Hello,
Following today performance call
(https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2011-08-23)
here are some points raised regarding the steps towards enabling SMS by default:
* Benchmarks testing:
-- Running benchmarks as EEMBC and SPEC2006 with SMS enabled is
crucial to expose loops where SMS degrades the performance. those
loops need to be analysed to construct a cost model.
-- SMS increases code size by introducing prologue and epilogue to the
loop kernel. This should also be measured.
-- Measure increase in compile time: on native or cross build?
Currently SMS fails to bootstrap trunk on ARM machine. this should
also be taken into account when considering enabling it by default.
Should it be turned on with -O2 or -O3?
SMS flags to use for testing:
-O3 -fmodulo-sched-allow-regmoves -fmodulo-sched
-funsafe-loop-optimizations -fno-auto-inc-dec
Thanks,
Revital
Hi
Some time ago we agreed that not everyone here uses Ubuntu distribution
and decided to provide so called 'generic linux' cross toolchain.
Recently I managed to get it done and now need brave testers to tell is
it working or not.
Get it here: http://people.linaro.org/~hrw/generic-linux/ (64bit only)
Needed files are toolchain-11.07.tar.xz and init.sh script. Unpack
tarball from / so /opt/linaro/11.07/ will be populated and put init.sh
anywhere you want (it will be integrated into tarball later).
How to use:
$ source init.sh
this will add cross toolchain into PATH and also set LD_LIBRARY_PATH to
two directories:
- one with binutils libraries
- second with all extra libraries which may be needed
Feel free to experiment with second dir by removing files from there and
checking are system provided libs are fine too.
So far I checked this toolchain under few distributions:
- Ubuntu 10.04 'lucid' LTS
- Ubuntu 11.04 'natty'
- Fedora 14
- OpenSUSE 11.4
- CentOS 5.6
It failed only under CentOS (which was expected due to it's age).
How did I checked? So far compilation of 'gpm' and 'zlib' were tested.
==GCC==
===Progress===
* Continue to look at the test failure with mvectorize-with-neon-quad.
Should be able to commit the backend workaround in on Monday .
* Having some problems getting my panda board working reliably. I'm
not sure if its the temperature or what but when it gets hot in the
office as it was on Tuesday keeping it working reliably is hard. The
board locks up and then crashes quite often.
* Looked at VFP moves again for some more time.
* Committed tbh range change.
* Committed fixes for PR50022
=== Plans ===
* Finish off VFP moves patch.
* Look at BRANCH_COST results.
* Breakdown the T2 performance blueprints into smaller blueprints.
* Backport tbh range changes to Linaro 4.6
* Test the intrinsics patch once with some more intrinsics tests and
then merge it in to Linaro gcc 4.6
Meetings:
* 1-1s
* TCWG calls
Absences.
* 29th Aug - Sept. 2 - Holiday booked and approved.
* 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - hotel
to be booked.
Hi all,
I'm having real trouble here :(
I just can't seem to get bzr to work! I've tried to branch
gcc-linaro/4.6 again and again, and it just won't. My other machine
refuses to do the merge from lp:gcc/4.6, presumable because the bzr on
there is too old.
I'm stuck. Can anybody else do the merge from upstream?
I'm going to keep trying.
Andrew
* GCC
Completed merging GCC 4.5 from FSF to Linaro.
Spun release tarballs for Linaro GCC 4.5 and 4.6. Uploaded them to
Michael's server, and kicked off the test builds remotely.
Submitted expenses for Linaro Connect.
Finally (!) committed my widening multiplies patches to FSF. :)
Continued trying to figure out what's wrong with my thumb2 constants
patches. I think I have identified a possible flaw, but I'm having
trouble reproducing the problem as I have been unable to pin down a
specific constant/expression combination that makes it through all the
other optimizations intact, and triggers the problem. I've not run out
of idea yet though ...
* Other
On leave all day Wednesday.
Prepared for the big CodeSourcery to Mentor switch-over by moving all my
work-in-progress data over to the new servers.
== 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
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Wittkopp
Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht
Stuttgart, HRB 243294
