All,
During Connect the suggestion was made that each working group should have
its own IRC Channel for discussions and topics relating to the group in
particular (as opposed to #linaro which is 'generic' Linaro conversations).
Therefore I have just set up #linaro-tcwg on Freenode for the Toolchain
Working Group.
This channel is public and open to anyone who wants to talk with the TCWG
group about anything toolchain related.
Thanks,
Matt
--
Matthew Gretton-Dann
Toolchain Working Group, Linaro
Hello,
I just noticed that the manifest file of the Linaro gcc-5.5-2017.10 release under http://releases.linaro.org/components/toolchain/gcc-linaro/5.5-2017.10/x86_… from January, 13th 2018 differs from the original version from October 2017: the binutils, gdb and abe versions are different.
Could you please tell me the reason for the changes?
Thank you very much!
Andrej Gantvorg
* Short week - a public holiday
* Return jump function
- Writing up issues with test cases for upstream discussion based on
the ipa-cp implementation
* LLVM astar regression
- Trying to reproduce with trunk LLVM vs trunk gcc
- Clang build fails in tx1 (likely due to not enough memory ?)
- Set it up on dev-01. I see about ~2% difference. The difference
goes away when I use -fno-devirtualize-speculative. This suggests the
issue is still present. Perf results are also consistent with this.
- Reducing a self-contained test case
== Progress ==
o GNU releases
* Various support on process and infra.
o LLVM
* Benchmarking job on-going
* Buildbots baby-sitting
* Completed EuroLLVM feedback
* Created ticket: outliner support on ARM
After internal and upstream discussions.
o Misc
* Various meetings and discussions.
Progress:
[Upstream]
Patch set posted implementing some missing ARMv8.2-FP16 instructions.
I believe Alex has gone back to double check if there are any more.
[VIRT-243]
Initial patch posted for the ARMv8.1-Atomics extension.
Looking at the summary from Friday night's test run suggests there are
errors; I'll be looking at those next week.
r~
Activity:
[TCWG-1384] Add support for missing TLS local exec relocations tl LLD
Have an implementation ready to go upstream next week. In process
found that Gold and BFD disagreed on test output. Turns out that there
was a bug in BFD, reviewed Renlin Li's patch for it. Took rather more
of my time than I expected.
[TCWG-1375] Set 4 patches upstream to complete the removal of the
global subtarget
No response as yet.
Raised https://bugs.llvm.org/show_bug.cgi?id=37212 clang and gcc are
producing technically illegal ELF for debug information (references to
local symbols defined in comdat groups), both gold and bfd have
special case code to handle this case, lld does not. Leads to loss of
debug illusion for templated and inlined C++ functions.
Other
- Some research into how spec files and multilib works in gcc to see
how it could fit into clang's driver model.
- Joined the ELF ABI google group to fulfil a promise I'd made at Euro
LLVM to comment on a thread about debug information in comdat groups.
Holiday on Tuesday
Plans:
- Ping reviews.
- Push fix for TCWG-1384 upstream alongside some refactoring patches.
- Add some more tests to LLD to close some holes in the code-coverage
statistics.
- Continue looking at laundry list of small LLD changes.
- Get back to building Android.
=== Work done during this GCC week ===
* stack-protector failure on GCC ARM: need feedback from community
+ prevent CSE of stack protector's guard first by adding some extra
UNSPEC then instead by making all memory accesses involved volatile
+ write 2 monstro regex (251 & 377 characters respectively) to catch the
bug on ARM, Thumb-2 and Thumb-1
+ testing and will submit for review later today once I have all test
results
+ discuss raising a CVE
* Misc:
+ Arm meetings
+ Meeting with ST to discuss how to implement something akin to multilib
+ spec files for LLVM
+ Linary syncs
+ review of "Implement getConstraintRegister for ARM and AArch64" patch
by Mikhail Maltsev
=== Plan for weeks up to 25 ===
* Paternity leave
* Get stack-protector failure fix committed
* DSGHACK-25 (Support arithmetic on FileCheck regex variable): finish patch
* Start looking into LLVM SPEC optimizations Linaro tickets
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ 2.12 release kicked out the door; hopefully I can do a bit more
actual development work for a bit now...
+ investigating problems with execute-in-place-from-MMIO-device
functionality : the test case (for a Xilinx board model) crashes
reliably for me. I cooked up an RFC patch and sent it, but it
includes one weird hack and I'm not sure if it's the right approach...
+ we got a Coverity Scan run through after a couple of months of not
having one, and a pile of issues have accumulated. Waded through some
of them and flagged them up with the patch submitters who added the
code that introduced them.
Notes:
* QEMU will have not one but two interns working on Cortex-M0
and micro:bit support (one from Google Summer of Code and
one from Outreachy) !
* QEMU turns 15 years old this year. To celebrate we plan to
make the next release be 3.0 (and perhaps to have birthday
cake at KVM Forum?)
thanks
-- PMM
