The Linaro Toolchain Working Group is pleased to announce the release of
Linaro GDB 7.4 2012.06.
Linaro GDB 7.4 2012.06 is the third release in the 7.4 series. Based off
the latest GDB 7.4.1, it includes a number of bug fixes.
Interesting changes include:
* GDB now expands tildes in solib-search-path entries.
* Updated to the GDB 7.4.1 code base.
https://launchpad.net/gdb-linaro/+milestone/7.4-2012.06
More information on Linaro GDB is available at:
https://launchpad.net/gdb-linaro
--
[]'s
Thiago Jung Bauermann
Linaro Toolchain Working Group
The Linaro Toolchain Working Group is pleased to announce the 2012.06
release of both Linaro GCC 4.7 and Linaro GCC 4.6.
Linaro GCC 4.7 2012.06 is the third release in the 4.7 series. Based
off the latest GCC 4.7.0+svn188038 release, it includes performance
improvements especially around 64 bit operations.
Interesting changes include:
* Updates to GCC 4.7.0+svn188038
* Adds multilib support for use in the binary builds
* Improves performance of 64 bit shifts in core registers
Fixes:
* LP: #949805 GCC doesn't by default use %gnu_unique_object
* LP: #990530 internal compiler error: in convert, at lto/lto-lang.c:1292
* An off-by-one error in vrev
Linaro GCC 4.6 2012.06 is the sixteenth release in the 4.6 series.
Based off the latest GCC 4.6.3+svn188320 release, this is the third
release after entering maintenance.
Interesting changes include:
* Updates to 4.6.3+svn188320
* Uses the new /lib/ld-linux-armhf.so.3 loader for hard float binaries
Fixes:
* LP: #949805 GCC doesn't by default use %gnu_unique_object
* LP: #990530 internal compiler error: in convert, at lto/lto-lang.c:1292
The source tarballs are available from:
https://launchpad.net/gcc-linaro/+milestone/4.7-2012.06https://launchpad.net/gcc-linaro/+milestone/4.6-2012.06
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/4.7/4.7-2012.06
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
On 12 June 2012 18:53, Akash D <akashd(a)renuelectronics.com> wrote:
> Hello Michael,
>
> Thanks for reply.
>
> The required information is mentioned below.
>
> Compiler Used --->
>
> http://launchpad.net/gcc-arm-embedded
>
> Version number ---->
>
> arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 4.6.2 20110921
> (release) [ARM/embedded-4_6-branch revision 182083]
Yip, this is ARM's Cortex-R & M bare metal toolchain. It doesn't come
directly from Linaro but we've got a good relationship with them.
I'll ping them and see the best place to ask this question.
> The link file is attached with this mail.
I only had a quick read, but you're missing a capture for the
'.text.startup' section in the linker script. You might need
something like:
*(.text.startup)
before the one.o(.text) line or to change the *(.text) capture to
*(.text*). The startup section might need to be at a fixed address.
Please check your chip and toolchain documentation to confirm.
-- Michael
While benchmarking the auto-vectoriser on Libav, I noticed a performance
regression in gcc 4.7 (both FSF and Linaro) compared to gcc 4.6 in the AAC
decoder. I narrowed it down to this function:
static void ps_hybrid_analysis_ileave_c(float (*out)[32][2],
float L[2][38][64],
int i, int len)
{
int j;
for (; i < 64; i++) {
for (j = 0; j < len; j++) {
out[i][j][0] = L[0][j][i];
out[i][j][1] = L[1][j][i];
}
}
}
While gcc 4.6 does not attempt to vectorise this at all, 4.7 goes crazy
with a massive slowdown, about 20x slower than non-vectorised with Linaro
4.7 and much worse with FSF 4.7.
Let me know if you need more information.
--
Mans Rullgard / mru
== Progress ==
* Connect last week.
* Worked through the open issues and open work items related to
performance and we've got a clear list of things that are currently in
flight. Now to keep track of this better.
https://wiki.linaro.org/RamanaRadhakrishnan/Sandbox//RRQ212ConnectNotes
and move this away from the wiki page in a form that we can use to
talk during our regular performance meetings.
* Created blueprints, closed down old issues and reprioritized
issues with Ulrich and others.
* A number of interesting conversations during Connect for a number
of compiler related issues.
* Other sessions that I attended included the Android optimizations
sessions - while there was quite a bit about toolchain performance it
is important that we keep looking out for the performance profiles and
find areas where the toolchain can be improved. However this can't be
done without getting more testcases from other groups. There were a
couple of interesting comments made that skia is CPU bound which would
indicate that the paint function is CPU bound. But why and how ?
Someone should look at reproducing these numbers and see where we get
to in this area. Pointed out that cortex-strings might be good to make
it into bionic ?
* Fixed the vrev off by one error and committed to FSF trunk .
However it couldn't make it in time for FSF 4.7.1 as the merge window
had closed by then.
* Set up my panda board to be identical to what runs on our
validation labs etc.
* This week
* Worked through the merge requests and moved some patches
upstream away from the "toreview" state.
* Landed a few merge requests that were approved but hadn't been
done so. Took care of merging the upstream 4.7 branch.
