== GDB ==
* Committed follow-on patch to fix cosmetic issues resulting from
the remote "info proc" patch set.
== GCC ==
* Created 4.6 backport branch including Richard's subreg forward-
propagation branch, the modes-tieable patch, and the combine.c
regression fix, and evaluated for correctness and performance.
Investigation of performance regressions uncovered a problem in
the register allocator: tied subregs (validly) cause somewhat
larger register pressure in certain cases, and this caused the
4.6 IRA to generate spills. Note that the 4.7 IRA is still
able to allocate every pseudo in the very same code; this is
a result of Vladmir's significant IRA rewrite in 4.7 ...
* Investigated Ramana's vld1 patches, and a problem with excessive
vmov's in the PR 51819 test case pointed out by Ramana. It turns
out that when we extract a lane from a vector to memory using an
offsetted address, we move the value through a core register
instead of simply computing the address and using vst1.
I'm working on a patch to address this.
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
RAG:
Red:
Amber:
Green:
Current Milestones:
|| || Planned || Estimate || Actual ||
||cp15-rework || 2012-01-06 || 2012-02-20 || ||
||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04?|| ||
(for blueprint definitions: https://wiki.linaro.org/PeterMaydell/QemuKVM)
Historical Milestones:
||a15-usermode-support || 2011-11-10 || 2011-11-10 || 2011-10-27 ||
||upstream-omap3-cleanup || 2011-11-10 || 2011-12-15 || 2011-12-12 ||
||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 ||
== cp15-rework ==
* discussions with Rusty
== qemu-kvm-getting-started ==
* wrote patches for the A15 Fast Models boot-wrapper that allow you
to pass the kernel/initrd/kernel command line via a parameter to
the model rather than having to hard code them into an ELF file
along with the boot-wrapper. This should make life a lot easier for
the validation folk.
* various discussions with validation/etc about what you can and
can't do with a model and what the best setup is going to be
* sorted out a Debian fs to use for KVM guest : this is needed because
the kernel module doesn't do Thumb or VFP yet.
* started on rearranging and improving the writeup/HOWTO on the wiki
== other ==
* target-arm/arm-devs queues pushed upstream [Calxeda Highbank model
is now in upstream QEMU]
* helping Will Deacon track down what looks like a race condition in
Linux's handling of VFP on SMP where signal handlers are involved
* a QEMU Object Model patch series has landed upstream -- this will
be a nasty rebase for qemu-linaro next week I think
Hi!
* -o2/-o3 benchmarking:
Worked on and shared charts for the -o2/-o3 benchmark runs with
gcc-linaro-4.6-2012.01. I have created charts for both the score of the
benchmarks and the sizes (text segment) of the executables. Making
improvements continuously as I get feedback from the team.
The charts are stored in GoogleDocs:
https://docs.google.com/a/linaro.org/leaf?id=0B1IP4dZWVaxZOGZlM2UwMGQtOGQyZ…
* gcc4.7 benchmarking:
Did benchmark runs on a late revision of gcc4.7.
Next week I will process the data and list regressions/improvements against
gcc4.6.2 and gcc-linaro-4.6-2012.01.
* v8:
Investigated possibility of running SunSpider stand-alone on the v8 engine.
Found out that there is a stand-alone driver included in WebKit.
Have built v8 on x86 and ARM (on ARM it takes ~18 min) and run SunSpider
and the v8 benchmark suite.
Next step I will try to build with another toolchain. It is not Make but
SCons that controls the build, so I am not sure how to do that.
https://wiki.linaro.org/AsaSandahl/Sandbox/JavaScriptBenchmarks
* Bug triaging:
I have triaged all "easy" ones in the list of new tickets. Michael will
help me look through the rest of new and incomplete bugs which are mostly
old ones (waiting for someone to take some action) or very tricky ones.
Regards
Åsa
On Wed, Jan 25, 2012 at 7:02 AM, Ulrich Weigand
<Ulrich.Weigand(a)de.ibm.com> wrote:
>
> Hi Michael,
>
> GDB 7.4 has finally been released. What do we need to do to get the
> 7.4-branch imported into Launchpad? I think last time (for 7.3) you did
> that somehow ...
Done as:
lp:~linaro-toolchain-dev/gdb/7.4
and documented at:
https://wiki.linaro.org/MichaelHope/Sandbox/GDBImport
-- Michael
Peter, could you review:
https://wiki.linaro.org/WorkingGroups/ToolChain/QEMUARMGuestQ411
please? I'm interesting in anything I've missed or exaggerated. The
audience is the TSC or people outside Linaro who are interested in a
summary of the changes.
