== String routines ==
* Working through updating my eglibc patch for memchr, I think I'm
nearly there - took way too long
to persuade an eglibc make check to work cross (can't get native
build happy).
== QEMU ==
* Sent a new version of my QEMU patch for the atomic helpers to Peter.
* Tested the Android beagle image on a real beagle - it fails in
pretty much the same way as the
QEMU run.
== Other ==
* Had a brief look at bug 825711 - scribus ftbfs on ARM - this is QT
being built to define qreal as
float on ARM when it's double on most other things, scribus
having a qreal variable and something
it's defined as a double and then passing it to a template that
requires two arguments of the same type;
not really sure which one is to blame here!
I'm on holiday next week.
Dave
== GDB ==
* Created and published Linaro GDB 7.3 2011-08 release.
* Analyzed --with-sysroot=remote: testsuite failures,
and opened bug LP #829595.
* Reviewed Yao's latest Thumb-2 displaced stepping patch.
== Schedule ==
* I'll be on vacation 08/23 through 08/31.
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
Hi,
* continued to work on getting libunwind support for remote unwinding
upstream
* reworked some of the code to address concerns from the ml
* now upstream!
* made smaller fixes to have another libunwind testcase passing
* interfaced with the Linaro Android group to solve an issue where a
compile was failing when using -O3
* turned out that the Linaro GCC vectorizes a loop by generating some
neon instructions
* unfortunately the gas of the 2.20.1 binutils (that is currently
used by the Linaro Android toolchain) doesn't properly understand the
alignment restrictions of the generated asm code and throws an error
* this has be fixed upstream and using a gas from recent binutils
fixes the issue
* Bernhard is already working on getting newer binutils in their
Androuid toolchain build system
* continued the work to get libunwind building on Linaro Android
* wrote an Android.mk and got an initial libunwind.so built (ugly
hacks involved)
* next step is modify the debuggerd to make use of libunwind.so
Note: Next week I'll be on vacation.
Regards
Ken
== This week ==
* Looked at LP #823711. Turned out to be a problem with symbol
visibility in libgcc.a. Tested a fix that was accepted and applied
upstream. Will backport to upstream release branches, so we should
be able to pull the fix in that way.
* Backported the fix for BZ PR49987 to Linaro 4.6 and 4.5.
* Looked at the regrename bug that Ramana reported on gcc@.
* Looked at why libav wasn't being vectorised. Discussed with Ira.
I think we now have a Plan.
* Submitted address writeback scheduling patches upstream.
* Submitted and applied some tweaks to the rtx cost interface upstream.
* Spent a while trying to figure out what the targetm.rtx_costs
API actually is, and how rtx_cost should use it to evaluate the
cost of a SET. Discussed on gcc@.
* Found that ARM was giving SETs a base cost of 4 instructions.
Benchmarked the cost of "fixing" this. It generally seemed positive.
* Wrote a couple of other rtx cost patches.
== Next week ==
* Backport fix for #823711 to upstream branches.
* Hopefully finish off rtx costs stuff.
* Unless there's a clear outcome from the gcc@ discussion, I think
I'll abandon my idea of using insn_rtx_cost in the new auto inc/dec
patch, and simply sum the cost of every SET. Should be a small change.
Richard
* Started running EEMBC on Panda. Got three errors in the automotive test at
this point.
* Started documenting necessary steps for my start-up task:
https://wiki.linaro.org/Internal/ToolChain/Benchmarks/First%20time%20notes
* Upgraded the Snowball board to the latest version (V3). Created a
corresponding test image for Snowball (Linaro 11.06). There is a problem
with the serial console freezing after a couple of minutes without any
error, not sure if it is a complete crash or just the serial output. The
people I have talked to so far has not experienced the same problem. I will
set up the networking for the board and see where ssh gets me.
Best Regards
Åsa
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
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
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
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
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
