linaro-toolchain

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16 participants
5736 discussions

by Ira Rosen

Hi, - change of default vector size for auto-vectorization on NEON - submitted and approved - continued working on vectorization of widening shifts - looked into SLP vectorization for libav - two vacation days I'll be on vacation on Aug 22-30. Ira

14 years, 10 months

Basic libav profiling

by Michael Hope

I put a build harness around libav and gathered some profiling data. See: bzr branch lp:~linaro-toolchain-dev/+junk/libav-suite It includes a Makefile that builds a C only, h.264 only decoder and two Creative Commons licensed videos to use as input. README.rst has the basic commands for running ffmpeg and initial perf results showing the hot functions. Dave, 20 % of the time is spent in memcpy() so you might want to have a look. The vectoriser has no effect. GCC 4.5 is ~17 % faster than 4.6. I'll look into extracting and harnessing the functions themselves later this week. -- Michael

14 years, 10 months

Is the Linaro toolchain useful on x86/x86_64?

by Bernhard Rosenkranzer

Hi, is the Linaro toolchain (esp. gcc) useful on x86/x86_64, or is an attempt to use the Linaro toolchain with such a target just asking for trouble? (No, I'm not secretly an Intel spy ;) Just trying to have some fun with my desktop machine ;) ) ttyl bero

14 years, 10 months

Linaro GDB 7.3 2011.08 released

by Ulrich Weigand

The Linaro Toolchain Working Group is pleased to announce the release of Linaro GDB 7.3. Linaro GDB 7.3 2011.08 is the first release in the 7.3 series. Based off the latest GDB 7.3, it includes a number of ARM-focused bug fixes. This release includes all bug fixes from the latest Linaro GDB 7.2 release that were not already included in FSF GDB 7.3. In addition, this release fixes: * LP: #804401 [remote testsuite] Thread support * LP: #804387 [remote testsuite] Shared library test problems * LP: #804392 [remote testsuite] Rebuilt executables not copied * LP: #804396 [remote testsuite] Spurious failures The source tarball is available at: https://launchpad.net/gdb-linaro/+milestone/7.3-2011.08 More information on Linaro GDB is available at: https://launchpad.net/gdb-linaro

14 years, 10 months

Linaro QEMU 2011.08 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2011.08. Linaro QEMU 2011.08 is the latest monthly release of qemu-linaro. Based off upstream (trunk) QEMU, it includes a number of ARM-focused bug fixes and enhancements. This month's release is primarily minor improvements: - Fixes LP:816791: ARMv6 cp15 barrier instructions now work in linux-user mode as well as system mode - Support for ARM1176JZF-S core has been added (thanks to Jamie Iles <jamie(a)jamieiles.com>) - Add workaround for kernel bug LP:727781 (which has resurfaced in 3.0) to suppress warnings about bad-width omap i2c accesses Plus of course new upstream fixes and improvements. Performance: When running qemu in system mode with an SD card image we have determined that performance is best when the image is in writeback caching mode. This significantly increases the performance of the SD card (by factors of 10 or more). An example command line option is: -drive if=sd,cache=writeback,file=my-sd-card.img Note that cache=writeback may result in data not being written to disk if the host system powers down unexpectedly (guest crashes or powerdowns are not a problem). Known issues: - The beagle and beaglexm models still do not support USB networking - There may be some problems with running multithreaded programs in linux-user mode (LP:823902) The source tarball is available at: https://launchpad.net/qemu-linaro/+milestone/2011.08 Binary builds of this qemu-linaro release are being prepared and will be available shortly for users of Ubuntu. Packages will be in the linaro-maintainers tools ppa: https://launchpad.net/~linaro-maintainers/+archive/tools/ More information on Linaro QEMU is available at: https://launchpad.net/qemu-linaro

14 years, 10 months

Linaro GCC 4.6 and 4.5 2011.08 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2011.08 release of both Linaro GCC 4.6 and Linaro GCC 4.5. Linaro GCC 4.6 2011.08 is the sixth release in the 4.6 series. Based off the latest GCC 4.6.1+svn177703, it focuses on fixing bugs found during the Android integration and in SMS. This is a quiet release due to Linaro Connect. Interesting changes include: * Updates to 4.6.1+r177703 Fixes: * LP: #736007 ICE immed_double_const at emit-rtl.c * LP: #809768 ICE when compiling bionic's libm * LP: #815777 Inconsistent packaging between tarball and root directory names Linaro GCC 4.5 2011.08 is the thirteenth release in the 4.5 series. Based off the latest GCC 4.5.3+svn177552, the release is focused on maintenance. Interesting changes in 4.5 include: * Updates to 4.5.3+r177552 * Now builds for PowerPC Fixes: * LP: #736007 ICE immed_double_const at emit-rtl.c * LP: #809768 ICE when compiling bionic's libm * LP: #815435 ICE: insn does not satisfy its constraints The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.6-2011.08 https://launchpad.net/gcc-linaro/+milestone/4.5-2011.08 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro 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