-- Michael
Hi Zygmunt. I've enabled the ARM native build on the QEMU auto
builders. These are built in the validation lab on the Natty based
tcpanda boards and end up on control under
~cbuild/cbuild/build/qemu-$version/qemu-$something.tar.xz.
I've uploaded this build to
http://people.linaro.org/~michaelh/incoming/qemu-armv7l-natty-cbuild236-tcp….
There's something wrong with embedding of the version number into the
name. A quick 'does it run' test passes.
Peter, could you check the configure log at:
http://builds.linaro.org/toolchain/qemu-linaro-0~20120118+gitcc8661e/logs/a…
and see if there's anything missing.
The auto builders fire with each commit so there's always something up
to date. You can list the builds at:
http://ex.seabright.co.nz/helpers/buildlog/qemu
and see the raw results at:
http://builds.linaro.org/toolchain/qemu-linaro-0~20120118+gitcc8661e/logs/a…
(after a lag)
-- Michael
---------- Forwarded message ----------
From: Linaro Toolchain Builder <michael.hope+cbuild(a)linaro.org>
Date: Thu, Jan 26, 2012 at 11:14 AM
Subject: [cbuild] qemu-linaro-0~20120118+gitcc8661e armv7l completed
To: "linaro-toolchain-builds(a)lists.launchpad.net"
<linaro-toolchain-builds(a)lists.launchpad.net>
tcpanda05 finished running job qemu-linaro-0~20120118+gitcc8661e on
armv7l-natty-cbuild236-tcpanda05-cortexa9r1.
The results are here:
http://builds.linaro.org/toolchain/qemu-linaro-0~20120118+gitcc8661e
9 PASS 9 TEST
This email is sent from a cbuild (https://launchpad.net/cbuild) based
bot which is administered by Michael Hope <michael.hope(a)linaro.org>.
The Linaro Toolchain Working Group is pleased to announce the 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.
This is the first release. Releases will be made each month shortly
after the corresponding source release.
Uses include:
* Cross compiling ARM applications from your laptop
* Remote debugging
* Build the Linux kernel for your board
What's included:
* Linaro GCC 2012.01
* Linaro GDB 2011.12
* 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.
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/2012.01
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
On Wed, Jan 25, 2012 at 2:33 AM, Ulrich Weigand
<Ulrich.Weigand(a)de.ibm.com> wrote:
>
> Michael, Åsa,
>
> as discussed in today's performance call, the 4.6 backport of Richard's
> sched-pressure enhancements is available here:
> https://code.launchpad.net/~rsandifo/gcc-linaro/alt-sched-pressure-4.6
>
> To activate the feature, you need to use the options:
>
> -fsched-pressure -fsched-pressure-algorithm=model
Åsa, I think we're ready to spawn benchmark jobs through the build
farm. I've made a front end:
http://ex.seabright.co.nz/helpers/scheduler/spawn
to make it a little easier to use. To spawn a benchmark run, enter a
job called benchmarks-<buildname> such as
benchmarks-gcc-linaro-4.6+bzr106857~rsandifo~alt-sched-pressure-4.6
and spawn it into the 'test' queue. See the page for how to change
the flags and benchmarks that are run.
The results end up at:
http://ex.seabright.co.nz/benchmarks/
which needs the password from:
https://wiki.linaro.org/Internal/ToolChain
I've spawned Ulrich's job into the queue as a test run. Let's see how
it goes. If it works, you can spawn the ancestor
(benchmarks-gcc-linaro-4.6+bzr106856) and later do a diffbench on the
results.
-- Michael
Hi,
I am looking at ticket 739305 "[armhf] libffi variadic support"
which still has status "New" for Linaro gcc.
https://bugs.launchpad.net/ubuntu/+source/libffi/+bug/739305
If I understand correctly, David's patch is included in libffi in Oneiric,
but not yet backported to Linaro gcc?
What is the correct thing to do with this ticket for Linaro GCC?
I was thinking it could be set to "Triaged", waiting for an appropriate
time to backport.
Regards
Åsa
Spotted this in a Phoronix article today:
Overall it seems that most of the computational tests are performing
better with the newer Ubuntu 11.10 and 12.04 user-space packages,
which upgrades the GNU Compiler Collection to the 4.6 series over
the 4.5 release found in Ubuntu 11.04. The 4.6 compiler upgrade with
greater ARMv7 architecture enhancements is likely what can be
attributed to most of the performance improvements found in this
article. [...]
See the results for yourself at:
http://www.phoronix.com/scan.php?page=article&item=nvidia_tegra2_ubuntu&num…
Good job,
--
Christian Robottom Reis, Engineering VP
Brazil (GMT-3) | [+55] 16 9112 6430 | [+1] 612 216 4935
Linaro.org: Open Source Software for ARM SoCs
