The Linaro Toolchain Working Group is pleased to announce the 2011.09
release of both Linaro GCC 4.6 and Linaro GCC 4.5.
Linaro GCC 4.6 2011.09-1 is the seventh release in the 4.6 series. Based
off the latest GCC 4.6.1+svn178681, it contains a range of vectoriser
and core performance improvements as well as fixing a number of
bugs.
Interesting changes include:
* Updates to 4.6.1+svn178681
* Improves performance by making better use of conditional compares
* Improves performance by properly scheduling widening multiplies
* Improves size and speed by improving constant generation in Thumb-2
* Implements support for widening multiples in toe core
* Improves vectorised code by reducing the over-promotion of intermediates
* Improves performance by reducing redundant moves between VFP and ARM
* Finishes off supporting the Android team in integrating Linaro GCC
Fixes:
* LP: #823548 Can't use -flto with skia
* LP: #823711 libvirt version 0.9.2-4ubuntu8 failed to build on armel
* LP: #827990 internal compiler error: in decode_addr_const, at varasm.c:2632
* LP: #836401 ICE on a | (b << negative-constant)
* LP: #838994 ICE building perl w/ -marm
* LP: #843775 ICE optimizing widening multiply-and-accumulate
Linaro GCC 4.5 2011.09 is the fourteenth release in the 4.5
series. Based off the latest GCC 4.5.3+svn178560, this is a
maintenance focused release.
Interesting changes in 4.5 include:
* Updates to 4.5.3+svn178560
Fixes:
* LP: #823711 libvirt version 0.9.2-4ubuntu8 failed to build on armel
The source tarballs are available from:
https://launchpad.net/gcc-linaro/+milestone/4.6-2011.09https://launchpad.net/gcc-linaro/+milestone/4.5-2011.09
Downloads are available from the Linaro GCC page on Launchpad:
https://launchpad.net/gcc-linaro
More information on the features and issues are available from the
release page:
https://launchpad.net/gcc-linaro/4.6/4.6-2011.09https://launchpad.net/gcc-linaro/4.5/4.5-2011.09
Mailing list: http://lists.linaro.org/mailman/listinfo/linaro-toolchain
Bugs: https://bugs.launchpad.net/gcc-linaro/
Questions? https://ask.linaro.org/
Interested in commercial support? inquire at support(a)linaro.org
-- Michael
I tried to bootstrap current GCC trunk and our latest gcc-linaro-4.6
in profile guided, link time optimisation, and SMS modes. The results
are here:
https://wiki.linaro.org/MichaelHope/Sandbox/PGOLTOSMSStatus1
Short story: you can't bootstrap in LTO or PGO on ARM as they run out
of memory. i686 LTO is broken on trunk and gcc-linaro-4.6. SMS is
fine in general.
I'll run these once a week and keep an eye on them. A -fwhopr instead
of -flto may help on ARM. I don't know why the PGO build runs out of
memory.
-- Michael
Måns pointed me at the IDCT throughput test that's included with
libav. I've written up a page on how to build and run it at:
https://wiki.linaro.org/MichaelHope/Sandbox/LibAvDCT
Included are results with and without the vectoriser. In all cases
the vectoriser improves things, including increasing the SIMPLE-C
version by 11 % and the peak by 17 %.
The coefficient of variance is low so the results are consistent. I
haven't investigated the benchmark itself to see if its valid - we
could be vectorising the loop overhead instead of the IDCT itself.
-- Michael
Please coordinate with Jon Masters at RedHat/Fedora and Adam Conrad at
Ubuntu/Debian on this. (Cc'ing the cross-distro list, through which the
recent ARM summit at Linux Plumbers was organized.)
Cheers,
- Michael
On Sep 16, 2011 8:41 AM, "David Gilbert" <david.gilbert(a)linaro.org> wrote:
> OK, so we seem to have agreement here that what we want is autodetect
> for eglibc and
> forget about the triplet; well technically that probably makes my life
> easier, and I don't
> think it's too hard a sell.
>
> Dave
>
> _______________________________________________
> linaro-toolchain mailing list
> linaro-toolchain(a)lists.linaro.org
> http://lists.linaro.org/mailman/listinfo/linaro-toolchain
* Linaro GCC
Spun 4.5 and 4.6 2011.09 GCC release tarballs. Uploaded them to
Michael's server, and kicked off the tests.
Continued work on my new constant optimization experiments. I now have
it tracking all the constants and am looking at how to detect the
optimization opportunities. So far it only calculates how exprensive it
would be to generate a value by adding to an existing constant, which is
a start at least. I'm having difficulties detecting whether changing an
insn will make it's parent (dependency-wise) obsolete, or not (and
therefore whether to count its costs - there's no problem for
instructions that overwrite an entire register, but ones that write to
portions of registers (such as MOVT) make more complex dependency
chains, and the def-use chains don't seem to be sorted into the order of
use.
* Other
Half day vacation on Thursday.
* Added testcases to Richard's micro benchmarks taken from libav.
* Discussed with Ayal the new version of the patch to support
instructions with
REG_INC_NOTE in SMS which causes bootstrap failure. I intend to debug
the bootstrap failure in order to find the cause for it.
(http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html)
== String routines ==
* Tidying up bits of cortex strings for the release process
* Nailing down the behaviour of config.sub and the config systems in
gcc, binutils and eglibc
== Other ==
* A discussion on synchronisation primitives on various CPUs that
started on the gcc list
- looking at http://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html
- pointing out the 64bit instructions
- asking why they used isb's when neither the kernel or gcc use
them (answer the DMBs should
be fine as well, but there is some debate over which is
quicker, oh and DMBs are
converted to slower dsb's on most A9s due to an errata).
* Looking for docs on the non-core bits of current SoCs
* Extracting some denbench stats from a few months back for Ramana
About a day of non-Linaro IBM stuff.
Dave
RAG:
Red:
Amber:
Green:
NB: since qemu-linaro releases demonstrably go out on schedule
every month I'm dropping them from the milestone tables in these
reports, in favour of blueprint completion dates (usually they'll
be planned for dates coinciding with a qemu-linaro release).
Current Milestones:
|| || Planned || Estimate || Actual ||
||add-omap3-networking || 2011-10-13 || 2011-10-13 || ||
||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || ||
||a15-usermode-support || 2011-11-10 || 2011-11-10 || ||
||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || ||
Historical Milestones:
||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 ||
||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 ||
||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 ||
||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || 2011-09-15 ||
== linaro-qemu-11.11 ==
* completed this month's release
== add-omap3-networking ==
* investigated why qemu's usb-net model didn't work on the beagle;
this was due to a bug in the usb-ohci controller model; patches
sent upstream. Fix will go into qemu-linaro 2011-10.
== a15-system-mode-planning ==
* wrote up options and my suggestion on the wiki:
https://wiki.linaro.org/PeterMaydell/QemuA15
* just need to discuss with Michael and turn this into a roadmap entry
== a15-usermode-support ==
* complete but untested implementation of UDIV and SDIV
* fused multiply-accumulate: implemented decode, and the special-cases
parts of the softfloat implementation (NaN, inf, etc); the difficult
bit of actually implementing the operation remains
== other ==
* meetings: toolchain, pdsw doughnuts, AFDS
Current qemu patch status is tracked here:
https://wiki.linaro.org/PeterMaydell/QemuPatchStatus
Absences (to end of year):
Sep 19, Sep 29-Oct 07, Oct 17, Nov 21, Dec 15-Jan 03: leave
Oct 30-Nov 04: Linaro Connect Q4.11
