Hi,
ld in the current (4.6-2011.07-0-8-2011-07-25_12-42-06) Android
toolchain fails to link uboot:
arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/libgeneric.o:
Unknown mandatory EABI object attribute 44
arm-eabi-ld: failed to merge target specific data of file
/mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/crc16.o
arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/libgeneric.o:
Unknown mandatory EABI object attribute 44
arm-eabi-ld: failed to merge target specific data of file
/mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/crc32.o
arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ctype.o:
Unknown mandatory EABI object attribute 44
arm-eabi-ld: failed to merge target specific data of file
/mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ctype.o
arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/div64.o:
Unknown mandatory EABI object attribute 44
arm-eabi-ld: failed to merge target specific data of file
/mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/div64.o
arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/errno.o:
Unknown mandatory EABI object attribute 44
arm-eabi-ld: failed to merge target specific data of file
/mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/errno.o
arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ldiv.o:
Unknown mandatory EABI object attribute 44
arm-eabi-ld: failed to merge target specific data of file
/mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ldiv.o
I believe this is already fixed in upstream binutils (or at least in
hjl's 2.21.52.0.2 release from kernel.org /pub/linux/devel/binutils).
ttyl
bero
== Last week (Linaro Connect) ==
* Reran libav comparisons after Ira's fix for excessive promotion.
The vectorized versions are now at least as good as the non-vectorised
ones. Updated wiki page with new asm output and microbenchmark results.
* More work on SMS. I have some patches that wire up the ddg code
to IV analysis. It gave some nice benchmark improvements, but also
some regressions. Traced the regressions down to cases where the
schedule for small iis generated too many moves. E.g. in a small
microbenchmark, we were able to schedule 6 instructions with an
ii of 3 (i.e. in a loop iteration of 3 cycles), but then needed
to add ~9 moves in order to keep the dependencies correct.
We got much better code with a larger ii and fewer moves.
Wrote a patch to estimate how many moves would be added, and to try to
a larger ii if the number of moves is too high. This improved the
results for one benchmark independently of the iv patch, and had no
effect on the others.
Discussed this with Revital, who said that Mustafa had tried a similar
thing but seen no benefit.
* Got powerpc-ibm-aix5.3 bootstraps working. Needs a few local fixes
due to C++ bootstrapping. Used it to test a couple of preparatory
patches for the IV work. Submitted those patches upstream.
* Ran benchmarks with -fno-schedule-insns after seeing that the first
scheduling pass was responsible for the main NEON-vs.-non-NEON
regression in EEMBC. It fixed that case, but as expected,
made others worse. Mentioned this to Ramana, who pointed me at
-fsched-pressure.
Reran the benchmarks with -fsched-pressure instead of
-fno-schedule-insns. It too fixed the main regression,
and improved a couple of other tests too. It showed a regression
in another test though. Looked at that regression. It was a case
where many registers were live across a loop, but not used in it.
This was causing the loop to have a very conservative schedule.
It would be better to spill some of the other registers instead.
Wrote a patch to take loops into account, and it seemed to do
the right thing for EEMBC. Sent it to Andreas, after Ulrich
mentioned that he had been looking at -fsched-pressure problems
on s390. Andreas is away for a while, though, so I might put this
on the back burner until he gets back.
== This week ==
* SMS
* auto inc/dec
* libav, perhaps
Richard
Hi,
* committed upstream a patch that reduces over-promotion of vector operations
* started to work on a new version of the patch to change the default
vector size for Neon
* attended Linaro connect
Ira
* Committed a set of SMS patches to trunk and gcc-linaro branch.
* Implemented a hack to evaluate the potential of SMS on SPEC2006/libqauntum.
* involved in non linaro issue
== QEMU ==
* After discussion with Peter started writing QEMU fixup for 64bit
atomic helper version location.
* Sent fixes for soc-dma code to qemu list
* Trying to understand just how much of omap_dma's code is needed.
== Other ==
* Travelling to/from connect
* Wanted to dial into some of the seessions in Corpus and Magdelen
rooms but the remote audio from them was unusable.
