* Linaro
Continued looking at the lower-subreg problem (that the lowering is only
really intended for 32-bit targets that don't have 64-bit operation).
Without NEON this is only really a problem for "ldrd/strd" 64-bit loads
and stores: the patterns are all (or should be all) written such that
they only access DImode regs via SUBREG, so it all works well. When
adding NEON 64-bit this becomes less clear: many operations must remain
in DImode without SUBREG until after register allocation. The
lower-subreg passes mostly cope with this well enough, but it has some
features that attempt to lower zero_extends, certain shifts, and
pseudo-reg copies, unconditionally. I've been investigating what happens
if I disable the pseudo-reg copy "optimization" in the first
lower-subreg pass. As I expected, in many cases it actually leads to
smaller code (more use of LDRD/STRD) without NEON, and even better
results with NEON. Unfortunately I have found so counter-examples, so
I'm trying to figure out what's going on there: for some reason reload
goes crazy and starts spilling things to the stack, even though I can't
see that more registers are required. More investigation required.
Richard E approved my NEON-immediates patch for upstream. I don't have
time to commit it with proper care this week, so that's delayed to next
week.
* Other
Vacation Monday and Tuesday. Had a fun long weekend in Cornwall with my
family.
Progress
Away last week - nothing to report. Will be in BST + 4:30 timezone
this week.
Plans
* Finish off the VFP addressing modes patch.
* Follow up on iterations idiom patch upstream
* Pursue backporting gnu_unique_object upstream.
* Look at some of the existing blueprints and start discussions around
prioritizing this.
* Investigate some of the SEGVs with h-c partitioning in the future.
Hi Zhenqiang. Ubuntu Precise is now out and has switched to hard
float by default. I want to do the same for the next binaries
release. Here's the work that needs to be done:
* Bring in the new sysroot
* Change the triplet to arm-linux-gnueabihf
* Change GCC's configure so it recognises the new triplet
* Change the default float ABI to hard
We should include a soft float (not softfp) multlib libgcc for those
who use the binary toolchain to build bare metal programs like u-boot
or the kernel. They don't use floating point, but the linker will
complain about mixed calling conventions.
I've updated make-sysroot.sh and spun an experimental sysroot at
http://people.linaro.org/~michaelh/incoming/precise-sysroot-armhf-r0.tar.bz2.
Hopefully we'll use Marcin's ones instead.
Matthias has patches for many of these changes. Let's talk about it
at tonight's meeting.
Could you start on these? I'd like the changes done within two weeks
so we have plenty of time to test.
-- Michael
Summary:
* Linaro binary toolchain 2012.04 release.
* Code size benchmark analysis.
Details:
1. Validate and bug fix for linaro binary toolchain 2012.04 release.
2. Investigate code size regressions in 4.7
Find more regression cases due to loop invariant hoisting, and tests
should we can reduce some codesize with option
-fno-move-loop-invariants. Some regressions are due to
pass_reorder_blocks, which is disabled for -Os in 4.7. For some cases,
ivopt will introduce to more codes and function inline might lead to
more spilling. We also try linaro 2012.04 baremetal build. But there
is a few bytes regression compared with 4.7 trunk.
3. Setup the qemu env following Michael’s instructions
(https://wiki.linaro.org/MichaelHope/Sandbox/QEMUCrossTest) and tests
show it work.
4. Try to build gcc-linaro-2012.04 configured with "--with-fpu=neon
--with-float=hard" based on a precise sysroot
(precise-sysroot-armhf-r0.tar.bz2) from
http://people.linaro.org/~michaelh/incoming
* Linux build is OK without any change.
* Mingw32 build reports error. After removing the code, the build PASS.
[ERROR] .../libc/usr/include/arm-linux-gnueabihf/sys/types.h:117:19:
error: two or more data types in declaration specifiers
Plans:
* Investigate other code size regressions in 4.7.
Planed leaves:
* Labor Day holiday: April 30 and May 1.
Best regards!
-Zhenqiang
Hi,
OpenEmbedded-Core/meta-linaro:
* pushed support for Linaro GCC 4.6.4 2012.04 and for the
2012.03-20120326 binary toolchain
* updated the wiki
* created a branch to support GCC 4.7
* built several images using several GCC 4.7 based toolchains (OE,
linaro 4.7.1, binary toolchain 2012-04)
* minimal images are working
* sato image shows splash screen forever (won't bring up the
matchbox window manager)
* only when using the binary toolchain 2012-04 ? -> needs to be
analyzed
* Qt 4.8 requires small patches (posted and merged into
oe-core/master-next)
Libunwind:
* User reports issues when backtracing through signal frame
* reason: the lib falls back on APCS frame parsing which usually
segfaults on EABI systems
* provided debugging hints and insights on how libunwind handles
signal frames
* posted a reduced testcase
Regards,
Ken
== GCC ==
* Fixed regression (ICE when building EEMBC) with patch to use vld1/vstd1
instead of vldm/vstdm for vector moves. Updated merge request and
restarted testing.
* Implemented patch to fix LP #959242; backported to Linaro GCC 4.7 and
created merge request for regression testing and benchmarking.
* Ongoing discussions on -fsched-pressure; worked on patch to enable it
by default on s390.
* Ongoing work on improving end-of-loop value computation.
Mit freundlichen Gruessen / Best Regards
Ulrich Weigand
--
Dr. Ulrich Weigand | Phone: +49-7031/16-3727
STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E.
