== Activity ==
TCWG-919 Thunks to undefined symbols
Now committed upstream
TCWG-614 Long branch thunks
Sent RFC to llvm-dev
Have a good idea about how to proceed.
First step is to rewrite existing implementation using synthetic sections.
Currently thinking about the best way to do this.
Wrote first draft of Fosdem 2017 presentation
Booked travel for Fosdem
Registered for Linaro Connect
== Plans for next week ==
Linaro TCWG-614 Long branch thunks
Aim to get a patch out for review for thunks as synthetic sections
== Progress ==
* Out of office [2/10]
* [ARM GlobalISel] Use CC support for lowering args/return [TCWG-946] [1/10]
- Brushed up and committed upstream
* [ARM] Use AddDefaultPred everywhere [TCWG-987] [3/10]
- Patches in upstream review
* Misc [4/10]
- Mailing lists, meetings, 2017 objectives
- Code reviews
- FOSDEM slides
- Investigated buildbot failures and reverted some patches (and ran
a precommit on the next version)
== Plan ==
* Vacation until January 9th, 2017
~ Progress ~
* Fix foreign frame problem in C++ exception unwinding. PR 20939. [2/10]
Being discussed. We agreed on the approach fixing the bug. Need a
patch.
Find other issues during the investigation, and fixed them. PR 20953,
PR 20954, and PR 20955 are fixed.
* GDB exception handling is broken on i686-w64-mingw32. PR 20977. [3/10]
In short, we can't use longjmp in SJLJ exception handling. Need post
an RFC.
* Upstream patches review. [5/10]
** SVE GDB patches review.
Carefully read the patches line by line for the first time. Find some
issues on target descriptions, and post my comments upstreams. Hack
GDBserver to get SVE on normal juno board. Need more time to think
about how to move on.
** Review sparc target descriptions.
** 7.12.1 release discussion.
~ Plan ~
* PR 20939, PR 20977.
* On Holiday from Wed.
--
Yao Qi
== Progress ==
o Linaro GCC/Validation (7/10)
* Completed backports
* Merged FSF branches (5 and 6)
* Released 2016.12 source snapshots (5 and 6)
* Closed bugzillas #1925, #2575 and #1963
o Misc (3/10)
* Various meetings and discussions.
== Plan ==
o Finish on-going tasks before holiday (Tuesday evening).
Progress:
TCWG-985 PIE on ARM broken
- Now fixed
TCWG-911 Eglibc requires a .ARM.attributes section for dlopen
- Worked around this with a simple hack to retain the first build
attribute section seen. This should suffice for the majority of
use-cases on a host platform using the default compiler. More work is
needed later. Now upstreamed.
TCWG-919 Thunks to undefined symbols
- In upstream review, as expected got some push back, I had hoped to
have resolved this on Thursday and committed today, but no response
last night.
PR31332 X86 pic plt sequences broken
- Worked out a fix, but haven't sent upstream due to needing to spend
quite a bit of time writing tests.
Other:
About 3/4 way of writing up AArch64 Ifunc for possible inclusion in
some public facing documentation.
Got a new blank machine from IT with permission to install linux
myself. Have now built myself a 16.04 machine and got my environment
set up.
Planned absences:
- on holiday for two weeks, back on Tuesday 3rd December
Next year:
- Top priority is long range thunks in lld, followed by an ARM lld build bot.
== Progress ==
* [ARM GlobalISel] Add support for integers < 32 bits wide [TCWG-980] [4/10]
- A number of patches in upstream review
* [ARM] Refactor AddrMode3 [TCWG-989] [1/10]
- Did some preliminary investigations / tinkering for removing a
hack in the representation of LDRH
* Rewrite llvm-projs in Python [TCWG-833] [2/10]
- More refactoring etc
- It is finally done, yay
* Misc [3/10]
- Address review comments on outstanding patches (committed
TCWG-925, still waiting for TCWG-946)
- AArch64 3.9.1 release [TCWG-886]
- Meetings, mailing lists, code reviews
== Plan ==
* [ARM] Refactor AddrMode3 [TCWG-989]
* FOSDEM slides
* Vacation between December 24th and January 9th.
The Linaro Toolchain Working Group (TCWG) is pleased to announce the
2016.12 snapshot of both Linaro GCC 5 and Linaro GCC 6 source
packages.
Linaro GCC 6 monthly snapshot[1] is based on FSF GCC 6.2+svn243594 and
includes performance improvements and bug fixes backported from
mainline GCC. This snapshot contents will be part of the 2017.02
stable[2] quarterly release.
This snapshot tarball is available on:
http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.12/
Interesting changes in this GCC source package snapshot include:
* Updates to GCC 6.2+svn243594
* Linaro BZ #2575: backport from trunk r239561, r242555.
