hostname` * cd slaves/`hostname` * make -f ../../lib/oecore.mk It's a Makefile which runs locally or remotely. Everything is under cbuild/lib. The steps are driven by steps.mk which use stamp files to see what is finished and what needs running. The normal steps are configure; build; install; testsuite; run. I've split the build and similar steps into one per architecture and added a ping to the scheduler (http://ex.seabright.co.nz/helpers/scheduler) between each one as it will take some time. Logs end up in gcc-native/*.txt. To toast everything, do 'rm -rf gcc-native results'. The top level build directory is $LBUILD (gcc-native/oecore). The variant build directory (think -O3 vs -O2) is $VBUILD (gcc-native/oecore/$variant). The architecture directory is $VBUILD/$arch. I've left $ARCHITECTURES and $IMAGE as fallbacks so they can be overridden by the incoming job. You should implement 'get-sizes' so we track the final image and package sizes. I'd add a patch-% rule for any architecture specific patching such as using the vexpress-a9 model. Use patch-% as the fallback and the specific patch-arm for ARM specific. Add it as part of the configure. It fetches a snapshot of OpenEmbedded and bitbake. The following are snapshotted on change: * kwerner/meta-linaro * openembedded-core/denzil and end up at: http://builds.linaro.org/toolchain/snapshots/ We don't want download problems stopping us from running. The script uses my normal tactics: * Everything over HTTP * Use a in-network proxy, set in ~/.wgetrc * Pull from a mirror first or only (http://builds.linaro.org/toolchain/misc/mirror/openembedded/) Install polipo and echo http_proxy=http://localhost:8123/ > ~/.wgetrc. I've seeded the mirror. We should keep track of any extras needed such as due to other architectures. BTW, I'm wondering about doing the build in zram backed ramdisk. Might speed the build and not wear the build disk out. -- Michael

13 years, 1 month

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[ACTIVITY] April 30 - May 4

by Thiago Jung Bauermann

Hi, GDB for Android: * Reviewed Carlos O'Donell response to my message in lsb-discuss to think about the pros and cons of the approaches he mentioned, did some investigation. Maybe the ABI-tag is not needed, at least for debugging purposes (there may be other uses). * Wrote patch which detects an Android app by looking at the ELF interpreter field in the binary. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 1 month

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[ACTIVITY] April 23 - April 27

by Thiago Jung Bauermann

Hi, GDB for Android: * Struggled with creating and running a Linaro Android 2012.04 QEMU image. * Failed to set up a network between the image and the host to run gdbserver on it. * Studied how GDB copes with uclibc and dietlibc regarding the jump buffer format to compare it how Android GDB solves the problem. It turns out that they both use the same format that glibc uses so nothing is needed on GDB side. * Researched Pandaboard and accessories to purchase. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

13 years, 1 month

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[ACTIVITY] 30th April - 4th May.

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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

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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, 1 month

1
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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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 months

1
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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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 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, 2 months

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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, 2 months

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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, 2 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, 2 months

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