linaro-toolchain February 2012

linaro-toolchain@lists.linaro.org

21 participants
51 discussions

by Michael Hope

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

12 years, 9 months

Running benchmark variants

by Michael Hope

Here's brief notes on running different benchmark variants across the auto builders. Asa, could you pull these plus your notes into a wiki page? Spawn a job: http://ex.seabright.co.nz/helpers/scheduler/spawn Merge requests are automatically built. Otherwise, drop arbitrary tarballs into cbuild@orion:~/snapshots and spawn <tarball name minus extension>. For example, scp gcc-4.6.3.tar.gz cbuild@orion:~/snapshots; spawn gcc-4.6.3 into a9-builder. Jobs: * gcc-version - build and test GCC * benchmarks-gcc-version - run coremark, denbench, eembc against the already built version * benchmarks-spec2000-gcc-version - run spec2000 Queues: * a9-builders: anything that can naive build a A9 compiler * a9-ref: reference A9 boards * a8-ref: reference A8 boards Variables: * BENCHMARKS = list, such as coremark spec2000 pybench - run these benchmarks instead of the defaults Variants: * By default we build o3-neon * See http://bazaar.launchpad.net/~linaro-toolchain-dev/cbuild/trunk/view/head:/l… for all names * Spawn a job with VARIANT_SRC = all and VARIANT_LIST = glob-pattern Examples: * VARIANT_LIST = o3-neon o3-vfpv3 (compare NEON with VFPv3D32) * VARIANT_LIST = o3-neon-cortexa8 o3-neon-cortexa9 (compare -mtune=cortexa8 vs -mtune=cortexa9( * VARIANT_LIST = o3-neon-novect o3-neon (compare with/without the vectoriser) -- Michael

12 years, 9 months

Cards

by Michael Hope

Hi Ken, Thiago. Could you try your hand at writing cards for the OpenEmbedded Core meta-layer and GDB and Android? Here are some past cards: https://linaro-public.papyrs.com/TCWG2011-GCC-O3 https://linaro-public.papyrs.com/TCWG2011-OPENOCD-SUPPORT https://linaro-public.papyrs.com/TCWG2011-WINDOWS-TOOLCHAIN They cover: * An introduction * The why/advantages * The what/features * The how/steps * Dependencies * Acceptance criteria (which is a post-tense version of the body) A card should cover three calendar months. Check the unknowns - we need to investigate the acceptance criteria and make sure there is no unexpected side work in there. We use roadmap cards as the highest level of organising our work. Cards are the interface between working groups and the TSC and sit at the project brief / deep but concise level. Draft them on the wiki (cf https://wiki.linaro.org/KenWerner/Sandbox) and we'll go from there. -- Michael

12 years, 9 months

Please pull upstream rev. 184603 into gcc-linaro 4.7

by Bernhard Rosenkränzer

Hi, 184603 fixes an ICE we're running into with Android test builds. Please pull it in ASAP so I don't have to mess with the CFLAGS as a workaround. ttyl bero

12 years, 10 months

Cross toolchain for lucid updated

by Marcin Juszkiewicz

Linaro cross toolchain backport PPA [1] got updated to recent Ubuntu 12.04 versions: - gcc 4.5.3 - gcc 4.6.2 - binutils 2.22 - eglibc 2.15 - linux 3.2 I tested both compiler versions against few packages, U-Boot and Linux 2.6.32. Those packages may also work under Ubuntu 10.10 'maverick' and 11.04 'natty' but it was not tested. Users of Ubuntu 11.10 'oneiric' may install libmpfr1ldbl package [2] and then use 'lucid' repository to install cross compiler while I will prepare packages for their version of Ubuntu. Please report any problems with those backported packages in launchpad [3][4][5]. 1. https://launchpad.net/~linaro-maintainers/+archive/toolchain 2. http://packages.ubuntu.com/lucid/libmpfr1ldbl 3. https://launchpad.net/ubuntu/+source/gcc-4.5-armel-cross/+bugs 4. https://launchpad.net/ubuntu/+source/gcc-4.5-armel-cross/+bugs 5. https://launchpad.net/ubuntu/+source/armel-cross-toolchain-base/+bugs

12 years, 10 months

Spec 2000 broken?

by Andrew Stubbs

Hi Michael, I ran the benchmark tests on GCC 4.7, but the spec2000 run seems to have failed. This is both on the baseline, and on my patch. See here: http://ex.seabright.co.nz/benchmarks/gcc-linaro-4.7%2bbzr114968~ams-codesou… Andrew

12 years, 10 months

Saturated operations

by Michael Hope

Hi Ulrich. The saturated work you're doing at the moment - is it the saturated add/subtract QADD/QSUB/QDADD/QDSUB or the ARMv6 saturate-word-with-shift SSAT/USAT? I've updated the old blueprint and added a new one for SSAT/USAT: https://blueprints.launchpad.net/gcc-linaro/+spec/armv6-saturation-instruct… https://blueprints.launchpad.net/gcc-linaro/+spec/armv5-saturated-ops and was wondering which to put against your name. -- Michael

12 years, 10 months

Fleshing out the QEMU blueprints

by Michael Hope

Hi Peter, Rusty. I've fleshed out the KVM blueprints a bit more at: https://wiki.linaro.org/MichaelHope/Sandbox/Q1.12ToDo Notable is adding validation and de-PENDING a few things. I need to know the following things before talking to Validation and Platforms about things that are in their queue: * What's the host kernel? Christoffers, or a linux-linaro-kvm based off his plus work in progress? * What's the guest kernel? * Anything special that needs to be in the host rootfs outside qemu and libvirt? Do you have a host and guest kernel .config that I can pass on to Platforms? -- Michael

12 years, 10 months

[ACTIVITY] Feb 20 - Feb 24

by Thiago Jung Bauermann

Hi, GDB on Android: * Set up cross compiling environment using both the Android toolchain and the Linaro toolchain. * Tested Android and Mozilla GDB running as a native binary on the Linaro Android image on qemu. None of them were able to see all threads in a multi-threaded process. The same happens with a native binary on Android talking to a gdbserver on localhost. * I was able to produce an Android GDB 7.1.x binary which when running on an i386 host talking to the Android SDK emulator sees all threads. It is not able to generate a backtrace though. * Carnival holidays. -- []'s Thiago Jung Bauermann Linaro Toolchain Working Group

12 years, 10 months

[ACTIVITY] 20th - 24th February

by Andrew Stubbs

Investigated and produced and patch for bug lp936863. Continued work on 64-bit shifts. I updated my neon shifts patch twice: once to take -Os optimization into account, and once because I noticed that the CC clobbers were being retained even after they were known to be not required, and presumably this could be a bad thing. Posted a patch to improve SI->DImode sign- and zero-extends that also move values from core registers to neon registers. Wrote a patch to implement negation in neon register, albeit at the cost of a scratch register to hold the constant zero. This worked, but insisted on loading the zero from memory, despite the fact that NEON has a suitable instruction for loading zero. Attempted to get "vmov dN, #0" to work. The problem appears to be that DImode loads are handled by the VFP load pattern in vfp.md and that that doesn't seem to DTRT for integer constants. I've got as far as trying to figure out what it does do, but there's more to be done to get to the bottom of the problem. Tried to get the benchmarking going for 64-bit shifts. Unfortunately ursa1 has been experiencing outages. Michael has been trying to fix it, but so far I've not been able to run anything there. Instead, I've launched benchmark runs via Michael's normal test infrastructure. Hopefully this can replace the manual ones anyway. That would be more convenient.

12 years, 10 months

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linaro-toolchain February 2012