* Given I only had a few hours back in the office this week I
worked on regenerating arm_neon.h to use __builtin_shuffle with
vrev64, vrev32, vtrn , vzip and vuzp. A follow up patch needs to do
the same for vext but that needs generic support also in
vec_perm_const_ok .Once that is done I think we can safely start
rewriting . It still needs some more testing and polishing up but the
initial results on the testcase from PR48941 is kind of neat. The
result for some of the other testcases that I've looked at also looks
much better than where we were a few weeks back. So all in all nice
progress on that front. However we have to also find a way of getting
these generated at O0 which they don't appear to do so cleanly enough
with this approach.
for one example it does look like this below: Notice those spills
beginning to disappear .... :)
New :
sqrlen4D_16u8:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
vabd.u8 q1, q0, q1
vmull.u8 q0, d2, d2
vmull.u8 q8, d3, d3
vuzp.32 q0, q8
vpaddl.u16 q0, q0
vpadal.u16 q0, q8
bx lr
Old :
sqrlen4D_16u8:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
@ link register save eliminated.
vabd.u8 q1, q0, q1
stmfd sp!, {r4, fp}
add fp, sp, #4
sub sp, sp, #48
add r3, sp, #15
vmull.u8 q0, d2, d2
bic r3, r3, #15
vmull.u8 q8, d3, d3
vuzp.32 q0, q8
vstmia r3, {d0-d1}
vstr d16, [r3, #16]
vstr d17, [r3, #24]
vpaddl.u16 q0, q0
vpadal.u16 q0, q8
sub sp, fp, #4
ldmfd sp!, {r4, fp}
bx lr
* Attended platform / WG sync-up.
== Plans ==
* Cleanup the ml bits of rewiring the intrinsics and try some proper testcases.
* Work on the auto-inc-dec scheduler patches.
* Rework the sched-pressure patch upstream .
* Review the Android benchmarking writeups.
Summary:
* Bug fixes.
* Tune ivopt for code size.
Details:
1. Reproduce lp:1007353 "kernel build fails with 12.04 and 12.05
toolchain released" and workout a patch to fix it; reopen the related
binutils/gas bug http://sourceware.org/bugzilla/show_bug.cgi?id=12698
and propose the patch to it; push the patch to linaro crosstool-ng to
make sure lp:1007353 is fixed for next binary toolchain release.
2. Setup the SPEC build env and reproduce lp: 886124 "using LDR from
literal pool rather than MOVW/MOVT". After cprop1 replaces lo_sum
(high: symbol_ref bloc) (symbol_ref (block)) with a (symbol_ref
(block)), no later optimization can split it. The solution in linaro
4.5 is to add a split (porting from codesourcery) in arm.md. Then
split1 can split the (symbol_ref (block)). The split is:
(define_split
[(set (match_operand:SI 0 "arm_general_register_operand" "")
(match_operand:SI 1 "general_operand" ""))]
"TARGET_32BIT
&& TARGET_USE_MOVT && GET_CODE (operands[1]) == SYMBOL_REF
&& !flag_pic && !target_word_relocations
&& !arm_tls_referenced_p (operands[1])"
[(clobber (const_int 0))]
{
arm_emit_movpair (operands[0], operands[1]);
DONE;
})
3. Tune ivopt for code size. Try to set avg_loop_niter to 1 since loop
iterator number does not impact code size. But test shows there is no
improvement. Need more tuning.
Plans:
* Analyze the failed cases in arm-linux-gnueabihf regression test.
* Tune code size for M0.
Best regards!
-Zhenqiang
Hello Sir/Madam,
I am using MK60FN1M0VLQ12 (COTREX-M4) processor for my development.
I am using float and double data types in my code. When I perform any
mathematical operation on these variables, the processor goes to Hard Fault
Exception.
Earlier I have used GCC 4.5.2 compiler for my compilation
So now I am using Linaro's GNU-GCC Toolchain 4.6.2 for compiling my code
with following command.
arm-none-eabi-gcc -Wall -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -mcpu=cortex-m4
-mthumb -Qn -Os -mlong-calls -c main.c -o main.o
But I am getting following error while linking my code
ld: section .text.startup loaded at [00032258,000331cb] overlaps section
.InitializedVariables loaded at [00032258,00032787]
The link file is attached with this mail.
Can you please suggest me some solution for this problem.
Can you also suggest some compiler commands to support float and double data
type using software.
Awaiting for your reply,
Thanks & Regards,
Akash
== GCC ==
* Worked on reimplementing reassociation pass based on
review comments I had received.
* Identified root cause and worked on fix for vectorizer
bug causing unaligned memory accesses (reported by Mans).
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
Hi,
OpenEmbedded-Core/meta-linaro:
* fixed the binary toolchain support on master (still 2012.03)
* fixed armhf support for Linaro GCC 4.6 on master
* backport of Linaro GCC 4.7 r114985
* tested the images using QEMU - no failures
* now the master branch supports building images for ARM, MIPS, PPC,
X86 and X86_64 using the latest (2012.05) releases of Linaro GCC
4.6 or 4.7
* add tags on meta-linaro to easily find the revision for a particular
Linaro GCC
* changed cbuild to pull in the master branches of OE-Core and
meta-linaro
* merged the branch that allows to build OpenEmbedded-Core using cbuild
http://bazaar.launchpad.net/~kwerner/cbuild/oecore/changes/
* updated docs on the wiki
Misc:
* public holiday on Thu, vacation on Fri
* I'll be back on Monday : )
Regards,
Ken
