Hi,
GDB for Android:
* Investigated .note.ABI-tag generation in glibc and FreeBSD.
Wrote crtbrand.c for bionic based on FreeBSD's crtbrand.c.
Tried to integrate it with bionic's build system.
* Contacted Google engineers about adding .note.ABI-tag to Android
binaries.
2012.04 release:
* Started working on the release. Applied the latest patches from
the FSF 7.4 branch to gdb-linaro/7.4 and also my patches to compile
gdbserver with the Android toolchain.
--
[]'s
Thiago Jung Bauermann
Linaro Toolchain Working Group
* Linaro GCC
Spun release tarballs for Linaro GCC 4.6 and 4.7. Pushed them to
Michael's servers and launched the testing.
Continued trying to get the 64-bit NEON stuff to work. The negdi2 patch
needed some reworking following upstream review, and the extend patch
has mysteriously reintroduced a performance regression when the
operation is done in core-registers, which needs to be solved, but the
other patches seem ok at the moment, although the shift stuff is blocked
on benchmarking.
I've begun looking at how my changes affect spec2000, and whether the
register allocation could be done better. Unfortunately, given that the
test systems are currently giving spec results with a low level of
consistency (and therefore confidence), this has mostly been by visual
inspection, so far.
* Other
Public Holiday on Monday.
I have a cross toolchain I configured with "--with-arch=armv7-a --with-cpu=cortex-a9 --with-tune=cortex-a9" and I want the linker to emit armv4t compatible thumb interworking, but I can't seem to get it to.
I noticed that if I create a armv4t toolchain with "--with-arch=armv4t --with-cpu=arm7tdmi --with-tune=arm7tdmi" and then I pass "--use-blx" to the linker it will emit armv7 thumb interworking. There doesn't seem to be any inverse "--no-use-blx" type switch though. Is this a bug/limitation of the linker or am I misunderstanding something?
-Allen
nvpublic
Current Milestones:
|| || Planned || Estimate || Actual ||
||cp15-rework || 2012-01-06 || 2012-04-10 || ||
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 ==
* completed last of the register conversions, started on the final
check-through and polish before it goes out to the mailing list
* implemented changes following review of the clean-up-reset patchset
== other ==
* qemu-linaro 2012.04 final testing (confirming an audio issue on
the vexpress model LP:977610 wasn't a regresion) and release
* patch review: pl330 dma controller model
* patch review: samsung's sd card model overhaul
* minor patch: fix compile failure on bsd
* minor patch: fix failure to reset timer on a9 mptimer reset
* minor patch: diagnose attempts to use python3 at configure time
* sent arm-devs.next pullreq
* put together a bug report in the form of a youtube video (!) as
requested by the gmail folks
-- PMM
== GCC ==
* Committed fix for LP #968766 (PR tree-optimization/52880)
to FSF mainline and Linaro GCC 4.6 and 4.7.
* Created merge reqest to fix LP #972648 for Linaro GCC 4.6
by backporting mainline patch; pending approval.
* Updated patch to use vld1.64/vst1.64 instead of vldm/vstm
for vector moves. Testing detected problems in GCC core
memory alignment logic (GCC assumes vector types are
naturally aligned, which contradicts ARM ABI and ARM
back-end assumptions). Started discussion on possible
fixes.
* Updated and retested patch to use vld1/vst1 to implement
vec_set/vec_extract for cases where the scalar operand
resides in memory.
* Ongoing work on fixing LP #959242.
* 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
The Linaro Toolchain Working Group is pleased to announce the release of
Linaro GDB 7.4 2012.04.
Linaro GDB 7.4 2012.04 is the second release in the 7.4 series. Based
off
the latest GDB 7.4, it includes a number of ARM-focused bug fixes and
enhancements.
Interesting changes include:
* gdbserver can now be compiled with Android's toolchain.
* Additional fixes from the GDB 7.4 branch, one of them being
that it doesn't require makeinfo to build anymore.
The source tarball is available at:
https://launchpad.net/gdb-linaro/+milestone/7.4-2012.04
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 release of
Linaro QEMU 2012.04.
Linaro QEMU 2012.04 is the latest monthly release of qemu-linaro. Based
off upstream (trunk) QEMU, it includes a number of ARM-focused bug fixes
and enhancements.
New in this month's release:
- ppoll syscall now supported in ARM linux-user mode
- the SETEND instruction in the Thumb encoding now UNDEFs to
match behaviour for the ARM encoding
- the OMAP36xx UART FIFO status registers are now implemented
(thanks to Jan Vesely)
Known issues:
- Graphics do not work for OMAP3 based models (beagle, overo)
with 11.10 Linaro images.
- Audio may not work on Versatile Express models with the latest
Linaro kernel/hardware packs (LP:977610).
The source tarball is available at:
https://launchpad.net/qemu-linaro/+milestone/2012.03
More information on Linaro QEMU is available at:
https://launchpad.net/qemu-linaro
The Linaro Toolchain Working Group is pleased to announce the 2012.04
release of both Linaro GCC 4.7 and Linaro GCC 4.6.
Linaro GCC 4.7 2012.04 is the first release in the 4.7 series. Based
off the latest GCC 4.7.0+svn186061 release, it includes performance
improvements especially around 64 bit operations.
Interesting changes include:
* Our first 4.7 based release
* Updates to GCC 4.7.0+svn186061
* Better use of 16 bit Thumb-2 instructions for smaller code size
* Implements 64 bit ones complement in NEON
* Adds support for the ARMv6 saturation instructions
* Backports the NEON lexer improvements for faster compilation
* Backports the 64 bit multiply, divide, and mod improvements
Fixes:
* LP: #960283 slp pass assert when compiler configure with --enable-checking
Linaro GCC 4.6 2012.04 is the fourteenth release in the 4.6 series.
Based off the latest GCC 4.6.3+svn186060 release, this is the first
release after entering maintenance.
Interesting changes include:
* Updates to 4.6.3+svn186060
Fixes:
* LP: #960283 slp pass assert when compiler configure with --enable-checking
The source tarballs are available from:
https://launchpad.net/gcc-linaro/+milestone/4.7-2012.04https://launchpad.net/gcc-linaro/+milestone/4.6-2012.04
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/4.7/4.7-2012.04
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
All,
In the below code, I tried few compiler options and got following observations:
1) arm-linux-gnueabi-gcc -O2 -mcpu=cortex-a15 -mfpu=neon -ftree-vectorizer-verbose=6 -ftree-vectorize
Compiler throws following info messages:
foo.c:16: note: not vectorized: unsupported use in stmt.
foo.c:16: note: not vectorized: unsupported use in stmt.
foo.c:18: note: not vectorized: unsupported use in stmt.
foo.c:18: note: not vectorized: unsupported use in stmt.
2) -O2 -mcpu=cortex-a15 -mfpu=neon
None of the generated code contains the NEON instructions. Code generated with case 1 is taking 3000 cycles, and code generated by option 2 is taking 2500 cycles.
Even if vectorization failed in case1, it should not generate more inefficient code than case 2. My belief was that the executables from both would take same cycles, any thing done for doing unsuccessful vectorization must be reverted if it did not succeed.
###################################################################
#define SIZE1 20
#define SIZE2 26
unsigned int array[SIZE1][SIZE2];
void foo()
{
unsigned int i,j;
unsigned int max = 0;
for(i = 0; i < SIZE1; i++)
{
for(j = 0; j < SIZE2; j++)
{
if (array[i][j] > max)
{
max = array[i][j];
index = j;
}
}
}
printf("Max value: %u Index: %u\n", max, index);
}
Regards
RKS
