Merged both GCC 4.5 and 4.6 from FSF to Linaro. Matthias requested that
I avoid a particular upstream 4.6 commit, so I selected the revision
before that as the merge point. The problem was then fixes upstream, and
another fix was desirable, so I've redone the merge from the branch head.
Another widening-multiplies bug was reported to me (I logged it as
pr50318/lp843775), so I've fixed that and committed the fix upstream,
and filed a merge request on Launchpad.
Finished fixing the bugs in my thumb2 constants optimizations, and
backported the new patches to Linaro GCC 4.6. Pushed the updated stuff
to Launchpad for testing.
Richard Sandiford found a flaw in my patch for pr50193/lp836401, so I've
done another version of that and posted it upstream. Ramana didn't like
that version. I've started again trying to fix it a different way, but I
don't have it working just yet.
Continued work on my new constant reuse patch. I have it detecting many
constant expressions, and calculating the values for some of them. Once
it does that sufficiently well, the next step is to track what constants
are available where, I then I'll be in a position to find optimization
opportunities. At the moment, 'sufficiently well' could just mean
MOVW/MOVT pairs, as those are the most common
Tried to get the CS Panda Boards up and running again after the move. No
success. Ricardo is on the case. I'm still using the boards located at
Canonical.
Andrew
Continue looking at Richard's micro benchmarks taken from libav w.r.t
SMS and experiment with different patches that Richard wrote to
improve code generation.
Submitted SMS related patch for minor misc fixes
http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00551.html
Trying to understand why to new version of the patch to support
instructions with
REG_INC_NOTE in SMS causes bootstrap failure. Will email to the ml regarding it.
(http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html)
* Looked at LP bug 736661. Sent a patch upstream. Some positive feedback,
but it hasn't been approved or rejected yet.
* Looked at the old R_ARM_THM_CALL linker bug, after Matthias prepared
a self-contained testcase (thanks). Attached a patch to the bug.
Will submit upstream next week if testing goes OK.
* Looked at why the backport of lp823708-4.5 retriggered the same
bootstrap failure that Chung-Lin's patch did. Haven't been able
to reproduce yet.
* Looked at making the neon_vget_high/low patterns use ordinary
subreg moves. Found that this triggered a fair few latent bugs
in the rtl optimisers. Tried to fix those. This gave some nice
improvements in some of the libav loops.
* Added h264 loops to the libav microbenchmarks.
* Blueprints.
* Upstream patch review.
Richard
* Completed First-time wiki page, at least for now. Expecting to add more
information as I go.
* Running SPEC2K on the Snowball board. The tests are failing because I run
out out of memory. This is due to too little RAM available in the default
kernel configuration. (Official HW pack.) I had a go with creating a swap
file on the SD-card. The tests are then running, but results are slow (which
makes sense). Will try to make more memory available with changed
uboot-option, or with a fresh kernel.
* Discussing with Michael about benchmark candidates that will add a web
browsing perspective to the benchmarks we have. I suggest Sunspider and V8
benchmark suite for the JavaScript aspect, and EEMBC Browsing Bench and
perhaps ARMBBench for the load and render aspect. As for the imaging aspect
we have DENBench and ConsumerBench.
Best Regards
Åsa
== String routines ==
* Trying to understand my strlen behaviour that Michael identified
- Found lots of ways of making the faster case slower, but none of making
the slower case faster!
- Perf not being available on Panda (bug 702999/843628) made it
difficult to
dig down
* Fixing standards corner cases for strchr/memchr
- input match needs to be truncated to char (fixes bug 842258 & 791274)
* Tidying up formatting for cortex-strings release
* Looking at eglibc integration again
- getting confused by what has to happen in config.sub and how
other users of it
cope with triplets like armv7 even though it's not in config.sub
== QEMU ==
* Testing Peter's QEMU release
- All good
- Lost a few hours due to the broken version of l-i-f-ui in Oneiric
- PPA version works OK
* A little bit of perf profiling
== Other ==
* Managed to get hold of a nice fast build machine
== GDB ==
* Worked on hardware watchpoint support for gdbserver.