* Backport of [Bugfix] [AArch32] PR target/78041
* Backport of [Bugfix] Fix test names for trad.exp tests PR testsuite/78136
* Backport of [Bugfix] PR middle-end/78201
* Backport of [Bugfix] PR tree-optimization/71636
* Backport of [AArch32] Implementing vmaxnmQ_ST and vminnmQ_ST intrinsincs
* Backport of [AArch64] aarch64-*-freebsd* support for gcc
* Backport of [AArch64] Add a SHA1H pattern
* Backport of [AArch64] Align FP callee-saves
* Backport of [AArch64] Improve stack adjustment
* Backport of [AArch64] Improve stack adjustment: add testcase
* Backport of [Cleanup] Fix typo in name
* Backport of [Cleanup] Remove all uses of
TARGET_FLT_EVAL_METHOD_NON_DEFAULT and poison it
* Backport of [Cleanup] Remove redundant TARGET_VFP
* Backport of [Misc] Optimize strchr to strlen (1/2)
* Backport of [Misc] Optimize strchr to strlen (2/2)
* Backport of [Testsuite] [AArch32] Fix failing vminnm/vmaxnm test on ARM
* Backport of [Testsuite] [AArch32] FP16 ARM Alternative format
variants of AAPCS tests
* Backport of [Testsuite] Fix traditional cpp test failure
* Backport of [Testsuite] Report DejaGnu ERROR messages in compare_tests
* Backport of [Testsuite] Report DejaGnu ERROR messages in dg-extract-results
* Backport of [Cleanup] [AArch32] Remove redundant model field from
FPU descriptions
* Backport of [Cleanup] [AArch32] Use VAR_P
* Backport of [Cleanup] [AArch64] aarch64-c.o should depend on TARGET_H
* Backport of [Cleanup] [AArch64] Add a comment before each set of cores
* Backport of [Cleanup] [AArch64] Add function comments to some
prologue/epilogue helpers
* Backport of [Cleanup] [AArch64] Cleanup add expander
Linaro GCC 5 monthly snapshot[1] is based on FSF GCC 5.4+svn243604 and
includes performance improvements and bug fixes backported from
mainline GCC. This snapshot contents will be part of the next
maintenance release.
This snapshot tarball is available on:
http://snapshots.linaro.org/components/toolchain/gcc-linaro/5.4-2016.12/
Interesting changes in this GCC source package snapshot include:
* Updates to GCC 5.4+svn243604
* Linaro BZ #2575: backport from trunk r232812.
Subscribe to the important Linaro mailing lists and join our IRC
channels to stay on top of Linaro development.
** Linaro Toolchain Development "mailing list":
http://lists.linaro.org/mailman/listinfo/linaro-toolchain
** Linaro Toolchain IRC channel on irc.freenode.net at @#linaro-tcwg@
* Bug reports should be filed in bugzilla against GCC product:
http://bugs.linaro.org/enter_bug.cgi?product=GCC
* Interested in commercial support? inquire at "Linaro support":
mailto:support@linaro.org
Progress:
TCWG-829 Ifunc support
- Refactored implementation using synthetic sections upstreamed. Found
out that x86 ifunc was broken and probably hadn't ever worked so I
fixed that while I was there.
PR31332 x86 pic plt sequences broken
- Found out that x86 pic and pie is broken in lld, the implementation
assumes that .got is immediately followed by .got.plt with no gap. As
lld makes no such guarantees it is easy to break with a trivial
example. Raised PR31332 after investigating the root cause. Spent
quite a bit of time on this, even though it is x86 specific, I wanted
to make sure I hadn't broken it.
Fosdem-2017
- Submitted a llvm-devroom talk on lld to Fosdem (post deadline, but
probably still up for consideration)
Plans for this week:
TCWG-985 PIE on ARM broken
- I have a simple fix that should be simple to upstream
TCWG-919 Thunks to undefined symbols
- I have a downstream patch, but there is risk I'll be asked to refactor
TCWG-911 Eglibc requires a .ARM.attributes section for dlopen
- There is a trivial hack to make this work; just use the first ARM
attributes section and throw away the rest. A proper solution to
support ARM attributes merging will take some time.
PR31332 x86 pic plt sequences broken
- I think I can fix this fairly cheaply which while not directly
relevant to ARM, it does give me another easily accessible target to
test on my desk top and has some community benefits.
Ifuncs
- LLD doesn't support taking the address of ifuncs for any
architecture. I don't think that this is common practice, but it is a
latent problem that it might be good to fix now when ifunc is in my
head.
Planned holidays:
19th December till end of the year, back on Tuesday 3rd January
