* 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
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