Dave
Hi,
Libunwind:
* finished initial ARM support for remote unwinding (libunwind-ptrace)
Android:
* took a closer look at the debuggerd
* got the perflab benchmark running on my PandaBoard using Linaro GCC
Misc:
* remotely attended some Linaro Connect Android sessions
Regards
Ken
== GDB ==
* Created Linaro GDB 7.3 branch
* Ported all remaining feature patches from Linaro GDB 7.2
* Backported mainline patches to fix remote test issues:
- Fixed #804387 Shared library test problems
- Fixed #804392 Rebuilt executables not copied
- Fixed #804396 Spurious failures
* Committed mainline patch to fix dlopen test cases
for remote testing (#804387).
* Committed mainline patches to fix misc. other remote
test problems (#804396).
== Misc ==
* Attended Linaro Connect in Cambourne.
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
I've updated:
https://wiki.linaro.org/RichardSandiford/Sandbox/NeonLibAv
so that it gives the output for current trunk, including Ira's commit
yesterday to reduce the amount of overpromotion. I also reran the
microbenchmarks. The good news is that the vectorised code is now
better in all cases than the non-vectorised code.
The biggest winner from last time was rgb24tobgr16_C(). It used to be
much worse with vectorisation due to lots of excessive widening.
Thanks to Ira's patch, the loop now looks pretty respectable,
and is ~3.25x faster than the non-vectorised code.
As well as using a more recent compiler, the new version also uses
-mvectorize-with-neon-quad. Once again it shows a significant improvement
over the default.
Richard
Continued work on widening multiplied. I've identified another cause for
the bootstrap failure, and submitted the new version for testing.
Continued trying to find out how my thumb2 constants patches are broken.
This is taking ages due to the time it takes to turn around a bootstrap
build on my IGEP board.
Tried to get the CS Panda boards to work again. They'll do the bootstrap
builds much faster (if still not quickly), but are no longer very well.
All my attempts to bring them back up remotely have failed. I've
discovered that the device the serial console on one was connected to
has been relocated to the new Mentor Graphics board lab, so this might
explain some of it ....
Chaired the Monday and Thursday meetings in Michael's absence.
Travelled to the Linaro Connect event in Cambourne, near Cambridge.
Other:
More machine trouble. I keep thinking I have the display issues solved,
and then it starts up with all the windows displayed double sized, but
requiring mouse clicks in the correct location .... typically this
happened just when I needed access to the pin number for the Monday
meeting. This hasn't happened since Monday, so hopefully it's now ironed
out ... this sort of thing does not happen with Windows. :(
----
Upstream patched requiring review:
* NEON scheduling patch
http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html
* Looking into SMS patches sent to mainline which expands SMS
functionally to avoid using doloop. The patches resolve the recent
bootstrap failure on mainline.
http://gcc.gnu.org/ml/gcc-patches/2011-07/msg01807.html
* Continue looking into 462.libquantum.
Valgrind wants a less stripped ld-2.12.1.so or it won't work. The build
process (that Michael Hope put together) just downloads the
libc6_2.12.1-0ubuntu6_armel.deb, and the ld-2.12.1.so in there is fully
stripped. I thought I'd be able to just get the
libc6-dbg_2.12.1-0ubuntu6_armel.deb instead, thinking that was just the
pre-stripped version of these libs -- but apparently it's not, because
trying to use those libs instead of the stripped ones results in undefined
symbols. For example, ld-2.12.1.so defines _rtld_global -- but
libc-2.12.1.so is looking for _rtld_global@@GLIBC_PRIVATE, so
_rtld_global@@GLIBC_PRIVATE
ends up undefined. (Ditto for __tls_get_addr, __libc_enable_secure,
_dl_argv, etc.)
I'm not sure who actually builds these packages (they're retrieved from:
http://ports.ubuntu.com/pool/main/e/eglibc/), but if anyone has any
suggestions on how to get past this, I'd be most appreciative. (I've got
angry developers trying to track down memory issues, who about to come after
me with torches and pitchforks :P )
Thanks,
Diane
== GDB ==
* Committed second mainline patch to fix re-built executable
remote test problems (#804392).
