Port to microinstance - TCWG-432 [5/10]
* Non-lab side of minimal trust benchmarking
* More investigation of runtime anomalies
* Reordered builder phases to do useful work while waiting for targets
* Updated everything to work with benchmarking LAVA user (rather than
running as me)
Automated backport benchmarking - TCWG-352 [2/10]
* Cycles of review/development/testing
Controlled image builds - TCWG-360 [1/10]
* More failures to get image to boot on Juno
Log critical data - TCWG-349 [1/10]
* Everything now logged, except where it depends on TCWG-360
Misc - [1/10]
=Plan=
Finish non-lab side of minimal trust benchmarking
Commit backport benchmarking, review permitting
Tweak microinstance in reaction to lab work
More Juno image work
More runtime anomaly work
=Availability=
Off from this Friday, back for three days from Monday 4th April
Return to ARM on Thursday 7th April
== This week ==
* Bugzilla 69663 - [ARM] Implement overflow arithmetic standard names (5/10)
- Resolved 50% of thumb2 failures
- Resolved issues with overlapping registers and not setting
condition codes
- Wrote compile only test cases that pass validation
* TCWG-247 - Create Validation Job to run on GCC Trunk Commits (2/10)
- Investigation into Python API for discovering when Jenkins builders
are idle
* Linaro connect recovery day (2/10)
* Misc meeting (1/10)
== Next week ==
* Bugzilla 69663 - [ARM] Implement overflow arithmetic standard names
- Resolve remaining thumb2 issues
* TCWG-247
- Create prototype implementation
= Progress ==
* Day off (2/10)
- After Connect, recuperating, jet lagging
* EuroLLVM (6/10)
- Flying Wed to Barcelona, attending conference
- Back on Saturday
* Background (2/10)
- Code review, meetings, discussions, general support, etc.
- Planning for a bigger team (git, Jenkins, infrastructure)
* Sick on Monday [2/10]
# Progress #
* AArch64/ARM linux syscall for process record. [2/10] TCWG-532
ARM patch (fixing the register for syscall arg pass) is committed.
Canonicalize ARM syscall patch is posted for review.
* Support range stepping on arm-linux. [4/10] TCWG-545
Preparatory patches fixing bugs when "single step the instruction
branch to itself" are being reviewed. Pedro thinks my patches may
not work in some rare cases, and I spend some time writing the case
and prove it won't happen.
* Misc [2/10]
** file expense,
** upstream patch review,
# Plan #
* TCWG-532
* TCWG-545
--
Yao
The Linaro Toolchain Working Group (TCWG) is pleased to announce the
2016.03 snapshot of the Linaro GCC 5 source package.
This monthly snapshot[1] is based on FSF GCC 5.3+svn234210 and
includes performance improvements and bug fixes backported from
mainline GCC. This snapshot contents will be part of the 2016.05
stable [1] quarterly release.
This snapshot tarball is available on:
http://snapshots.linaro.org/components/toolchain/gcc-linaro/5.3-2016.03/
Interesting changes in this GCC source package snapshot include:
* Updates to GCC 5.3+svn234210
* Backport of [Bugfix] [AArch64] [Linaro #1994] Disable
pcrelative_literal_loads with fix-cortex-a53-843419
* Backport of [Bugfix] [AArch64] [Linaro #2123] Fix dependency of gcc-plugin.h
* Backport of [Bugfix] [AArch32] PR target/62554 target/69610 Fix for ARMv3
* Backport of [Bugfix] [AArch32] PR target/69161: Don't ignore mode
when matching comparison operator in cstore-like patterns
* Backport of [AArch32] Enable instruction fusion of AES instructions
on ARM for Cortex-A53 and Cortex-A57
* Backport of [AArch64] Add missing return in aarch64_internal_mov_immediate
* Backport of [AArch64] Enable instruction fusion of dependent AESE;
AESMC and AESD; AESIMC pairs
* Backport of [AArch64] Fix installed plugin headers for aarch64, m68k and c6x
* Backport of [AArch64] GCC 6 regression in vector performance. - Fix
vector initialization to happen with lane load instructions
* Backport of [AArch64] Restrict 16-bit sqrdml{sa}h instructions to FP_LO_REGS
* Backport of [Testsuite] [AArch64] add check for aarch64 in
check_effective_target_section_anchors
* Backport of [Testsuite] Print markers to stderr to avoid races with
sanitizer output
* Backport of [Misc] Fix ChangeLog for 233518
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
[1]. Stable source package releases are defined as releases where the
full Linaro Toolchain validation plan is executed.