14 years, 10 months

Improving libgmp [was: Re: Potential tools team work]

by Michael Hope

On Thu, Aug 18, 2011 at 4:16 AM, Richard Earnshaw <Richard.Earnshaw(a)arm.com> wrote: > I was just browsing libgmp this afternoon and noticed that it really > could do with an overhaul to support recent ARM chips. > > The ARM code seems to have been written for StrongARM; which is now > almost obsolete (for example, it loads from a cache line it is about to > write to in order to pre-allocate the line in the cache). > > It doesn't support v4T interworking. > > It doesn't make any use of v5 or later instructions. > > There is some Thumb(1) code, but again it has no support for > interworking, is pretty poor and limited in scope. > > I'm not sure overall how useful this is to gcc performance; the library > is needed to build GCC, but I think it's mostly there to support libmpfr. > > Nevertheless, there are other apps out there that make use of this > stuff, including some crypto code, IIRC. I looked at using gmp as a benchmark some time ago. The assembly version is twice as fast as the C version already, which is nice. I assume NEON would be a big improvement as well. I had a quick poke through the dependencies in Ubuntu and came up with the following popular packages that use libgmp or libmpfr: * guile * python-crypto * gch (Haskel) * maxima * darcs Nothing earth shattering but probably worthwhile. I've registered: https://blueprints.launchpad.net/linaro-toolchain-misc/+spec/improve-libgmp so that we don't lose it. -- Michael

14 years, 10 months

Branch is open

by Michael Hope

Hi there. The 2011.08 release has been spun and is testing up well. The 4.5 and 4.6 branches are now open so feel free to commit any approved patches. -- Michael

14 years, 10 months

Re: What are the chances of a phone based developer image

by Ramana Radhakrishnan

> . Would you be interested in adding a Firefox-based benchmark? As a large > application it is a good testbed for LTO, FDO and other aggressive > optimizations. Sorry about the delayed response. I did notice your mail last week but I was busy with our conference and then the first couple of days this week have just disappeared with some internal training. I would be interested in hearing how you get on with LTO and FDO on ARM. Listening to Honza talking at the GCC unconference in London about the memory usage for full LTO with trunk I did wonder what would happen if we tried it on the ARM target to see what we got, but I never managed to get around to trying anything there :) . We did look at getting FDO working with Linaro GCC last cycle but there are still a couple of issues with PGO in Linaro GCC 4.5. With respect to LTO , the one problem we have currently is that the Neon intrinsics aren't streamed out and streamed back in. So you might have a few issues if your code uses arm_neon.h . https://bugs.launchpad.net/gcc-linaro/+bug/823548 is an example of this problem. This was fixed upstream and we probably just need to backport that into our 4.6 tree. I've tried a backport this morning and I think I have this right finally. If you could do a build and a firefox benchmark run in about 30-60 minutes by all means please do let us know how you get on and what you find. We've been steadily trying to improve the performance of the ARM toolchain and the biggest improvements you'll notice will be with the vectorizer but there will be other small improvements that you'll notice in other general areas of code generation. We would be interested in feedback about what can be done and to add to our queue of things to look at and improve for the ARM port of GCC. With respect to the images, Kiko's probably answered that bit. cheers Ramana

14 years, 10 months

[ACTIVITY] 8th - 12th August.

by Andrew Stubbs

* GCC Continued tracking down problems in my various broken patches. Fixed one bug, investigated two more. Re-submitted the widening multiplies for testing, and this time it returned with no problems. Yay, I can now check it in next week. Merged from upstream GCC 4.5. The launchpad import bug still exists (although should not for much longer) so I had to ask on #launchpad to get the imports done. Submitted the merged branch for testing. Tried to merge GCC 4.6 similarly, but failed. Bzr just refused to play ball, which was very frustrating. Michael Hope has now done the merge instead. * Other On leave Wednesday and Friday.

14 years, 10 months

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