The Linaro Toolchain Working Group (TCWG) announces the 2014.06-1 release of
the Linaro GCC 4.9 source package. This is a respin of the 2014.06 release which
fixes some issues on AArch64 big-endian and in AArch64 libjava.
Changes in this GCC source package release include:
* Updates to GCC 4.9.1-pre+svn211964
* Revert backport of [AArch64] Define TARGET_FLAGS_REGNUM.
* Backport of [AArch64] Cost model improvements.
Please find the original 2014.06 release notes below:
The Linaro Toolchain Working Group (TCWG) is pleased to announce the 2014.06
stable release of the Linaro GCC 4.9 source package.
Linaro GCC 4.9 2014.06 is the third Linaro GCC source package release in the
4.9 series. It is based on FSF GCC 4.9.1-pre+svn211054 and includes performance
improvements and bug fixes.
With the imminent release of ARMv8 hardware and the recent release of the
GCC 4.9 compiler the Linaro TCWG will be focusing on stabilization and
performance of the compiler as the FSF GCC compiler approaches version 4.9.1.
The Linaro TCWG will provide monthly stable[1] source package releases until
FSF GCC 4.9.1 is released. At that point Linaro GCC 4.9 will merge in
FSF GCC 4.9.1 and, release Linaro GCC 4.9.1, and then return to a schedule of
stable quarterly releases and monthly engineering[2] releases.
Interesting changes in this GCC source package release include:
* Updates to GCC 4.9.1-pre+svn211054
* Backport of [AArch32] PR rtl-optimization/60663
* Backport of [AArch32] Suppress Redundant Flag Setting for Cortex-A15.
* Backport of [AArch32] Support ORN for DIMode.
* Backport of [AArch32] Optimise NotDI AND/OR ZeroExtendSI for ARMv7A.
* Backport of [AArch32] Allow any register for DImode values in Thumb2.
* Backport of [AArch32] Initialize new tune_params values.
* Backport of [AArch32] Initialise T16-related fields in Cortex-A8
tuning struct.
* Backport of [AArch32] Enable tail call optimization for long call.
* Backport of [AArch64] TRY_EMPTY_VM_SPACE Change for ILP32.
* Backport of [AArch64] Fix TLS for ILP32.
* Backport of [AArch64] vrnd<*>_f64 patch.
* Backport of [AArch64] Fix possible wrong code generation when
comparing DImode values.
* Backport of [AArch64] Add a space to memory asm code between base
register and offset.
* Backport of [AArch64] Fix aarch64_initial_elimination_offset calculation.
* Backport of [AArch64] vqneg and vqabs intrinsics implementation.
* Backport of [AArch64] Vreinterpret re-implemention.
* Backport of [AArch64] Define TARGET_FLAGS_REGNUM.
* Backport of [AArch64] Merge longlong.h from glibc tree.
* Backport of [AArch64] add, sub, mul in TImode.
* Backport of [AArch64] Add handling of bswap operations in rtx costs.
* Backport of [AArch64] Fully support rotate on logical operations.
* Backport of [AArch64] Use standard patterns for stack protection.
* Backport of [AArch64] VDUP Testcases.
* Backport of [AArch64] Vectorise bswap[16,32,64].
* Backport of [AArch64] Enable TBL for big-endian.
* Backport of [AArch64] Reverse TBL indices for big-endian.
* Backport of [AArch64] Relax modes_tieable_p and cannot_change_mode_class.
* Backport of [AArch64] Improve vst4_lane intrinsics.
* Backport of [AArch64] Rewrite and tests ZIP Intrinsics.
* Backport of [AArch64] libitm Enabled.
* Backport of [AArch64] Support full addressing modes for ldr/str in
vectorization scenarios
* Backport of [AArch32/AArch64] rtx costs (FMA, Cortex-A8, ...).
* Backport of Fix warning in libgfortran configure script.
* Backport of Remove PUSH_ARGS_REVERSED from the RTL expander
Feedback and Support
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 Launchpad against "Linaro GCC project":
http://bugs.launchpad.net/gcc-linaro/+filebug.