[2]. Source package snapshots are defined when the compiler is only
put through unit-testing and full validation is not performed.
== Progress ==
o BKK16 remote (5/10)
* Followed TCWG sessions
* Extended validation:
- worked with Kugan
- implemented job for native validation
o GCC dev. (4/10)
* Remote validation sanitizing:
- iterate on the output pattern fix
- testing a fix for stderr/stdin ordering issue
* Gave some support on __sync builtins, preparing a fix for armv8.1
o Misc (1/10)
* Various meetings
== Plan ==
o GCC 5 branch merge, and 2016.03 snapshot
o Continue on-going tasks
Port to microinstance - TCWG-432 [17/10]
* Investigating difference between LAVA and 'desktop Juno' runtimes
** Some of this was down to piles of /dev/console output - redirecting
to file improved SPEC build time by 75%!
** Some cases make sense, others remain unexplained
** Might just go away if we update the Juno image
* Wrote up how to do benchmarking for minimal-trust cases
** Needs both lab and development work
* Merged another large tranche of changes back to benchmarking branch
** Microinstance more or less functional, main instance benchmarking
seems unbroken
** But some more tweaks to make as Lab work happens
* Prepared backport benchmarking for merge
Misc [3/10]
=Plan=
* Submit backport benchmarking for review
* Tweak uinstance in reaction to lab work
* Implement the non-lab side of minimal-trust benchmarking
* Return to looking at Juno image generation
* Look some more at LAVA/desktop runtime differences
* Implement small improvements, if time
== This week ==
* Bugzilla 69663 - [ARM] Implement overflow arithmetic standard names (3/10)
- Resolved thumb2 failures
- Negdi2 was not generating instruction to set condition codes
* Bugzilla 70008 - [ARM] Reverse subtract with carry can be generated in
thumb2 mode (1/10)
- Created new patch using new predicate that matches arm and thumb2
constraints
- Received approval to GCC 7 stage 1
* Bugzilla 70014 - [ARM] Predicate does not match constraint
(*subsi3_carryin_const) (1/10)
- Fix checked into trunk
* Linaro Connect meetings (5/10)
== Next week ==
* Bugzilla 69663 - [ARM] Implement overflow arithmetic standard names
- Create compile only test cases and re-run validation testing
- Post new patch upstream
Hey,
Regarding the GCC ABI 5 issue, I was wondering what's the policy
behind updating packages on stable updates for both Debian and Ubuntu.
Our time frame is a bit constrained, and we definitely will have to
take some hard decisions in the next six months, so I'd like to
understand everything that is at stake before I have my own opinion.
LLVM has a 6 month major cycle, releasing around February / August.
Major releases are allowed to break the ABI. Major breakages need one
release warning period.
Ubuntu has a 6 month release cycle, around April / October. IIUC,
major releases are allowed to have new versions of packages, but
updates for the next few years have to keep within the same major
release.
Debian has a -1 years release cycle (heh), and has the same major /
minor policy, which makes it a lot harder to update major versions.
However, I believe unstable is still not closed, nor will be in August
this year, so updating to LLVM 3.9 will not be a problem, but it will
mean users will have to wait a bit more to get a working LLVM.
The time frame is then:
3.8.0 released March (without the fix)
Ubuntu X released April
3.9.0 releases August (hopefully with a fix)
Ubuntu X+1 released October
Debian freezes ??
LLVM 3.8.1 ??
If we don't back-port GCC ABI 5 into 3.8.1, Ubuntu users will not have
the fix ever, unless you *can* update to 3.9.0 in August.
Ubuntu X+1 will be fine using 3.9, as will Debian after August, unless
you guys freeze before that.
I believe both Debian and Ubuntu have a trunk-based LLVM package for
experimental use only, and it would be bad, but not completely broken,
to recommend users to use that meanwhile.
If Debian freezes *before* 3.9.0 is out, or if Ubuntu can't update to
3.9.0 on April's release, then we'll have a strong reason to back-port
the change to 3.8.x. If not, even though it will be uncomfortable for
users until August, the argument is not that strong and will be hard
to get it through.
Any comments? Ideas? Does any of that make sense?
cheers,
--renato