* Prepared for rebasing Linaro GDB on top of GDB 7.3 release.
== Misc ==
* Prepared for Linaro Connect.
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,
* Monday was full of IBM internal meetings
* Android
* got a self built LEB and generic version 2.3.4 of linaro android
running on my pandaboard (build with the gcc 4.6 07 release plus the
patch that Richard made)
* requires libicui18n.so (external/icu4c/i18n) to be built with -O2
* ran into a few issues (816491, 807230)
* libunwind:
* simplified the local unwinding (there is no need to touch the ARM
exidx table segment when looking it up)
* fixed a bug (corner case: the info of the IP to be unwound is
described by the last unw entry)
* made some progress on the remote unwinding via ptrace
* remotely searching the unw withing entry exidx table segment
* next step is to remotely extract the unw isns
Regards
Ken
RAG:
Red:
Amber: OMAP3 patch upstreaming is slower progress than hoped
Green: various outstanding patches accepted upstream in time for 0.15
Current Milestones:
|| || Planned || Estimate || Actual ||
||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || ||
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 ||
== upstream-omap3-patches ==
* omap-gpmc patches now all cleaned up; I think I need to look at
qdevifying this device before submitting patches, though
* sent patch for bug which makes n810 model crash when key is pressed
* sent a pull request collecting together the patches submitted so far
== other ==
* qemu 0.15: put together pull request for ARM patches I think should
go into this release; wrote ARM-related bits of the release notes
* helped GSoC student track down a bug causing android not to boot
* LP:816791: tracking down issues with running mono under qemu
(combination of a couple of known qemu bugs and a mono bug)
* admin/prep for upcoming travel (cambourne, vancouver, orlando)
* reviewing pl041 patches which add audio support to versatilepb
and vexpress models
* mailing list discussion of possible new qemu object model
* lots of meetings this week (toolchain, standup, doughnuts, team
comms x2)
Current qemu patch status is tracked here:
https://wiki.linaro.org/PeterMaydell/QemuPatchStatus
Absences:
1-5 August: Linaro sprint 1111
15-19 August: KVM Forum and LinuxCon NA, Vancouver
the current gcc-4.6/eglibc is now built multilib'd for -mfloat-abi=softfp|hard,
including the GCC runtime libraries. I hope that the gcc cross builds will pick
this up soonish, not needing to build the cross compiler twice for softfp and
hard float-abi.
Matthias
== 64 bit atomics ==
* Sent updated set of 64bit atomic patches to gcc list with fixes
from previous review
* Started hunting for other users of 64bit atomics than membase
jemalloc, sdl and boost lock free look like possibilities; but I've
not looked at them hard yet
== QEmu ==
* Released fix for last SD card block access error
- Vincent Palatin released a bunch of SD card fixes a few hours
later - that included a fix to the same bug; however it does look like
he has a bunch of other stuff we should keep sync'd with.
* Changing caching mode to writeback on the block layer fixes bug
732223 (hangs on heavy IO) - goes from 130KB/s to 8MB/s on vexpress
- Asked mailing list whether that's reasonable to make as default for SD
* Looking at path from CPU->MMC/SD card - the DMA on OMAP is pretty
inefficiently emulated, but the soc_dma code has an unused special
case for dma'ing to hardware, looks promising but need to figure
out how to use it and if it works.
* Comparing Vincent's SD card patch with earlier meego patches;
partial overlap.
== Other ==
* Pinged libc-ports for comments on my optimised memchr patch
* Image testing
Next week; I intend to be in Camborne on the afternoon of Monday,
Wednesday and Friday.
Dave
Hi,
I am checking the coverage of the NEON instructions mostly by writing
tests in C to check which instructions are generated (after
auto-vectorization) and which are not.
I put here https://wiki.linaro.org/IraRosen/Sandbox/InstructionCoverage
the list of things that I've checked till now.
Ira
Spun release tarballs for Linaro GCC 4.5 and 4.6. Sent them to Michael
Hope and Matthias Klose.
