Interested in working with us on improving the performance of Linux on
ARM? We’re looking for motivated engineers to work in our toolchain
team on compiler technology, developer tools, and low level
performance libraries. You will use your specialised knowledge to work
in the open, work upstream, and make ARM flavoured improvements to a
range of tools that are fundamental to making the latest mobile and
server products.
We’re currently looking for:
* GCC developers
* Developer tools engineers, especially on the GNU tools like binutils and GDB
* ARM performance engineers, to work on a range of low level libraries
We’re a distributed team. Working from the home office is an option.
Please see the careers page on our website for more information and
how to contact us.
-- Michael
== GCC ==
* Committed patch to use vld1.64/vst1.64 instead of vldm/vstm
to GCC mainline and Linaro GCC 4.7
* Committed patch to use vld1/vst1 to implement vec_set/vec_extract
to GCC mainline and Linaro GCC 4.7
* Posted patch to perform 64-bit integer shifts in NEON registers
for mainline inclusion. Started to address review comments.
* Rebased patch to improve 32-to-64-bit extends from core
into NEON registers; ran into lower-subreg regression.
* Worked on implementing fix for lower-subreg regression.
* Handed over (Richard's) auto-inc-dec patches to Matt.
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
The Linaro Toolchain Working Group is pleased to announce the 2012.09
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 2012.09
* Linaro GDB 7.5 2012.09
* 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:
* gdbserver is stripped.
* gdbtui is replaced by "gdb --tui"
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/2012.09
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.
Summary
* Prepare Linaro binary toolchain 2012.09 release
* Fix lp:1036170/pr50970
Details:
1. Prepare Linaro binary toolchain 2012.09 release
* Update linaro gcc and gdb to 2012.09 release
* Workaround gdb lsb build issue.
* Strip gdbserver.
* Smoke tests.
2. Merge shrink-wrap patch to lp:gcc for cbuild test. But dwarf checks
fail when building fortan related codes at stage 2.
3. Identify the root cause of lp:1036170/pr50970 and work out a patch to fix it.
Plans:
* Linaro binary toolchain 2012.09 release.
* Fix shrink-wrap build fail issues.
Planed leaves:
* Sept. 30 - Oct. 7: Mid-Autumn Festival and National Day of China's holiday.
Best regards!
-Zhenqiang
== Progress ==
* Discussed big-endian patches for vext tests: careful review of the
specification is required and this patch might actually expose GCC
bugs in big-endian/Neon.
* builtin_bswap16:
* Posted 2 implementations of the generic patch for
(x<<8)|(x>>8). The 2nd one looks OK, but I was asked to make some
checks on powerPC, which are on-going.
* backporting it to Linaro/4.7. On-going: merged obvious patches but
one test does not produce the same code as on trunk.
* validations in cbuild in with GCC configured for thumb and hard FP
showed that some bswap16 tests fail because they force armv6,
which leads to unsupported thumb1 configuration. Proposed
testsuite modification to make this easier, under discussion with
Matt & Richard.
== Next ==
* builtin_bswap16:
* check powerPC results and have the patch accepted upstream.
* measure probable regression in libav when using the builtin
instead of an asm().
* complete backport in Linaro/4.7.
* PGO/hot-cold partitioning: start working on this blueprint.
== Progress ==
* Fixed
https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/1029454
* After investigating further found that this was actually an issue
already fixed in FSF upstream
* 4.7 AArch64 merge into gcc-linaro/4.7
* Did an initial merge of upstream ARM/aarch64-4.7-branch into gcc-linaro/4.7
* So far it hasn't broken other platforms
* Investigated getting FastModels working for me
* Hot/Cold partitioning in PGO:
* Tidied up current patches ready for reposting upstream
* Handed current status to Christophe
== Next Week ==
* HOT/COLD partitioning for PGO:
* Complete hand-over to Christophe
* Get two current patches accepted upstream
* Post question upstream about register allocation 'mistakes' I am seeing
* ARM/aarch64-4.7-branch merge into gcc-linaro/4.7.