== GCC ==
* Analyzed root cause of three more ICEs when building Linux
kernel with mainline GCC (reported by Arnd):
PR target/50305: Inline asm reload failure when building Linux kernel
PR middle-end/50307: SSA checking ICE when building Linux kernel
PR tree-optimization/50318: ICE optimizing widening
multiply-and-accumulate
* Implemented proposed fix for PR target/50305 and posted for review.
== Misc ==
* Installed updated FPGA bitfiles on my Versatile Express and verified
that network stability issues (LP #673820) are now fixed.
* Booked Linaro Connect Q4.11 travel.
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: overrunning OMAP3 upstreaming work (mostly) replanned
Current Milestones:
|| || Planned || Estimate || Actual ||
||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || ||
Historical Milestones:
||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 ||
||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a ||
||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 ||
||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 ||
||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 ||
||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 ||
||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 ||
== upstream-omap3-patches ==
* more reshuffling of patches and dropping of unnecessary changes (eg
code reformatting)
* we're going to divide this blueprint into four, each of which has a
reasonably clearly defined submilestone and an estimated 3
engineering weeks of work in it
* in order to not have work on this completely push out other items on
the schedule, we're going to limit work done on this to 2 or 3 days
each week
* still todo: actually split the blueprint, set dates for
submilestones, check that other blueprints fit reasonably in the
other half-week
== linaro-qemu-11.11 ==
* built a pre-release tarball and tested it -- looks good for next
week's release
* investigated whether we can reinstate the firmware blobs in our
releases (bringing us back into line with upstream) -- should be
possible but need to go through the license approval process since
some are GPLv3
== a15-system-mode-planning ==
* starting to see some (gentle) pressure for A15 support
* thinking about what we should do here; my current opinion is that
QEMU should implement an "A15 without virtualization or LPAE" -- we
have Linux kernels that will boot on this, and it is essentially
what an A15-on-A15 hw virt guest would see. The device work will be
needed for KVM anyway. Need to write this up.
== other ==
* submitted TSC licensing request to add the firmware blobs back into
our qemu-linaro tarballs, in line with how upstream do releases
* I need to track better how much time I'm spending on things like code
review on qemu-devel, minor bug fixing and other things that aren't
blueprints
* all holiday to the end of the year now booked (see below)
Current qemu patch status is tracked here:
https://wiki.linaro.org/PeterMaydell/QemuPatchStatus
Absences (to end of year):
Sep 19, Sep 29-Oct 07, Oct 17, Nov 21, Dec 15-Jan 03: leave
Oct 30-Nov 04: Linaro Connect Q4.11
Hi,
* I've been setting up a new system because the old laptop died
* finished the initial port of libunwind for Android on ARM
* changed debuggerd to make use of libunwind to unwind the stack of
crashing applications
* it works and the output looks great :)
* I plan to document these things in the wiki by next week
Regards
Ken
Just as an FYI, I've added these loops to the libav microbenchmarks
avg-h264-chroma-mc8-8.txt
avg-pixels8-8.txt
ff-h264-idct-add-8-8.txt
ff-put-pixels8x16-8.txt
h264-loop-filter-luma-8.txt
idct-internal-8.txt
put-h264-chroma-mc8-8.txt
put-h264-qpel8-h-lowpass-8.txt
put-h264-qpel8-hv-lowpass-8.txt
put-h264-qpel8-v-lowpass-8.txt
based on Michael's h264 profile. These loops:
decode_residual
ff_h264_decode_mb_cavlc
fill_decode_caches
aren't really the kind of thing that the microbenchmark is designed for;
running the whole h264 benchmark is probably a better test. Some of the
functions in the profile just consist of two copies of a simpler loop,
one after the other, so for those I just used the simpler loop.
Usual microbenchmark caveats apply.
Richard