Testing for my widening multiplies patches revealed a bug when the
accumulate value had a different type. The problem is easily fixed, so
I've created a patch, submitted it, and now it's approved upstream.
Same again, this time with a bug involving constant integers. Again,
easily fixed, submitted, and approved.
Nobody had reviewed the first patch in my series - Richard Guenther had
reviewed all the others, but wasn't happy to review the expand pass. So,
I asked newly crowned RTL Maintainer Richard Sandiford to review it, but
apparently it's the wrong bit of the back-end, so I asked Bernd instead.
Bernd kindly reviewed and approved it, so now the whole series is ready
to commit if only my test comes back clean.
Continued trying to figure out why my thumb2 constants patch is broken.
So far, no further progress. It might be that Michael's build system is
confused, but it's looking likely to be a real bug.
----
Upstream patched requiring review:
* NEON scheduling patch
http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html
- Opened PR49789 to record the bootstrap failure with SMS flags.
- SPEC2006/libquantum: Wrote a hack to apply SMS on the hot loop. Need
to make it more accurate.
- Pinged SMS patches in mainline.
- Looking with Ramana on the effect of the Tree reassociation
improvement patch on bwaves
http://gcc.gnu.org/ml/gcc-patches/2011-07/msg00904.html
== 64 bit atomics ==
* Updated gcc patches as per comments from Ramana and Joseph; build
currently cooking on Panda
== Qemu ==
* Testing Peter's pre-release, finding bug on beagle (that he
tracked down to x-loader change)
* Found cause of occasional SD card errors I was seeing (SD: CMD12
in a wrong state); I'll cut
a patch next week, but the bug is writing the last sector throws
an error and also leaves it in
the wrong state
* Added a bunch of tracing code to the SD card layer
* With the tracing code and fixing the other bug I'm starting to
understand how it works - and
half a dozen reasons that the emulation is really slow; whether
that's the cause of the reported
recoverable lock ups under load is an interesting question; I
plan to fix the obvious problems
and see how it goes.
Dave
== GDB ==
* Committed mainline patch to fix re-built executable remote test
problems (#804392).
* Committed two more mainline patches to fix remote test issues.
== GCC ==
* Patch review.
* Determined root cause of bug #809768 (ICE in bionic libm).
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
== GCC ==
=== Progress ===
* ivopts patch to minimise the amount of VFP moves to integer
registers because of auto-inc - sent out for review. It appears to
test fine and reduces the number of FP to integer moves in certain
SPEC2k6 benchmarks by about 20%
* More cases with vfp moves identified and some more patches coming
out soonish. one-case where we have moves from VFP regs to integer
regs because we allow POST_MODIFY_DISP.
and another case from scimark where we have a case with moves from
integer registers to VFP registers because I suspect the order of
constraints in movdf_vfp has integer registers before fp registers
while
the movsf_vfp doesn't .
* Panda died a couple of times again because of power glitches in the
office - restarted runs for BRANCH_COST.
* Sorted out travel plans for UDS orlando. Need to book tickets.
* Sometime spent on getting the Eagle boards working.
* Bug triage and some patch review.
=== Plans ===
* Benchmark the ivopts patch to see what happens.
* Some issues with my last patch on movdi_vfp . I think I've missed a
set of ce_count and was thinking of why there was an Ada failure
with things outside IT blocks There appears to be an ubuntu bug for that.
* Disable POST_MODIFY for VFP mode values and see what happens and
change the order of the constraints to have loads to VFP registers
before loads to core registers for movdf_vfp and thumb2_movdf_vfp.
* Look at effects of auto-inc-dec with the VFP mode stuff.
* Look at EPILOGUE_USES and clear more of my patch queue.
Meetings:
* 1-1s
* TCWG calls
Absences.
* 1st Aug - 5th August - Linaro sprint.
* 8th - 9th August - Internal training.
* 29th Aug - Sept. 2 - Holiday booked and approved.
* 31st Oct - 4th Nov - Linaro Summit Orlando - Travel to be booked.