* Questions? "ask Linaro":
http://ask.linaro.org/.
* Interested in commercial support? inquire at "Linaro support":mailto:
support(a)linaro.org
[1] Stable source package releases are defined as releases where the full Linaro
Toolchain validation plan is executed.
[2] Engineering source package releases are defined as releases where the
compiler is only put through unit-testing and full validation is not
performed.
Sorry for sending this late this week.
== Progress ==
* Ran gdb testsuite on arm and x86. Investigated failures on
arm-native-gdbserver config. [2/10]
* Investigate shared library gdb test failures with dejagnu on remote
connections. [TCWG-504] [2/10]
* Debug AArch64 GDB reverse watchpoints issue. [TCWG-503] [2/10]
* Debug AArch64 GDB handling of functions with empty prologue. [TCWG-504] [2/10]
* Understand gdb remote vs native feature parity patches. [1/10] [TCWG-263]
* Miscellaneous [1/10]
-- Setting up chromebook with 14.04
-- Meetings etc.
== Plan ==
* Further progress on AArch64 GDB reverse watchpoints issue. [TCWG-503]
* Further progress on AArch64 GDB handling of functions with empty
prologue. [TCWG-504]
== Progress ==
* Track down and fix build, testing, and Jenkins issues. (TCWG - 1378
9/10)
- Reinstalled everything needed for toolchain build and Jenkins on
the repaired chromebooks.
- Setup D01 and APM boards for toolchain building and testing,
added them to the Jenkins matrix.
- Updated qemu to the latest to get aarch32 & crypto support.
* Meetings and Misc (1/10)
== Plan ==
* Fix bare metal testing for aarch64.
* Continue working with the D01 boards.
* Track down and fix build, testing, and Jenkins issues. (TCWG - 1378)
== Issues ==
* Gerrit triggers only build trunk, and not the branch specified
in the review request.
== Progress ==
* More work on malloc microbenchmark (5/10, TCWG-160)
- Script for plotting results
- Analyze performance with SystemTap probe points
- Tidy up and submit v3
* Further work on ld issue on master (1/10, CARD-341)
* Patch review and testing (2/10, CARD-341)
* Annual leave on Friday (2/10)
* Still no luck on getting Ubuntu on wg boards
== Issues ==
* None
== Plan ==
* Make sure we have everything we need for glibc freeze at month end
* malloc app benchmark work
--
Will Newton
Toolchain Working Group, Linaro
=Progress=
memcpy regression on A9 - TCWG-390 [6/10]
* cortex-strings benchmarks suggest this isn't just an outlier, nor
entirely about preload
* Quick test on A15 suggests a similar (less severe) issue
* Got cortex-strings benchmarks more-or-less running via lava
memset performance improvement - TCWG-156 [1/10]
* GNU benchtests not as repeatable as hoped
lowlevellock performance bugs - TCWG-435 [1/10]
* Converted a bunch of inline functions into macros for coldfire
Meetings/mail/etc [2/10]
=Plan=
Carry on generating memcpy data, develop some hypotheses
Bugfix lava-ization of cortex-strings benchmarks as & when
Explore repeatability of cortex-strings benchmark
See how much quicker I can make cortex-strings benchmark without
compromising repeatability
Try to get lowlevellock.h committed for at least arm/aarch64
== Progress ==
* TCWG-418 : Bug fix Reload spill failure (3/10)
Bench marked coremark – no degradations with patch.
CPU2000 runs – Workedon running them as native in chromebook.
Issues with space.
* TCWG-181 : LTO enablement (3/10)
GCC 4.9 FSF no ICE . Linaro 14.07 release has ICE.
GIT bisect experiments on trunk on Aarch64 hardware.
* Misc: (2/10)
- Various meetings .
- PGO bootstrap runs on Aarch64 hardware - pass.
* AMD team out on 19th (2/10).
== Next ==
* GIT bisect experiments on LTO bootstrap.
* Continue Benchmark reload spill failure fix
* Explore on Large memory model support for aarch64
* Cbuildv2 release packaging on native.