* Get a test run of aarch64 targetted compiler complete
* Confirm no code generation changes for other back-ends
* symbol_ref splitting
* Test code alignment hypothesis
* Test v2 patch.
* Admin
* Several interviews
== Future ==
* Look at Cards for Vectorization, PGO and LTO with Michael.
--
Matthew Gretton-Dann
Linaro Toolchain Working Group
matthew.gretton-dann(a)linaro.org
Current Milestones:
|| || Planned || Estimate || Actual ||
|| clean up kvm-qemu cp i/f || 2012-09-20 || 2012-09-20 || ||
|| fake-trustzone || 2012-10-15 || 2012-10-15 || ||
Also planned: general keeping up with kernel changes; upstream patch
review; qemu-linaro releases. May change dates to align with overall
KVM plan for the quarter when that is finalised.
Previous Milestones:
||cp15-rework || 2012-01-06 || 2012-06-23 || 2012-06-24 ||
||a15-lpae-support || 2012-07-13 || 2012-07-20 || 2012-07-20 ||
== track-kvm-abi-changes ==
* folded in Christoffer's interrupt ABI changes
* updated to new ONE_REG ABI for register accesses
* QEMU now in sync with the kernel patchset Christoffer has just sent to alkml
== other ==
* qemu-linaro 2012.09 released
* various meetings/status calls
KVM blueprint progress tracker:
http://ex.seabright.co.nz/helpers/backlog?group_by=topic&colour_by=state&pr…
Summary
* Workaround the unwind issue for shrink-wrap
* Verify Linaro tickets.
Details:
1. Debugging the failed cases for shrink-wrap. To workaround the
unwind issue, update arm_expand_epilogue to generate return not
simple_return when sp is changed.
2. Setup Linaro toolchain and verify 8 tickets:
*Linaro gcc:
lp:1036170: Function pointer dereferenced twice. It is ARM special bug
which is confirmed in 4.6, 4.7 and FSF trunk only on ARM.
lp:1048709: wrong assembler, out of range vldr instruction. Confirmed
in Linaro 4.6. Can not reproduce it in 4.7 or FSF 4.6.
lp:1014658: It is c++11 related issue in 4.6.
lp:944572: It is a gcc general issue.
lp:972503 and lp:1039401 can not be reproduced.
* Linaro binary toolchain:
lp:1046718: confirmed and fixed it.
lP:1049498: invalid
Plans:
* Prepare Linaro binary toolchain 2012.09 release.
* Performance test for shrink-wrap.
* Follow-up the tickets.
Best regards!
-Zhenqiang
== Progress ==
* Committed patch to fix 3 testcases in big-endian after upstream comments.
* Updated patch to make vext tests support big-endian after upstream comments.
* builtin_bswap16:
* Committed implementation for ARM.
* Investigating testsuite regressions caused by my patch to catch
(x<<8)|(x>>8)
== Next ==
* Continue with bswap16 support.
== Progress ==
* Started looking at
https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/1029454
* Confirmed the failure
* Unfortunately the git bisect I thought would find the fix didn't
* Hot/Cold partitioning in PGO:
* Some further investigations
* Talked to Uli about one failure - he gave me some further pointers
* Admin
* Some interviewing
== Next Week ==
* Continue looking at 1029454: cselim tree optimizer generates incorrect code
* Start looking at merging the ARM public 4.7 GCC branch into gcc-linaro/4.7
* Hot/Cold Partitioning:
* Investigate remaining silent code-gen faults and non-termination
issue in SPEC
* If failures are fixed start profiledbootstraps and tests on the
central boards.
* symbol_ref splitting
* Test code alignment hypothesis
* Test v2 patch.
== Future ==
* Look at Cards for Vectorization, PGO and LTO with Michael.
--
Matthew Gretton-Dann
Linaro Toolchain Working Group
matthew.gretton-dann(a)linaro.org
