== Atomics ==
* Testing the libgcc fallback code with Nicholas's kernel patch -
and then fixing my initialisation code to use init_array's (thanks
Richard for the hint)
* Tidying stuff up after a review of my patch by Richard - the
sync.md is now smaller than the original before I started.
* Discussing sync semantics with Michael Edwards - he's spotted that
the gcc ARM sync routines need to move their final memory barrier
for the compare-exchange case where the compare fails.
* Looking at valgrind; it looks like it should be OK with the
commpage changes; but it doesn't currently support ldrexd and strexd;
there is a
patch for it to do ARM mode but not thumb yet.
Dave
== This week ==
* Catching up on email.
* More experiementation with the auto inc/dec stuff. TBH, this has taken
longer than expected, but I think it's close now.
* Wrote a dejagnu testcase for PR 49196. Tested it on trunk and submitted
it upstream.
== Next week ==
* Backport fix for PR 49196.
* Look at NEON reload failure.
* More auto inc/dec.
Richard
RAG:
Red:
Amber:
Green:
Current Milestones:
|| || Planned || Estimate || Actual ||
||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || ||
Historical Milestones:
||finish qemu-cont-integn || 2011-01-25 || 2011-01-25 || handed off ||
||first qemu-linaro release || 2011-02-08 || 2011-02-08 || 2011-02-08 ||
||qemu-linaro 2011-03 || 2011-03-08 || 2011-03-08 || 2011-03-08 ||
||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 ||
== other ==
* wrote a number of patches fixing issues identified by exhaustive
testing of the ARM decoder. Still some parts of the Thumb decoder
to deal with.
* discussion about 1176 (somebody has some patches to add support for
it) and what set of feature switches are needed to support this and
the 1136r1 (they have most but not all of the v6K feature set)
* sent some patches which deal with the "VLDM/VSTM generate too many
TCG ops" bug by raising the limit on number of TCG ops
* sent a pull request for some ARM patches that had been languishing
on the mailing list
* tracked down a regression making vexpress crash when run on upstream
QEMU to a recent Xen-related patch
* working on AFDS (annual review) paperwork
Meetings: toolchain, standup
Lots of interrupts/bugfixing/review recently means I'm drifting slightly
behind schedule on blueprints. Need to refocus on those next week.
Current qemu patch status is tracked here:
https://wiki.linaro.org/PeterMaydell/QemuPatchStatus
Absences:
1-5 August: Linaro sprint 1111
(maybe) 15-16 August: QEMU/KVM strand at LinuxCon NA, Vancouver
[LinuxCon proper follows on 17-19th]
== GDB ==
* Completed setup and baseline run for remote gdb testsuite.
This involved tracking down and working around a variety
of problems including:
- issues with the cross-compiler packages
- board files and sysroot for the debugger to use
- timing problems in the dejagnu harness
- multiple problems in the GDB testsuite itself
At this point, I'm down to about a dozen extra FAILs and
about 2000 tests (out of 16000) tests that are not executed
in the remote testsuite for one reason or the other. Next
step will be to analyze those and create bug reports.
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,
- investigating detection of general over-widening cases in the vectorizer
- improvements of widen-mult - proposed for merge to gcc-linaro-4.6
- fixed PRs 49443 and 49478
Ira
Hi,
* in order to have the android's debuggerd use libunwind I looked at
libunwind's remote interface and especially the libunwind-ptrace lib
that sits on top of that.
* the remote interface seems a bit awkward to me. The user provides
a set of callbacks to access the inferior memory or registers. Instead
of using these callbacks to obtain the actual unwind information
(eh_frame fro example) it requires the user implement another callback
(find_proc_info) to lookup the unwind info himself.
* the libunwind-ptrace currently deos not support the ARM specific
unwind tables
* started to look into how to improve the situation
* not straight forward as it's tightly bound to eh_frame unw info
and libunwinds DWARF parsing mechanism
* attending a class this afternoon
* Note: I'm on vacation starting in a few hours and I'll be back on
Tuesday next week.
Regards
Ken
== Progress ==
* Backported A5 / A15 tuning to Linaro GCC. Waiting for test results.
* T2 perf. meeting.
* Backported the neon length patch back.
* Patch for PR49385 being tested.
* Bootstraps broken yet again / upstream maintenance / test regressions.
* Waiting on Branch_cost results .
* Minor binutils patches as a result of upstream maintenance.
== Plans ==
* Finish BRANCH_COST tuning
* Look at VFP moves for some more .
* Backport some of the upstream bug fixes that need to be done.
Meetings:
* 1-1s
* TCWG call.
* At Google unconference 17-19 June
Chaired the Toolchain Working group call. Michael H was unavailable (but
OK) following yet another earthquake in Christchurch.
Continued working on my widening multiplies patches. I did think for a
while there must be a logic flaw because it's using the wrong sized
inputs to instructions, but on closer inspection that was taken care of
in the RTL transformations. The changes I already had seem good in all
the test cases I could generate. I've also identified a number of
additional optimization opportunities, so I've been tweaking the patch
for those.
Continued trying to figure out why my Thumb2 constants patches break the
native bootstrap build. The stage2 compiler enters an infinite loop, but
I couldn't easily identify why, as yet.
Backported Julian's unaligned access patches to a Linaro test branch.
----
Upstream patched requiring review:
* NEON scheduling patch
http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html
== This week ==
* Experimented more with A8 and A9 tuning for auto inc/dec addresses.
* More work on the auto inc/dec pass itself.
* Compared the assembly output in the GCC testsuite for a range
of targets (avr, bfin, h8300, ia64, m32c, m32r, m68k, am33,
pa, pdp11, powerpc, rx, score, sh, xstormy16 and vax).
* Looked at a few bug reports. Will submit patches when I get back.
== Next week ==
* Holiday!
Richard
== 64 bit Atomics ==
* Wrote more test cases; now have a nice 3 thread test that passes -
and more importantly, it fails if I replace one of the atomic ops
by a non-atomic equivalent.
* Modified existing atomic helper code in libgcc to do 64bit
* Added init function to 64bit atomic helper to detect presence of
new kernel and fail if an old one is present.
That last one is a bit of a pain; it now correctly exits on existing
kernels and aborts; qemu user space seg faults
because access to the kernel helper version address is uncaught. So
first thing I need to do is try the early kernel patch Nicolas
sent around, and then I really need to see if qemu can be firmly
persuaded to run it.
== String routines ==
* Ran denbench with sets of strlen; started running some spec as well.
== QEmu ==
* Tested Peter's prelease tarball in user space and a bunch of
system emulations
- successfully managed to say hello to #linaro from an emulated
overo board using USB keyboard.
== Other ==
* Booked 4th July week off.
Dave