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk
Wittkopp
Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht
Stuttgart, HRB 243294
Current Milestones:
|| || Planned || Estimate || Actual ||
||cp15-rework || 2012-01-06 || 2012-06-23 || ||
Historical Milestones:
||initial-a15-system-model || 2012-01-27 || 2012-01-27 || 2012-01-17 ||
||qemu-kvm-getting-started || 2012-03-04?|| 2012-03-04 || 2012-02-01 ||
== cp15-rework ==
* have had no review feedback on this patchset yet, and we're now
into QEMU 1.1 hardfreeze. I'm hoping to get review during the
month we're in freeze and then commit early June when 1.2 opens.
However since that coincides with me being on holiday I've set the
Estimate date to allow for that plus a week or so of buffer.
Actual further work required is probably 1 week max, most of this
is waiting-for-other-people or being-away.
== kvm-boot-wrapper ==
* pushed dtb support changes to git repo
== other ==
* basic QEMU side support for the VGIC kernel implementation
Marc Z has been working on. I have something that seems to
work but it's still a bit prototype and missing features.
* investigated why my guest kernel was causing kvm to exit:
turns out that we haven't implemented the kernel support for
gracefully not using KVM if not booted in hyp mode, so trying
to boot a KVM-aware kernel as a KVM guest doesn't work yet.
* sent off the final few patches which I want in QEMU 1.1 before
hardfreeze at the start of next week
* tested a beagle board linaro snapshot image (it panics on
bootup, LP:989737)
* trying to clarify the KVM todo list...
-- PMM
Greetings,
I successfully built and booted Linux 3.1 for the beaglebone (TI am335x) using the 4.5.2 toolchain. I rebuild the same kernel using the same config with the 4.6.3 toolchain, but the board hangs at "Uncompressing Linux... done, booting the kernel."
I halt the beaglebone at the U-Boot prompt and have it download and run uImage from an NFS mounted RFS.
The Linaro 4.5.2 toolchain was installed in my Ubuntu 11.04 distro using aptitude.
The Linaro 4.6.3 toolchain binaries, downloaded via Launchpad, were installed into my own tools directory.
4.5.2 INFO:
./gcc-linaro-arm-linux-gnueabi-2012.01-20120125_linux/bin/arm-linux-gnueabi-gcc --version arm-linux-gnueabi-gcc (crosstool-NG linaro-1.13.1-2012.01-20120125 - Linaro GCC 2012.01) 4.6.3 20120105 (prerelease) Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Built with: $ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- uImage
4.6.3 INFO:
./bin/arm-linux-gnueabi-gcc --version arm-linux-gnueabi-gcc (crosstool-NG linaro-1.13.1-2012.01-20120125 - Linaro GCC 2012.01) 4.6.3 20120105 (prerelease) Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Built with: $ make ARCH=arm CROSS_COMPILE=<mytoolsdir>/gcc-linaro-arm-linux-gnueabi-2012.01-20120125_linux/bin/arm-linux-gnueabi- uImage
Could it have anything to do with my binutils and/or U-Boot version? Any debugging tips?
U-Boot INFO:
U-Boot# version
U-Boot 2011.09-00010-g81c8c79 (Feb 13 2012 - 14:48:03) arm-angstrom-linux-gnueabi-gcc (GCC) 4.5.4 20111126 (prerelease) GNU ld (GNU Binutils) 2.20.1.20100303
Thanks for reading this far.
We use QEMU to test programs built by the toolchain binary release for
correctness. I've written up the instructions for spinning up your
own at:
https://wiki.linaro.org/MichaelHope/Sandbox/QEMUCrossTest
It's focused on simplicity - getting a running, SSH only Cortex-A9 up
and going as soon as possible. It's not the latest, not graphical,
and doesn't replace the deeper documentation at:
https://wiki.linaro.org/Resources/HowTo/Qemu
-- Michael
The Linaro Toolchain Working Group is pleased to announce the 2012.04
release of the Linaro Toolchain Binaries, a pre-built version of
Linaro GCC and Linaro GDB that runs on generic Linux or Windows and
targets the glibc Linaro Evaluation Build.
Uses include:
* Cross compiling ARM applications from your laptop
* Remote debugging
* Build the Linux kernel for your board
What's included:
* Linaro GCC 4.7 2012.04
* Linaro GDB 7.4 2012.04
* A statically linked gdbserver
* A system root
* Manuals under share/doc/
The system root contains the basic header files and libraries to link
your programs against.
Interesting changes include:
* Switches to the new GCC 4.7 based Linaro GCC
* Adds native language support to most of the programs
* Adds the mudflap, ssp, and gomp runtime libraries
* Enables gnu_unique_object support in GCC
Please see the README about running 4.7 based programs on a system
with 4.6 based runtime libraries.
The Linux version is supported on Ubuntu 10.04.3 and 11.10, Debian
6.0.2, Fedora 16, openSUSE 12.1, Red Hat Enterprise Linux Workstation
5.7 and later, and should run on any Linux Standard Base 3.0
compatible distribution. Please see the README about running on
x86_64 hosts.
The Windows version is supported on Windows XP Pro SP3, Windows Vista
Business SP2, and Windows 7 Pro SP1.
The binaries and build scripts are available from:
https://launchpad.net/linaro-toolchain-binaries/trunk/20yy.mm
Need help? Ask a question on https://ask.linaro.org/
Already on Launchpad? Submit a bug at
https://bugs.launchpad.net/linaro-toolchain-binaries
On IRC? See us on #linaro on Freenode.
Other ways that you can contact us or get involved are listed at
https://wiki.linaro.org/GettingInvolved.
-- Michael
